concurrency.java

package com.company;

import java.util.ArrayList;
import java.util.Stack;

/**
 * Created by wannabe on 08.05.15.
 */
public class ThreadHandle {
    public static final int threadsCount = 10;
    public static void main(String[] args) throws InterruptedException {
        final Stack<Thread> threads = new Stack<>();
        for (int i = 0; i < threadsCount; i++) {
            final String index = Integer.toString(i);
            Thread thread = new Thread(new Runnable() {
                @Override
                public void run() {
                    while (true) {
                        try {
                            System.out.println("Hello, i am thread " + index);
                            Thread.sleep(threadsCount  * 1000);
                        } catch (InterruptedException e) {
                            System.out.println("Thread " + index + " was closed");
                            return;
                        }
                    }
                }
            });
            threads.push(thread);
            Thread.sleep(1000);
            thread.start();
        }

        Thread watcher = new Thread(new Runnable() {
            @Override
            public void run() {
                while (!allThreadsDead(threads)) {
                    try {
                        Thread.sleep(4000);
                        threads.pop().interrupt();
                    } catch (InterruptedException e) {
                        System.out.println("Whos dare to stop watcher?!");
                    }
                }
            }
        });
        watcher.start();


    }

    public static boolean allThreadsDead(Stack<Thread> threads) {
        for (Thread thread : threads) {
            if (thread.isAlive()) {
                return false;
            }
        }
        return true;
    }
}