Why does concatenated characters print a number?

Question

I have the following class:

   public class Go {
     public static void main(String args[]) {
      System.out.println("G" + "o");
      System.out.println('G' + 'o');
     }
   }

And this is compile result;

  Go
  182

Why my output contain a number?

Answer 1

In the second case it adds the unicode codes of the two characters (G - 71 and o - 111) and prints the sum. This is because char is considered as a numeric type, so the + operator is the usual summation in this case.

Answer 2

+ operator with character constant 'G' + 'o' prints addition of charCode and string concatenation operator with "G" + "o" will prints Go.

Answer 3

The plus in Java adds two numbers, unless one of the summands is a String, in which case it does string concatenation.

In your second case, you don't have Strings (you have char, and their Unicode code points will be added).

Answer 4

System.out.println("G" + "o");
  System.out.println('G' + 'o');

First one + is acted as a concat operater and concat the two strings. But in 2nd case it acts as an addition operator and adds the ASCII (or you cane say UNICODE) values of those two characters.