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HDFS, mail # user - Re: CompareTo vs equals

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Re: CompareTo vs equals
Sai Sai 2013-03-28, 03:16
IntPair  class has these 2 methods, i understand that compareTo is used for comparing but when is equals method used and is it necessary to write it when we alread have implemented compareTo method.

public int compareTo(IntPair that) {
int cmp = first.compareTo(that.first);
cmp = second.compareTo(that.second);
return cmp;
public boolean equals(Object obj) {
if (obj instanceof IntPair){
IntPair that = (IntPair)obj;
return (first.equals(that.first) && second.equals(that.second));
return false;


Ted Yu 2013-03-28, 03:22