prioritydemo.java

我学习JAVA时的一些练习,可以供初学者使用

import javax.swing.JOptionPane;

class Priority implements Runnable
{
	int runtimes=0;
	private boolean running=true;
	Thread thread;
	
	public Priority(int p)
	{
		thread=new Thread(this);
		thread.setPriority(p);
	}
	public void run(){
		while (running)
		  runtimes++;
	}
	public void stop()
	{
		running=false;
	}
	public void start()
	{
		thread.start();
	}
}


class PriorityDemo{
	public static void main(String args[])
	{
		Priority hpThread,lpThread;
		String output;
		
		Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
		hpThread=new Priority(Thread.MAX_PRIORITY-1);
		lpThread=new Priority(Thread.MIN_PRIORITY+2);
		
		hpThread.start();
		lpThread.start();
		
		try{
			Thread.sleep(5000);
		}
		catch(InterruptedException e)
		{
			System.out.println(e.getMessage());
		}
		
		hpThread.start();
		lpThread.start();
		
		try{
			hpThread.thread.join();
			lpThread.thread.join();
		}
		catch(InterruptedException e)
		{
			System.out.println(e.getMessage());
		}
		
		output="High priority thread has run"+hpThread.runtimes+"times\n"+"Low priority thread has run"+lpThread.runtimes+"times\n";
		JOptionPane.showMessageDialog(null,output);
		System.exit(0);
	}
}