Java Data Types Questions

Question

public class Main {

  public static void main(String[] args) {
    int j = + -1234;
    System.out.printf("%d", j);
    System.out.println();
    System.out.println(j);
  }
}

The Result is -1234. Can any body explain me why the result is -1234 is coming?

Answer 1

The assigment int j = + -1234; is equivalent to:

j = (1) * (-1) * 1234 (a)

now:

-1 = (1) * (-1) (b)

so substitute b into a and get:

j= -1 * 1234

so j = -1234

In the assignment equation the + and - are acting as unary oprators

Answer 2

Actually the java compiler take +- as +- so it results to -1234. if you try -+-1234 then it will processed as -+*-1234 which is 1234.

public class Main {

        public static void main(String[] args) {
         int j = -+ -1234;
         System.out.printf("%d", j);
         System.out.println();
         System.out.println(j);

} }

This will print 1234. you cannot use ++/-- since it is already predefined in java for increment and decrement operation