Untitled

package com.company;

import java.util.ArrayList;
import java.util.List;

class Loop1{

    public static void main(String[] args) throws InterruptedException {
	// write your code here
        long start = System.currentTimeMillis();

        List<Thread> threads = new ArrayList<>();
        int thread = 40, loop = 100;
        for (int i = 1; i <= thread; ++i) {
            Thread t = new Loop2("Thread " + i, loop);
            t.start();
            threads.add(t);
        }

        for (Thread t : threads) {
            t.join();
        }

        long stop = System.currentTimeMillis();
        System.out.println("Total Thread : " + thread + " |  Looping : " + loop);
        System.out.println("Total : " + (stop-start) + " Milisecond");
    }
}


class Loop2 extends Thread {
    private String myName;
    private int looping;

    public Loop2 (String name, int loop) {
        myName = name;
        looping = loop;
    }

    public void run() {
        for(int i = 1; i <= looping; i++) {
            System.out.println(myName + " (" + i + ")");
        }

    }

}