comparemyass

Test.java

import java.util.Random;

public class LongCompare {

    static Random r = new Random();

    static int compareLikeLong(long x, long y) {
        return (x < y) ? -1 : ((x == y) ? 0 : 1);
    }

    static int compareBadass(long x, long y) {
        if (x > y) return 1;
        else return (int) (y - x >> 63);
    }

    public static void main(String... args) {

        long[] longs = new long[Integer.MAX_VALUE / 1024];
        for (int i = 0; i < Integer.MAX_VALUE / 1024; i++) {
            longs[i] = r.nextLong();
        }

        long startTime = System.nanoTime();
        for (int i = 0; i < Integer.MAX_VALUE / 1024 - 1; i++) {
            compareLikeLong(longs[i], longs[i++]);
        }
        long endTime = System.nanoTime();
        System.out.println("time elapsed: " + (endTime - startTime));

        startTime = System.nanoTime();
        for (int i = 0; i < Integer.MAX_VALUE / 1024 - 1; i++) {
            compareBadass(longs[i], longs[i++]);
        }
        endTime = System.nanoTime();
        System.out.println("time elapsed: " + (endTime - startTime));

    }
}