Constant Pool output doesn't match

[Tushar Goel]

I have come across this question and i thought true should be printed in 2nd case as Strings in constant pool sharing same reference but it returns false.

String s1 = "Rakesh";
String s2 ="Rakesh";
String s3 = s1+ s2;
String s4 ="RakeshRakesh"

System.out.println(s1==s2) //returns true
System.out.println(s3==s4) //return false

[Mike. J. Thompson]

Your String s3 is not in the constant pool.

From the Java Language Specification section 15.8.1 (talking about the String Concatenation operator +):

The String object is newly created unless the expression is a constant expression.

Your expression 's1 + s2' is not a constant expression, so the result is a new String object.