Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.util.stream.IntStream;

public class Main {
    public static void main(String[] args) {
        long first = System.currentTimeMillis();
        IntStream.range(0, 4).map(a -> {
            sleep1sec();
            return a;
        }).reduce((a, b) -> a * b).ifPresent(System.out::println);

        long second = System.currentTimeMillis();
        System.out.println("time 1:" + (second - first));

        IntStream.range(0, 4).parallel().map(a -> {
            sleep1sec();
            return a;
        }).reduce((a, b) -> a * b).ifPresent(System.out::println);

        long last = System.currentTimeMillis();
        System.out.println("time 2:" + (last - second));

    }

    private static void sleep1sec() {
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
        }
    }
}