String reference not changing

Question

I have 2 files as follows. (Runnable code)
1. StringTest.java
package mytest;
public class StringTest
     public static String s1 = "Hello";
     public static void main(String args[])
          String s2= "Hello";
          String s3= "Hello";
          System.out.println("1. s1 s2 : " + (s1 == s2));
          System.out.println("2. s2 s3 : " + (s2 == s3));
          System.out.println("3. s1 s3 : " + (s1 == s3));
          System.out.println("4. s1 s4 : " + (s1 == InnerMain.s4));
          System.out.println("5. s2 s4 : " + (s1 == InnerMain.s4));
          System.out.println("6. s1 s5 : " + (s1 == OuterClass.s5));
          System.out.println("7. s4 s5 : " + (InnerMain.s4 == OuterClass.s5));
          System.out.println("8. s2 s5 : " + (s2 == OuterClass.s5));
          System.out.println("9. s3 s5 : " + (s3 == OuterClass.s5));
          SameFile sf = new SameFile();
          System.out.println("10. s1 s5 : " + (s1 == sf.s6));
          System.out.println("11. s2 s5 : " + (s2 == sf.s6));
          System.out.println("12. s3 s5 : " + (s3 == sf.s6));
          System.out.println("13. s4 s5 : " + (InnerMain.s4  == sf.s6));
          System.out.println("14. s5 s5 : " + (OuterClass.s5  == sf.s6));
          sf.s6 = "Hello";
          System.out.println("10. s1 s5 : " + (s1 == sf.s6));
          System.out.println("11. s2 s5 : " + (s2 == sf.s6));
          System.out.println("12. s3 s5 : " + (s3 == sf.s6));
          System.out.println("13. s4 s5 : " + (InnerMain.s4  == sf.s6));
          System.out.println("14. s5 s5 : " + (OuterClass.s5  == sf.s6));
     public static class InnerMain
          public static String s4 = "Hello";
class SameFile
     public String s6 = "Hello";
}2.OuterClass.java
package mytest;
public class OuterClass
     public static String s5 = "Hello";
}OUTPUT
1. s1 s2 : true
2. s2 s3 : true
3. s1 s3 : true
4. s1 s4 : true
5. s2 s4 : true
6. s1 s5 : true
7. s4 s5 : true
8. s2 s5 : true
9. s3 s5 : true
10. s1 s5 : true
11. s2 s5 : true
12. s3 s5 : true
13. s4 s5 : true
14. s5 s5 : true
10. s1 s5 : true
11. s2 s5 : true
12. s3 s5 : true
13. s4 s5 : true
14. s5 s5 : true"Hello" : String references dont change in any case?
String is immutable so no problem .. but whats going on ..

Answer 1

When you create a new String variable having the contents already existing in the String Pool ,then the reference point to existing data.
e.g.
String a="Hello";//Create a block of memory in the Pool with Data "Hello"
String b="Hello";// Search for any block having data "Hello", here existing then b will point to same block.....
// when you check s1==s2 // It check for the reference
// when you check s1.equals(s2) // It check for the contents(value) of variables