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Since: 1.2 See Also:Comparable, Serializable Method Summary int compare(T o1, T o2) Compares its two arguments for order. boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. Method Detail compare int compare(T o1, T o2) Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive. The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.) The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator. equals boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. This method must obey the general contract of Object.equals(Object). Additionally, this method can return true only if the specified object is also a comparator and it imposes the same ordering as this comparator. Thus, comp1.equals(comp2) implies that sgn(comp1.compare(o1, o2))==sgn(comp2.compare(o1, o2)) for every object reference o1 and o2. Note that it is always safe not to override Object.equals(Object). However, overriding this method may, in some cases, improve performance by allowing programs to determine that two distinct comparators impose the same order. Overrides:equals in class Object Parameters:obj - the reference object with which to compare. Returns:true only if the specified object is also a comparator and it imposes the same ordering as this comparator.See Also:Object.equals(Object), Object.hashCode() Overview Package Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 6 PREV CLASS NEXT CLASS FRAMES NO FRAMES All Classes SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2015, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy. Scripting on this page tracks web page traffic, but does not change the content in any way.

Note that it is always safe not to override Object.equals(Object). However, overriding this method may, in some cases, improve performance by allowing programs to determine that two distinct comparators impose the same order. Overrides:equals in class Object Parameters:obj - the reference object with which to compare. Returns:true only if the specified object is also a comparator and it imposes the same ordering as this comparator.See Also:Object.equals(Object), Object.hashCode()

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For the mathematically inclined, the relation that defines the imposed ordering that a given comparator c imposes on a given set of objects S is: {(x, y) such that c.compare(x, y) <= 0}. The quotient for this total order is: {(x, y) such that c.compare(x, y) == 0}. It follows immediately from the contract for compare that the quotient is an equivalence relation on S, and that the imposed ordering is a total order on S. When we say that the ordering imposed by c on S is consistent with equals, we mean that the quotient for the ordering is the equivalence relation defined by the objects' equals(Object) method(s): {(x, y) such that x.equals(y)}. This interface is a member of the Java Collections Framework. Since: 1.2 See Also:Comparable, Serializable Method Summary int compare(T o1, T o2) Compares its two arguments for order. boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. Method Detail compare int compare(T o1, T o2) Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive. The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.) The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator. equals boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. This method must obey the general contract of Object.equals(Object). Additionally, this method can return true only if the specified object is also a comparator and it imposes the same ordering as this comparator. Thus, comp1.equals(comp2) implies that sgn(comp1.compare(o1, o2))==sgn(comp2.compare(o1, o2)) for every object reference o1 and o2. Note that it is always safe not to override Object.equals(Object). However, overriding this method may, in some cases, improve performance by allowing programs to determine that two distinct comparators impose the same order. Overrides:equals in class Object Parameters:obj - the reference object with which to compare. Returns:true only if the specified object is also a comparator and it imposes the same ordering as this comparator.See Also:Object.equals(Object), Object.hashCode() Overview Package Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 6 PREV CLASS NEXT CLASS FRAMES NO FRAMES All Classes SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2015, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy. Scripting on this page tracks web page traffic, but does not change the content in any way.

The ordering imposed by a comparator c on a set of elements S is said to be consistent with equals if and only if c.compare(e1, e2)==0 has the same boolean value as e1.equals(e2) for every e1 and e2 in S. Caution should be exercised when using a comparator capable of imposing an ordering inconsistent with equals to order a sorted set (or sorted map). Suppose a sorted set (or sorted map) with an explicit comparator c is used with elements (or keys) drawn from a set S. If the ordering imposed by c on S is inconsistent with equals, the sorted set (or sorted map) will behave "strangely." In particular the sorted set (or sorted map) will violate the general contract for set (or map), which is defined in terms of equals. For example, suppose one adds two elements a and b such that (a.equals(b) && c.compare(a, b) != 0) to an empty TreeSet with comparator c. The second add operation will return true (and the size of the tree set will increase) because a and b are not equivalent from the tree set's perspective, even though this is contrary to the specification of the Set.add method. Note: It is generally a good idea for comparators to also implement java.io.Serializable, as they may be used as ordering methods in serializable data structures (like TreeSet, TreeMap). In order for the data structure to serialize successfully, the comparator (if provided) must implement Serializable. For the mathematically inclined, the relation that defines the imposed ordering that a given comparator c imposes on a given set of objects S is: {(x, y) such that c.compare(x, y) <= 0}. The quotient for this total order is: {(x, y) such that c.compare(x, y) == 0}. It follows immediately from the contract for compare that the quotient is an equivalence relation on S, and that the imposed ordering is a total order on S. When we say that the ordering imposed by c on S is consistent with equals, we mean that the quotient for the ordering is the equivalence relation defined by the objects' equals(Object) method(s): {(x, y) such that x.equals(y)}. This interface is a member of the Java Collections Framework. Since: 1.2 See Also:Comparable, Serializable Method Summary int compare(T o1, T o2) Compares its two arguments for order. boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. Method Detail compare int compare(T o1, T o2) Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive. The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.) The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator. equals boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. This method must obey the general contract of Object.equals(Object). Additionally, this method can return true only if the specified object is also a comparator and it imposes the same ordering as this comparator. Thus, comp1.equals(comp2) implies that sgn(comp1.compare(o1, o2))==sgn(comp2.compare(o1, o2)) for every object reference o1 and o2. Note that it is always safe not to override Object.equals(Object). However, overriding this method may, in some cases, improve performance by allowing programs to determine that two distinct comparators impose the same order. Overrides:equals in class Object Parameters:obj - the reference object with which to compare. Returns:true only if the specified object is also a comparator and it imposes the same ordering as this comparator.See Also:Object.equals(Object), Object.hashCode() Overview Package Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 6 PREV CLASS NEXT CLASS FRAMES NO FRAMES All Classes SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2015, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy. Scripting on this page tracks web page traffic, but does not change the content in any way.

A comparison function, which imposes a total ordering on some collection of objects. Comparators can be passed to a sort method (such as Collections.sort or Arrays.sort) to allow precise control over the sort order. Comparators can also be used to control the order of certain data structures (such as sorted sets or sorted maps), or to provide an ordering for collections of objects that don't have a natural ordering. The ordering imposed by a comparator c on a set of elements S is said to be consistent with equals if and only if c.compare(e1, e2)==0 has the same boolean value as e1.equals(e2) for every e1 and e2 in S. Caution should be exercised when using a comparator capable of imposing an ordering inconsistent with equals to order a sorted set (or sorted map). Suppose a sorted set (or sorted map) with an explicit comparator c is used with elements (or keys) drawn from a set S. If the ordering imposed by c on S is inconsistent with equals, the sorted set (or sorted map) will behave "strangely." In particular the sorted set (or sorted map) will violate the general contract for set (or map), which is defined in terms of equals. For example, suppose one adds two elements a and b such that (a.equals(b) && c.compare(a, b) != 0) to an empty TreeSet with comparator c. The second add operation will return true (and the size of the tree set will increase) because a and b are not equivalent from the tree set's perspective, even though this is contrary to the specification of the Set.add method. Note: It is generally a good idea for comparators to also implement java.io.Serializable, as they may be used as ordering methods in serializable data structures (like TreeSet, TreeMap). In order for the data structure to serialize successfully, the comparator (if provided) must implement Serializable. For the mathematically inclined, the relation that defines the imposed ordering that a given comparator c imposes on a given set of objects S is: {(x, y) such that c.compare(x, y) <= 0}. The quotient for this total order is: {(x, y) such that c.compare(x, y) == 0}. It follows immediately from the contract for compare that the quotient is an equivalence relation on S, and that the imposed ordering is a total order on S. When we say that the ordering imposed by c on S is consistent with equals, we mean that the quotient for the ordering is the equivalence relation defined by the objects' equals(Object) method(s): {(x, y) such that x.equals(y)}. This interface is a member of the Java Collections Framework. Since: 1.2 See Also:Comparable, Serializable Method Summary int compare(T o1, T o2) Compares its two arguments for order. boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. Method Detail compare int compare(T o1, T o2) Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive. The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.) The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator. equals boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. This method must obey the general contract of Object.equals(Object). Additionally, this method can return true only if the specified object is also a comparator and it imposes the same ordering as this comparator. Thus, comp1.equals(comp2) implies that sgn(comp1.compare(o1, o2))==sgn(comp2.compare(o1, o2)) for every object reference o1 and o2. Note that it is always safe not to override Object.equals(Object). However, overriding this method may, in some cases, improve performance by allowing programs to determine that two distinct comparators impose the same order. Overrides:equals in class Object Parameters:obj - the reference object with which to compare. Returns:true only if the specified object is also a comparator and it imposes the same ordering as this comparator.See Also:Object.equals(Object), Object.hashCode() Overview Package Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 6 PREV CLASS NEXT CLASS FRAMES NO FRAMES All Classes SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2015, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy. Scripting on this page tracks web page traffic, but does not change the content in any way.

This interface is a member of the Java Collections Framework. Since: 1.2 See Also:Comparable, Serializable Method Summary int compare(T o1, T o2) Compares its two arguments for order. boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. Method Detail compare int compare(T o1, T o2) Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive. The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.) The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator. equals boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. This method must obey the general contract of Object.equals(Object). Additionally, this method can return true only if the specified object is also a comparator and it imposes the same ordering as this comparator. Thus, comp1.equals(comp2) implies that sgn(comp1.compare(o1, o2))==sgn(comp2.compare(o1, o2)) for every object reference o1 and o2. Note that it is always safe not to override Object.equals(Object). However, overriding this method may, in some cases, improve performance by allowing programs to determine that two distinct comparators impose the same order. Overrides:equals in class Object Parameters:obj - the reference object with which to compare. Returns:true only if the specified object is also a comparator and it imposes the same ordering as this comparator.See Also:Object.equals(Object), Object.hashCode() Overview Package Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 6 PREV CLASS NEXT CLASS FRAMES NO FRAMES All Classes SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2015, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy. Scripting on this page tracks web page traffic, but does not change the content in any way.

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Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator.

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Method Detail compare int compare(T o1, T o2) Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive. The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.) The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator. equals boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. This method must obey the general contract of Object.equals(Object). Additionally, this method can return true only if the specified object is also a comparator and it imposes the same ordering as this comparator. Thus, comp1.equals(comp2) implies that sgn(comp1.compare(o1, o2))==sgn(comp2.compare(o1, o2)) for every object reference o1 and o2. Note that it is always safe not to override Object.equals(Object). However, overriding this method may, in some cases, improve performance by allowing programs to determine that two distinct comparators impose the same order. Overrides:equals in class Object Parameters:obj - the reference object with which to compare. Returns:true only if the specified object is also a comparator and it imposes the same ordering as this comparator.See Also:Object.equals(Object), Object.hashCode() Overview Package Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 6 PREV CLASS NEXT CLASS FRAMES NO FRAMES All Classes SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2015, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy. Scripting on this page tracks web page traffic, but does not change the content in any way.

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Caution should be exercised when using a comparator capable of imposing an ordering inconsistent with equals to order a sorted set (or sorted map). Suppose a sorted set (or sorted map) with an explicit comparator c is used with elements (or keys) drawn from a set S. If the ordering imposed by c on S is inconsistent with equals, the sorted set (or sorted map) will behave "strangely." In particular the sorted set (or sorted map) will violate the general contract for set (or map), which is defined in terms of equals. For example, suppose one adds two elements a and b such that (a.equals(b) && c.compare(a, b) != 0) to an empty TreeSet with comparator c. The second add operation will return true (and the size of the tree set will increase) because a and b are not equivalent from the tree set's perspective, even though this is contrary to the specification of the Set.add method. Note: It is generally a good idea for comparators to also implement java.io.Serializable, as they may be used as ordering methods in serializable data structures (like TreeSet, TreeMap). In order for the data structure to serialize successfully, the comparator (if provided) must implement Serializable. For the mathematically inclined, the relation that defines the imposed ordering that a given comparator c imposes on a given set of objects S is: {(x, y) such that c.compare(x, y) <= 0}. The quotient for this total order is: {(x, y) such that c.compare(x, y) == 0}. It follows immediately from the contract for compare that the quotient is an equivalence relation on S, and that the imposed ordering is a total order on S. When we say that the ordering imposed by c on S is consistent with equals, we mean that the quotient for the ordering is the equivalence relation defined by the objects' equals(Object) method(s): {(x, y) such that x.equals(y)}. This interface is a member of the Java Collections Framework. Since: 1.2 See Also:Comparable, Serializable Method Summary int compare(T o1, T o2) Compares its two arguments for order. boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. Method Detail compare int compare(T o1, T o2) Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive. The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.) The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator. equals boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. This method must obey the general contract of Object.equals(Object). Additionally, this method can return true only if the specified object is also a comparator and it imposes the same ordering as this comparator. Thus, comp1.equals(comp2) implies that sgn(comp1.compare(o1, o2))==sgn(comp2.compare(o1, o2)) for every object reference o1 and o2. Note that it is always safe not to override Object.equals(Object). However, overriding this method may, in some cases, improve performance by allowing programs to determine that two distinct comparators impose the same order. Overrides:equals in class Object Parameters:obj - the reference object with which to compare. Returns:true only if the specified object is also a comparator and it imposes the same ordering as this comparator.See Also:Object.equals(Object), Object.hashCode() Overview Package Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 6 PREV CLASS NEXT CLASS FRAMES NO FRAMES All Classes SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2015, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy. Scripting on this page tracks web page traffic, but does not change the content in any way.

The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.) The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator.

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Method Summary int compare(T o1, T o2) Compares its two arguments for order. boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. Method Detail compare int compare(T o1, T o2) Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive. The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.) The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator. equals boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. This method must obey the general contract of Object.equals(Object). Additionally, this method can return true only if the specified object is also a comparator and it imposes the same ordering as this comparator. Thus, comp1.equals(comp2) implies that sgn(comp1.compare(o1, o2))==sgn(comp2.compare(o1, o2)) for every object reference o1 and o2. Note that it is always safe not to override Object.equals(Object). However, overriding this method may, in some cases, improve performance by allowing programs to determine that two distinct comparators impose the same order. Overrides:equals in class Object Parameters:obj - the reference object with which to compare. Returns:true only if the specified object is also a comparator and it imposes the same ordering as this comparator.See Also:Object.equals(Object), Object.hashCode() Overview Package Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 6 PREV CLASS NEXT CLASS FRAMES NO FRAMES All Classes SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2015, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy. Scripting on this page tracks web page traffic, but does not change the content in any way.

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The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator.

In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive. The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.) The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator.

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It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator.

Overrides:equals in class Object Parameters:obj - the reference object with which to compare. Returns:true only if the specified object is also a comparator and it imposes the same ordering as this comparator.See Also:Object.equals(Object), Object.hashCode()

We are happy to welcome you to Gothenburg and the 21st SPS Symposium!On behalf of the SPS organizing committee, we are pleased to invite you to participate in our upcoming meeting in Gothenburg, November 21st-22nd, with this year’s theme - From Single Cells to Populations highlighting the current developments in the field. The SPS Symposium will bring together students, young fellows, senior researchers, industry partners, world-leading scientists to bridge the broad field of proteomics. With the ambition to highlight cutting-edge achievements in proteomics including proteomics in health and disease, clinical proteomics and precision medicine, biomarker discovery and computational proteomics and bioinformatics with the scientific presentations covering areas from technology developments to latest findings. Our two-day program will offer an attractive combination of keynote lectures and seminars mixed with networking opportunities within poster sessions, exhibitions and social events. A poster session will provide the opportunity to present the latest results from your lab. We encourage especially young scientists to participate in the meeting and there will be a prestigious award for the best poster.We hope that YOU will join us in Gothenburg!

Note: It is generally a good idea for comparators to also implement java.io.Serializable, as they may be used as ordering methods in serializable data structures (like TreeSet, TreeMap). In order for the data structure to serialize successfully, the comparator (if provided) must implement Serializable. For the mathematically inclined, the relation that defines the imposed ordering that a given comparator c imposes on a given set of objects S is: {(x, y) such that c.compare(x, y) <= 0}. The quotient for this total order is: {(x, y) such that c.compare(x, y) == 0}. It follows immediately from the contract for compare that the quotient is an equivalence relation on S, and that the imposed ordering is a total order on S. When we say that the ordering imposed by c on S is consistent with equals, we mean that the quotient for the ordering is the equivalence relation defined by the objects' equals(Object) method(s): {(x, y) such that x.equals(y)}. This interface is a member of the Java Collections Framework. Since: 1.2 See Also:Comparable, Serializable Method Summary int compare(T o1, T o2) Compares its two arguments for order. boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. Method Detail compare int compare(T o1, T o2) Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive. The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.) The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator. equals boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. This method must obey the general contract of Object.equals(Object). Additionally, this method can return true only if the specified object is also a comparator and it imposes the same ordering as this comparator. Thus, comp1.equals(comp2) implies that sgn(comp1.compare(o1, o2))==sgn(comp2.compare(o1, o2)) for every object reference o1 and o2. Note that it is always safe not to override Object.equals(Object). However, overriding this method may, in some cases, improve performance by allowing programs to determine that two distinct comparators impose the same order. Overrides:equals in class Object Parameters:obj - the reference object with which to compare. Returns:true only if the specified object is also a comparator and it imposes the same ordering as this comparator.See Also:Object.equals(Object), Object.hashCode() Overview Package Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 6 PREV CLASS NEXT CLASS FRAMES NO FRAMES All Classes SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2015, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy. Scripting on this page tracks web page traffic, but does not change the content in any way.

Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator.

For example, suppose one adds two elements a and b such that (a.equals(b) && c.compare(a, b) != 0) to an empty TreeSet with comparator c. The second add operation will return true (and the size of the tree set will increase) because a and b are not equivalent from the tree set's perspective, even though this is contrary to the specification of the Set.add method. Note: It is generally a good idea for comparators to also implement java.io.Serializable, as they may be used as ordering methods in serializable data structures (like TreeSet, TreeMap). In order for the data structure to serialize successfully, the comparator (if provided) must implement Serializable. For the mathematically inclined, the relation that defines the imposed ordering that a given comparator c imposes on a given set of objects S is: {(x, y) such that c.compare(x, y) <= 0}. The quotient for this total order is: {(x, y) such that c.compare(x, y) == 0}. It follows immediately from the contract for compare that the quotient is an equivalence relation on S, and that the imposed ordering is a total order on S. When we say that the ordering imposed by c on S is consistent with equals, we mean that the quotient for the ordering is the equivalence relation defined by the objects' equals(Object) method(s): {(x, y) such that x.equals(y)}. This interface is a member of the Java Collections Framework. Since: 1.2 See Also:Comparable, Serializable Method Summary int compare(T o1, T o2) Compares its two arguments for order. boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. Method Detail compare int compare(T o1, T o2) Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of -1, 0, or 1 according to whether the value of expression is negative, zero or positive. The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.) The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0. Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z. It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals." Parameters:o1 - the first object to be compared.o2 - the second object to be compared. Returns:a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Throws: ClassCastException - if the arguments' types prevent them from being compared by this comparator. equals boolean equals(Object obj) Indicates whether some other object is "equal to" this comparator. This method must obey the general contract of Object.equals(Object). Additionally, this method can return true only if the specified object is also a comparator and it imposes the same ordering as this comparator. Thus, comp1.equals(comp2) implies that sgn(comp1.compare(o1, o2))==sgn(comp2.compare(o1, o2)) for every object reference o1 and o2. Note that it is always safe not to override Object.equals(Object). However, overriding this method may, in some cases, improve performance by allowing programs to determine that two distinct comparators impose the same order. Overrides:equals in class Object Parameters:obj - the reference object with which to compare. Returns:true only if the specified object is also a comparator and it imposes the same ordering as this comparator.See Also:Object.equals(Object), Object.hashCode() Overview Package Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 6 PREV CLASS NEXT CLASS FRAMES NO FRAMES All Classes SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2015, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy. Scripting on this page tracks web page traffic, but does not change the content in any way.