Difference between ==, equals and hashcode in java

String s1= new String("abc");
String s2= new String("abc");
String s3 ="abc";
System.out.println(s1==s3);
System.out.println(s1==s2);
System.out.println(s1.equals(s2));
System.out.println(s1.equals(s3));
System.out.println(s1.hashCode());
System.out.println(s2.hashCode());
System.out.println(s3.hashCode());

Output is: false false true true 96354 96354 96354

==  Compares real equality of Objects (i.e) both references should point to the same object, not their content. 

.equal Compares content of a object.            String a = new String("aa");
    String b = new String("aa"); 

           a and b are pointing to different objects.

Hashcode  If objects are equal then their hashchodes must be the same, but if hashcodes are the same, it doesn't mean that objects are equal.