Java: sum of two integers being printed as concatenation of the two

Question

Consider this code:

int x = 17;
int y = 013;
System.out.println(\"x+y = \" + x + y);

When I run this code I get the output 1711. Can anybod

Answer 1

"x+y = " + x+y

equals

("x+y = " + x) + y

which equals

("x+y = " + String.valueOf(x)) + y

which equals

"x+y = " + String.valueOf(x) + String.valueOf(y)

013 is octal = 11 in decimal