3A-Thread

//Thread1a.java
public class Thread1a implements Runnable {
	long click;
	private volatile boolean running = true;
	Thread t;
	
	public Thread1a(int p)
	{
		t = new Thread(this);
		t.setPriority(p);
	}
	public void run()
	{
		while(running)
		{
			click++;
		}
	}

	public void start()
	{
		t.start();
	}
	public void stop()
	{
		running = false;
	}
}

//Demo.java
public class Demo {
	public static void main(String args[]) {
		
	
	Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
	Thread1a hi1 = new Thread1a(Thread.NORM_PRIORITY + 2);
	Thread1a hi2 = new Thread1a(Thread.NORM_PRIORITY - 2);
	Thread1a hi3 = new Thread1a(Thread.NORM_PRIORITY + 3);
	Thread1a hi4 = new Thread1a(Thread.NORM_PRIORITY - 3);
	Thread1a hi5 = new Thread1a(Thread.NORM_PRIORITY + 4);
	
	hi1.start();
	hi2.start();
	hi3.start();
	hi4.start();
	hi5.start();
	
	System.out.println("Thread 1 is alive : " + hi1.t.isAlive());
	System.out.println("Thread 2 is alive : " + hi2.t.isAlive());
	System.out.println("Thread 3 is alive : " + hi3.t.isAlive());
	System.out.println("Thread 4 is alive : " + hi4.t.isAlive());
	System.out.println("Thread 5 is alive : " + hi5.t.isAlive());
	
	try
	{
		hi3.t.sleep(1000);
		hi5.t.sleep(1000);
	}
	catch(InterruptedException e)
	{
		System.out.println("Maint thread is interrupted");
	}
	hi1.stop();
	hi2.stop();
	hi3.stop();
	hi4.stop();
	hi5.stop();
	try
	{
		System.out.println("Waiting thread to finish...");
		hi1.t.join();
		hi2.t.join();
		hi3.t.join();
		hi4.t.join();
		hi5.t.join();
	}
	catch(InterruptedException e1)
	{
		System.out.println("Main thread is interrupted");
	}
	System.out.println("Priority of thread 1 : " + hi1.t.getPriority());
	System.out.println("Priority of thread 2 : " + hi2.t.getPriority());
	System.out.println("Priority of thread 3 : " + hi3.t.getPriority());
	System.out.println("Priority of thread 4 : " + hi4.t.getPriority());
	System.out.println("Prioirty of thread 5 : " + hi5.t.getPriority());
	
	System.out.println("Thread 1 is alive : " + hi1.t.isAlive());
	System.out.println("Thread 2 is alive : " + hi2.t.isAlive());
	System.out.println("Thread 3 is alive : " + hi3.t.isAlive());
	System.out.println("Thread 4 is alive : " + hi4.t.isAlive());
	System.out.println("Thread 5 is alive : " + hi5.t.isAlive());
}
}