String.txt

String a="abc";//创建字符串方式1 String b =new String("abc"); //创建字符串方式2 System.out.println(a==b); //false,内存地址不相等 String c =new String("abc"); String d =new String("abc"); System.out.println(c==d);//false 内存地址不相等 String a1="abc"; String b1 =new String("abc"); System