Why is printing "B" dramatically slower than printing "#"?

I generated two matrices of 1000 x 1000: First Matrix: O and #. Second Matrix: O and B. Using the following code, the first matrix took 8.52 seconds to complete: Random r = new Random(); for (int i = 0; i < 1000; i++) { for (int j = 0; j < 1000; j++) { if (r.nextInt(4) == 0) { System.out.print("O"); } else { System.out.print("#"); } } System.out.println(""); } With this code, the second matrix took 259.152 seconds to complete: Random r = new Random(); for (int i = 0; i < 1000; i++) { for (int j = 0; j < 1000; j++) { if (r.nextInt(4) == 0) { System.out.print("O"); } else { System.out.print("B"); // only line changed } } System.out.println(""); } What is the reason behind the dramatically different run times? As suggested in the comments, printing only System.out.print("#"); takes 7.8871 seconds, whereas System.out.print("B"); gives still printing.... As others pointed out that it works for them normally, I tried Ideone.com for instance, and both pieces of code execute at the same speed. Test Conditions: I ran this test from Netbeans 7.2, with the output into its console I used System.nanoTime() for measurements

Marayaty Marayaty
Aug 28, 2024 - 04:00
0 5
Why is printing "B" dramatically slower than printing "#"?

I generated two matrices of 1000 x 1000:

First Matrix: O and #.
Second Matrix: O and B.

Using the following code, the first matrix took 8.52 seconds to complete: 

Random r = new Random();
for (int i = 0; i < 1000; i++) {
    for (int j = 0; j < 1000; j++) {
        if (r.nextInt(4) == 0) {
            System.out.print("O");
        } else {
            System.out.print("#");
        }
    }
            
   System.out.println("");
 }

With this code, the second matrix took 259.152 seconds to complete: 

Random r = new Random();
for (int i = 0; i < 1000; i++) {
    for (int j = 0; j < 1000; j++) {
        if (r.nextInt(4) == 0) {
            System.out.print("O");
        } else {
            System.out.print("B"); // only line changed
        }
    }
                
    System.out.println("");
}

What is the reason behind the dramatically different run times?

As suggested in the comments, printing only System.out.print("#"); takes 7.8871 seconds, whereas System.out.print("B"); gives still printing....

As others pointed out that it works for them normally, I tried Ideone.com for instance, and both pieces of code execute at the same speed.

Test Conditions:

  • I ran this test from Netbeans 7.2, with the output into its console
  • I used System.nanoTime() for measurements
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