String equality in java

package com.srini;

public class StringEquality {

/**
* @param args
*/
public static void main(String[] args) {
String obj1 = new String("xyz");
String A= "TEST";
String B= new String("TEST");

String obj2 = new String("xyz");

if(obj1 == obj2)
  System.out.println("obj1==obj2 is TRUE");
else
 System.out.println("obj1==obj2 is FALSE");
if(obj1.equals(obj2))
  System.out.println("obj1.equals(obj2) is TRUE");
else
 System.out.println("obj1.equals(obj2) is FALSE");

if(A == B)
  System.out.println("A==B is TRUE");
else
 System.out.println("A==B is FALSE");
if(A.equals(B))
  System.out.println("A.equals(B) is TRUE");
else
 System.out.println("A.equals(B) is FALSE");
StringEquality s = new StringEquality();
int x=10;
s.calc(x);
System.out.println("X :"+x);
}

public void calc(int x){
x=20;
}


}