String question

[ali farid]

What will be the output of following program?
public class Str{
String s1 = "abc";
String s2 = "abc";
String s3 = "abcabc";
String s4 = new String("abcabc").intern() ;

Str(){
System.out.println(s1 == s2);
System.out.println(s3 == s4);
}

public static void main(String args[]){
Str str = new Str();
}
}
1. true
false
2. false
false
3. true
true
4. false
true
5. compiler error

[Rajiv Ranjan]

Hi Ali :
The output will be
3) true
true
and yes, I have checked it.
This is because when you call intern() on s4 , you are basically putting s4 in the string pool.
Hope it helps.