@@ -0,0 +1,638 @@
+public class StringTest %7B%0A    %0A    public static void main(String%5B%5D args) %7B%0A        String s1 = %22abc1%22;%0A        String s2 = %22abc1%22;%0A        if (s1 == s2) %7B%0A            System.out.println(%22OK1!%22);%0A        %7D else %7B%0A            System.out.println(%22Fail1!%22);%0A        %7D%0A        %0A        int x = 1;%0A        String s3 = %22abc%22 + x;%0A        if (s1 != s3) %7B%0A            System.out.println(%22OK2!%22);%0A        %7D else %7B%0A            System.out.println(%22Fail2!%22);%0A        %7D%0A        %0A        s3 = s3.intern();%0A        if (s1 == s3) %7B%0A            System.out.println(%22OK3!%22);%0A        %7D else %7B%0A            System.out.println(%22Fail3!%22);%0A        %7D%0A    %7D%0A    %0A%7D%0A

add StringTest.java