public class Compare {    /**    * == 與 equals()區(qū)別    */   public static void main(String[] args) {     String s1 = new String("Hello,World!"); //創(chuàng)建兩個(gè)String型對(duì)象引用;     String s2 = new String("Hello,World!");          String s3 = s1;             //將s1對(duì)象引用賦予s3          System.out.println("s2==s3的運(yùn)算結(jié)果為:" + (s2==s3)); //地址不一樣     System.out.println("s1==s3的運(yùn)算結(jié)果為:" + (s1==s3)); //地址一樣         System.out.println("s2.equals(s3)的運(yùn)算結(jié)果為:"+(s2.equals(s3)));//內(nèi)容一樣   } }