Comparator and comparable

Java.util
Interface comparator<t>

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Compare

int Compare(t? O1, t? o2)

Compare the two parameters used to sort. Returns a negative integer, 0, or a positive integer, respectively, based on the first parameter less than, equal to, or greater than the second parameter.

equals

Boolean equals(Objectobj)

Indicates whether a different object is "equal" to this Comparator.

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Java.lang
Interface comparable<t>

CompareTo

int compareTo(T? o)

Compares the order of this object with the specified object. If the object is less than, equal to, or greater than the specified object, it returns a negative integer, 0, or a positive integer, respectively.

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Reference documents:

JDK API 1.6.0

Comparator and comparable