public class Compare { 
 
  /** 
   * == 与 equals()区别 
   */ 
  public static void main(String[] args) { 
    String s1 = new String("Hello,World!"); //创建两个String型对象引用; 
    String s2 = new String("Hello,World!"); 
     
    String s3 = s1;             //将s1对象引用赋予s3 
     
    System.out.println("s2==s3的运算结果为:" + (s2==s3)); //地址不一样 
    System.out.println("s1==s3的运算结果为:" + (s1==s3)); //地址一样 
        System.out.println("s2.equals(s3)的运算结果为:"+(s2.equals(s3)));//内容一样 
  } 
}