Constant Pool

Java

String s1 = "Hello";String s2 = s1;String s3 = "Hello";String s4 = new String("Hello");String s5 = s4;String s6 = new String("Hello");System.out.println(s1 == s2);       // trueSystem.out.println(s1 == s3);       // trueSystem.out.println(s2 == s3);       // trueSystem.out.println(s4 == s5);       // trueSystem.out.println(s4 == s6);       // falseSystem.out.println(s5 == s6);       // false

C/C++

char * s1 = "abcd";char * s2 = "abcd";char s3[] = "abcd";char s4[] = "abcd"; printf("%d\n", s1 == s2);       // trueprintf("%d\n", s3 == s4);       // false