import java.awt.*;
import java.awt.event.*;
public class GuiThread 
{
	public static void main(String args[]) throws Exception
	{
		Frame f=new Frame();
		Button b=new Button("Press me");
		myListener m=new myListener();
		b.addActionListener(m);
		f.add(b,"Center");
		f.setSize(100,60);
		f.setVisible(true);
		f.addWindowListener(m);
		myThread.view();
	}
}
class myListener extends WindowAdapter implements ActionListener
{
	public void actionPerformed(ActionEvent e)
	{
		myThread.view();
	}
	public void windowClosing(WindowEvent we)
	{
		
		myThread.view();
		System.exit(0);
	}
}
class myThread{
	public static void view()
	{
		Thread t=Thread.currentThread();
		System.out.println("當前線程:"+t.getName());
		int n=Thread.activeCount();
		System.out.println("活動線程個數:"+n);
		Thread threads[]=new Thread[n];
		t.enumerate(threads);// 枚舉數組
		for(Thread thread:threads)
		{
			String s=thread.isDaemon()?"后臺線程":"前臺線程";
			System.out.println(s+":"+thread.getName());
		}
		System.out.println("---------------------");
	}
}