import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class ExecutorTest2_2 {
    public ExecutorTest2_2() {
        System.out.println("Initial Threads:");
        ConcurrentUtils.listThread();

        ExecutorService e = Executors.newSingleThreadExecutor();
        
        e.execute(new RunnableTask());

        try {
            Thread.sleep(1000L);
        } catch (InterruptedException ex) {
            ex.printStackTrace();
        }

        System.out.println("RuunableTask1 Threads;");
        ConcurrentUtils.listThread();

        e.execute(new RunnableTask());

        try {
            Thread.sleep(1000L);
        } catch (InterruptedException ex) {
            ex.printStackTrace();
        }

        System.out.println("RuunableTask2 Threads;");
        ConcurrentUtils.listThread();

        try {
            Thread.sleep(4000L);
        } catch (InterruptedException ex) {
            ex.printStackTrace();
        }

        System.out.println("Processed Threads:");
        ConcurrentUtils.listThread();

        e.shutdown();

        System.out.println("Final Threads:");
        ConcurrentUtils.listThread();
    }

    class RunnableTask implements Runnable {
        public void run() {
            System.out.println("RunnableTask starts.");
            try {
                Thread.sleep(2000L);
            } catch (InterruptedException ex) {
                System.out.println("RunnableTask is Canceled");
                return;
            }
            System.out.println("RunnableTask is Done.");
        }
    }

    public static void main(String[] args) {
        new ExecutorTest2_2();
    }
}