第一个是false而第二个是true,不太理解
String s1 = new String("hello");
String intern1 = s1.intern();
String s2 = "hello";
System.out.println(s1 == s2);
String s3 = new String("hello") + new String("hello");
String intern3 = s3.intern();
String s4 = "hellohello";
System.out.println(s3 == s4);