Wrappers with String and Collections

[Sekhar Choudary]

    
import java.util.*;
public class CollWrapperEX{
private String s;
public CollWrapperEX(String s){ this.s=s; }
public static void main(String[] args){
HashSet<Object> hs=new HashSet<Object>();
CollWrapperEX ws1=new CollWrapperEX("xyz");
CollWrapperEX ws2=new CollWrapperEX("xyz");
String s1=new String("xyz");
String s2=new String("xyz");
hs.add(ws1);hs.add(ws2);hs.add(s1);hs.add(s2);
}
}

I am getting the size as 3
Can anyone expalin this.
Thanks

[Henry Wong]

To understand why this is so, you need to understand hashing. And since you asked about hashing here...

https://coderanch.com/t/269877/java-programmer-SCJP/certification/Help-hashcodes

I think it is best if you undertand that first.

Henry