//import java.util.*;
public class StringObject{
    public static void main(String[] args) {
        String s1="OOPJ";
        String s2="object oriented program";
        String s3="OOPJ";
        String s4=s3;
        String s5=new String("OOPJ");
        String s6=new String("object oriented program");
        System.out.println("s1 and s2 have same reference :"+(s1==s2));
        System.out.println("s3 and s4 have same reference :"+(s3==s4));
        System.out.println("s1 and s5 have same reference :"+(s1==s5));
        System.out.println("s2 and s6 have same reference :"+(s2==s6));
        System.out.println("s3 and s6 have same reference :"+(s3.equals(s5)));
        System.out.println("s2 and s6 have same reference :"+(s2.equalsIgnoreCase(s6)));         



    }
}