Sting 的几个题

  public static void main(String[] args){ String s1 = "ok"; String s2 = "ok"; String s3 = s1 + "o"; String s4 = "oko"; String s5 = "ok"+"o"; String s6 = new String("ok"); System.out.println((s1==s2)); //true System.out.println((s1==s6)); //false System.out.println((s3==s4)); //false System.out.println((s4==s5)); //true }