NetBeans_Eclipse_測試程式印出字元速度

import java.util.Random;

public class MainClass {

    public static void main(String[] args) {
        Random r = new Random();
        long t1 = System.nanoTime();
        for (int i = 0; i < 1000; i++) {
            for (int j = 0; j < 1000; j++) {
                if (r.nextInt(4) == 0) {
                    System.out.printf("O");
                } else {
                    //System.out.printf("#");
                    System.out.printf("B");
                    //System.out.printf("中");
                }
            }
            System.out.printf("\n");
        }
        long t2 = System.nanoTime();
        double seconds = (double) (t2 - t1) / 1000000000.0;
        System.out.printf("%f seconds\n", seconds);
    }
}