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java.lang.Objectorg.apache.commons.collections.comparators.ComparableComparator
public class ComparableComparator
A Comparator that compares
Comparable objects.
ClassCastException if
either of the arguments to compare
were null, not Comparable,
or for which compareTo gave
inconsistent results. This is no longer the case. See
compare for details.
Collections.reverseOrder(),
Serialized Form| Constructor Summary | |
|---|---|
ComparableComparator()
Constructor whose use should be avoided. |
|
| Method Summary | |
|---|---|
int |
compare(java.lang.Object obj1,
java.lang.Object obj2)
Compare the two Comparable arguments. |
boolean |
equals(java.lang.Object object)
Returns true iff that Object is
is a Comparator whose ordering is
known to be equivalent to mine. |
static ComparableComparator |
getInstance()
Gets the singleton instance of a ComparableComparator. |
int |
hashCode()
Implement a hash code for this comparator that is consistent with equals. |
| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public ComparableComparator()
Please use the getInstance() method whenever possible.
| Method Detail |
|---|
public static ComparableComparator getInstance()
Developers are encouraged to use the comparator returned from this method instead of constructing a new instance to reduce allocation and GC overhead when multiple comparable comparators may be used in the same VM.
public int compare(java.lang.Object obj1,
java.lang.Object obj2)
Comparable arguments.
This method is equivalent to:
((Comparable)obj1).compareTo(obj2)
compare in interface java.util.Comparatorobj1 - the first object to compareobj2 - the second object to compare
java.lang.NullPointerException - when obj1 is null,
or when ((Comparable)obj1).compareTo(obj2) does
java.lang.ClassCastException - when obj1 is not a Comparable,
or when ((Comparable)obj1).compareTo(obj2) doespublic int hashCode()
equals.
hashCode in class java.lang.Objectpublic boolean equals(java.lang.Object object)
true iff that Object is
is a Comparator whose ordering is
known to be equivalent to mine.
This implementation returns true
iff object.
equals getClass()this.getClass().
Subclasses may want to override this behavior to remain consistent
with the Comparator.equals(Object) contract.
equals in interface java.util.Comparatorequals in class java.lang.Objectobject - the object to compare with
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