java random spike

RandomSpike.java

import java.util.Random;

public class RandomSpike {

    private static final int PERCENTAGE = 50;

    public static void main(String[] args) {
        intNext100Example();
        intNext100KExample();
        doubleExample();
    }

    private static void intNext100Example() {
        int a = 0;
        int b = 0;
        Random r = new Random();
        long start = System.currentTimeMillis();

        for (int i = 0; i < Integer.MAX_VALUE; i++) {
            if (r.nextInt(100) > PERCENTAGE) {
                a++;
            } else {
                b++;
            }
        }

        System.out.println("nextInt(100):");
        System.out.println("a=" + a);
        System.out.println("b=" + b);
        System.out.println("t=" + (System.currentTimeMillis() - start));
    }

    private static void intNext100KExample() {
        int a = 0;
        int b = 0;
        Random r = new Random();
        long start = System.currentTimeMillis();

        for (int i = 0; i < Integer.MAX_VALUE; i++) {
            if (r.nextInt(100000) > PERCENTAGE * 1000) {
                a++;
            } else {
                b++;
            }
        }

        System.out.println("nextInt(100K):");
        System.out.println("a=" + a);
        System.out.println("b=" + b);
        System.out.println("t=" + (System.currentTimeMillis() - start));
    }

    private static void doubleExample() {
        int a = 0;
        int b = 0;
        Random r = new Random();
        long start = System.currentTimeMillis();

        for (int i = 0; i < Integer.MAX_VALUE; i++) {
            if (r.nextDouble() > (double) PERCENTAGE / 100) {
                a++;
            } else {
                b++;
            }
        }

        System.out.println("nextDouble:");
        System.out.println("a=" + a);
        System.out.println("b=" + b);
        System.out.println("t=" + (System.currentTimeMillis() - start));
    }
}

nextInt(100):
a=1052236388
b=1095247259
t=34278

nextInt(100K):
a=1073711333
b=1073772314
t=35483

nextDouble:
a=1073733209
b=1073750438
t=65782