Addition

You can add any two ints using the + operator.

int x = 5;
// y will be 6
int y = x + 1;
// z will be 11
int z = x + y;

System.out.println(x);
System.out.println(y);
System.out.println(z);

Adding a negative number does the same thing as subtraction.

int x = 5;
// y will be 1
int y = x + -4;

System.out.println(x);
System.out.println(y);