Why does + work with Strings in Java?

Question

Java can\'t do operator overloading, but + works okay for String and Integer and some other classes. How is this possible?

Answer 1

The Java language provides special support for the string concatenation operator ( + ), and for conversion of other objects to strings.

String s = "string 1" + "string 2";

What actually is execute is

(new StringBuilder()).append("string 1").append("string 2").toString()