Doubt in HashSet

I have a class which has a String variable. I am adding objects of this class in a HashSet. However, duplicate values are getting added in the HashSet even though I have overriden the equals method.

Any idea why this is happening?

My code is as below.

Thanks for help in advance.

MG

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import java.util.*;

public class HashSetTest {

public static void main(String[] args) {

HashSet<MyStrings> hs = new HashSet<MyStrings>();

System.out.println(hs.add(new MyStrings("SCJP")));

System.out.println(hs.add(new MyStrings("SCJD")));

System.out.println(hs.add(new MyStrings("MCSE")));

System.out.println(hs.add(new MyStrings("CSQA")));

System.out.println(hs.add(new MyStrings("SCJP")));

}

}

class MyStrings {

String str;

MyStrings(String s) {

str = s;

}

public String getValue() {

return str;

}

public boolean equals(Object obj) {

System.out.println("In equals");

if((obj instanceof MyStrings) && ((MyStrings) obj).getValue() == this.str) return true;

else return false;

}

}

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[1182 byte] By [mona_ga] at [2007-11-26 13:29:37]