Question

System.out.println(1+2+"3");
System.out.println("1"+2+3);

output:-

33
123

First case is understood but the second case is not clear.

Answer 1

If we are doing + operation in string then is works as append(concatenation).

So in your first case 1+2+"3" … 1+2 =3 but when it perform 3+"3" java concate 3 into String 3 that is 33.

and in second example "1"+2+3 … 2 is append into String “1” that results as 12 and then "12" + 3 so result is = 123.