What is going on here?

Question

I Don't understand What is going on in this code.

public class Program {
public static void main(String[] args) {

System.out.print((1 + "1") + 1 +1);

}
}

The output is 1111. But why? What happens with the sum of 1 + 1? why is not 112?

Answer 1

All "+" operator are treated as concatenate operator After a string literal.

(1 + "1")+1+1

As you can see "1" this is a string literal here so all "+" use to append all the number.

//Output
1111

Answer 2

The last two 1s will be appended to the string 11 one by one.

Answer 3

Changing the string to a 2 to make this easier to read, I think the result step by step is:

(((1 + "2") + 1) + 1)
((1"2") + 1) + 1)
(1"2"1) + 1
1"2"11
1211

Answer 4

I understand right now, thanks!!