Different values for String?

Question

I'm newbie to java.

class Demo{
    public static void main(String[] args) {
        String s1=new String("abc"); 
        String s2=new String("abc"); 
        String s3="xyz";
        String s4="xyz";

        System.out.println(s1==s2); //line 7
        System.out.println(s3==s4); //line 8
    }
}

I just don't understand why line 7 got false and line 8 got true.

I would be so grateful if someone explain me this.

Related: stackoverflow.com/questions/2486191/what-is-the-java-string-pool-and-how-is-s-different-from-new-strings — tonychow0929, Jul 04 '15 at 01:48

score -1 · Answer 1 · answered Jul 04 '15 at 01:51

When you use:

String s1=new String("abc"); 
String s2=new String("abc");

s1 and s2 are to different objects both created at runtime.

String s3="xyz";
String s4="xyz";

s3 and s4 are assigned at compilation time and java compiler stores only one copy of the string.

Java intern

Different values for String?

1 Answers1