Difference between == operator and .equals() method

In this general we can use == operator for reference comparison (address comparison) and .equals() method for content comparison

Ex: - String s1=new String (“raja”);

package com.javahighq.test;

public class Test {

public static void main(String[] args) {

      String str=new String("raja");

      String str2=new String("raja");

      System.out.println(str==str2);//false

      System.out.println(str.equals(str2));//true

}

}

Note :- for any object reference str,

Str==null is always false

But null == null is always true

Ex :- String s=new String(“raja”)

System.out.println(s==null);//false

System.out.println(null==null);//true