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public interface Comparator
Defines comparison methods useable to impose a total ordering on a collection of objects.
The ordering you can produce with these methods is the class's
natural ordering, and the class's implementation of
compare
is its natural comparison method.
Method Summary | ||
---|---|---|
int |
compare(Object o1,
Object o2)
Compares two arguments for order. |
|
boolean |
equals(Object obj)
Determines if provided object is equal to this one. |
Method Detail |
---|
int compare(Object o1, Object o2)
o1
- First object to compare.o2
- Second object to compare.
ClassCastException
- If this comparator cannot compare the two
objects.boolean equals(Object obj)
This method must obey the general contract of
Object.equals(Object)
.
Additionally, this method can return true only if the provided
object also implements this interface and 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.
equals
in class Object
obj
- Object to compare with this comparator.
Boolean.hashCode()
,
Hashtable
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