Question

I’ve been toying around with Java recently and I’ve encountered a problem:

Whenever I put System.out.println() or System.out.print() inside a for loop, there is no output on the console.

For example:

package experimental;

public class Main {
    public static void main(String args[]) {
        recur();
    }

    public static void recur() {
        for(int x = 0; x == 10; x++) {
            for(int y = 0; y == 10; y++) {
                System.out.print(x + "-" + y + " ");
            }
        }
    }
}

Outputs:

*crickets*

Answer 1

The loop condition isn’t true to even begin with… x == 10 is not true when x = 0.
Had it been, you would’ve also noticed the second loop condition is also not true to begin with; similarly , y == 10 is not true as y = 0. You probably confused the condition with one for stopping.

for(int x = 0; x == 10; x++) {
     for(int y = 0; y == 10; y++) {

Change to the following if you want x, y to vary from [0, 10):

for(int x = 0; x < 10; x++) {
    for(int y = 0; y < 10; y++) {

… or the following for [0, 10]:

for(int x = 0; x <= 10; x++) {
    for(int y = 0; y <= 10; y++) {