package notepad;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class ThreadDemo extends JFrame implements ActionListener,Runnable {
	JPanel pnlMain;
	JButton btnStart,btnSleep,btnSuspend,btnExit;
	JLabel lblTime;
	Date date;
	Thread thread;
	GregorianCalendar gcCalendar;
	public ThreadDemo()
	{
		
		
		pnlMain=new JPanel(new FlowLayout());
		btnStart=new JButton("開始");
		btnSleep=new JButton("睡眠");
		btnSuspend=new JButton("掛起");
		btnExit=new JButton("結束");
		btnSleep.setEnabled(false);
		btnSuspend.setEnabled(false);
		btnExit.setEnabled(false);
		lblTime=new JLabel("線程尚未開始");
		lblTime.setFont(new Font("宋體",Font.PLAIN,25));
		lblTime.setForeground(Color.red);
	
		setContentPane(pnlMain);
		pnlMain.add(lblTime);
		pnlMain.add(btnStart);
		pnlMain.add(btnSleep);
		pnlMain.add(btnSuspend);
		pnlMain.add(btnExit);
		this.setSize(250,200);
		this.setVisible(true);
		this.setResizable(false);
		this.setDefaultCloseOperation(3);
		//組件事件
		btnStart.addActionListener(this);
		btnSleep.addActionListener(this);
		btnSuspend.addActionListener(this);
		btnExit.addActionListener(this);
		
	}
	public void run()
	{
		
		while(thread!=null)
			displayTime();
	}
	@Override
	
	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
		Object o=e.getSource();
		if(o==btnStart)
		{
			thread=new Thread(this);
			thread.start();
			btnSleep.setEnabled(true);
			btnSuspend.setEnabled(true);
			btnExit.setEnabled(true);
		}
		if(o==btnSleep)
		{
			
				try
				{
					thread.sleep(1000);
				}
				catch(InterruptedException ie)
				{
					JOptionPane.showMessageDialog(null, "線程出錯");
				}
			
		}
		if(e.getActionCommand()=="掛起")
		{
			thread.suspend();
			btnSuspend.setText("重啟");
		}
		else if(e.getActionCommand()=="重啟")
		{
			thread.resume();
			btnSuspend.setText("掛起");
		}
		if(o==btnExit)
			thread.stop();
	}
	public void displayTime()
	{
		
		gcCalendar=new GregorianCalendar();
		gcCalendar.setTime(date);
		String strTime;
		strTime="當前時間:"+gcCalendar.get(Calendar.HOUR)+":"+
		gcCalendar.get(Calendar.MINUTE)+":"+gcCalendar.get(Calendar.SECOND);
		lblTime.setText(strTime);
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new ThreadDemo();
	}

}