example09_moveballtime.java

这是我java课程第九章的作业,也是实现多线程的技术.

package example.ch09;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import java.util.*;

public class Example09_MoveBallTime extends JFrame implements ActionListener
{
	JMenuItem go;
	
	public Example09_MoveBallTime()
	{
		super("Thread Example");
		
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		
		go=new JMenuItem("Go",'g');
		go.addActionListener(this);
		
		JMenu menu=new JMenu("Start");
		menu.setMnemonic('S');
		menu.add(go);
		
		JMenuBar bar=new JMenuBar();
		bar.add(menu);
		setJMenuBar(bar);
		
		setVisible(true);
		setExtendedState(MAXIMIZED_BOTH);
	}
	
	public void actionPerformed(ActionEvent evt)
	{
		go.setEnabled(false);
				
		MovetextPanel movetext=new MovetextPanel();
		DispballPanel dispball=new DispballPanel();
		DisptimePanel disptime=new DisptimePanel();
		
		Box box=Box.createVerticalBox();
		box.add(movetext);
		box.add(dispball);
		box.add(disptime);
		getContentPane().add(box);
		validate();
		
		new Thread(movetext).start();
		new Thread(disptime).start();
	}
	
	public static void main(String[] args)
	{
		new Example09_MoveBallTime();
	}
}

class MovetextPanel extends JPanel implements Runnable
{
	int x;
	int step=5;
	int fsize;
	String text="You are welcome! 欢迎光临！";
	boolean move=true;
	
	public MovetextPanel()
	{
		x=0;
		setBackground(Color.blue);
		Font font=new Font("黑体",Font.PLAIN,32);
		setFont(font);
		addMouseListener(new MouseAdapter()
		{
			public void mouseEntered(MouseEvent evt)
			{
				step=0;
			}
			
			public void mouseExited(MouseEvent evt)
			{
				step=5;
			}
		});
	}
	
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		g.setColor(Color.yellow);
		fsize=g.getFontMetrics().stringWidth(text);
		g.drawString(text,x-fsize,getSize().height/2-20);
		g.drawString(text,getSize().width-x,getSize().height/2+20);
	}
	
	public void run()
	{
		while (true)
		{
			if (x>getSize().width+fsize)
			{
				x=0;
			}
			x+=step;
			repaint();
			try
			{
				Thread.sleep(50);
			}
			catch (InterruptedException e)
			{
			}
		}
	}
}

class DispballPanel extends JPanel implements Runnable,ActionListener
{
	int delay=10;
	JPanel p;
	
	Color bgcolor=new Color(255,255,255);
	
	JButton up;
	JButton down;
	JButton remain;
	JButton addball;
	JButton removeball;
	JButton randomball;
	
	int n=0;
	boolean remove=false;
	boolean random=false;
	
	public DispballPanel()
	{
		setLayout(new BoxLayout(this,BoxLayout.X_AXIS));
		
		addball=new JButton("增加");
		removeball=new JButton("减少");
		removeball.setEnabled(false);
		up=new JButton("加速");
		down=new JButton("减速");
		remain=new JButton("轨迹");
		randomball=new JButton("随机");
		
		addball.addActionListener(this);
		removeball.addActionListener(this);
		up.addActionListener(this);
		down.addActionListener(this);
		remain.addActionListener(this);
		randomball.addActionListener(this);
		
		Box buttbox=Box.createVerticalBox();
		buttbox.add(addball);
		buttbox.add(removeball);
		buttbox.add(up);
		buttbox.add(down);
		buttbox.add(remain);
		buttbox.add(randomball);
		
		p=new JPanel();
		p.setBackground(bgcolor);
		
		add(p);
		add(Box.createHorizontalStrut(10));
		add(buttbox);
		add(Box.createHorizontalStrut(10));
	}
	
	public void actionPerformed(ActionEvent evt)
	{
		if (evt.getSource()==up)
		{
			up.setEnabled(--delay!=0);
		}
		
		if (evt.getSource()==down)
		{
			up.setEnabled(++delay>0);
		}
		
		if (evt.getSource()==remain)
		{
			String text=remain.getText();
			if (text.equals("轨迹"))
			{
				remain.setText("去除");
				bgcolor=new Color(0,255,0);
			}
			else
			{
				remain.setText("轨迹");
				bgcolor=new Color(255,255,255);
			}
		}
		
		if (evt.getSource()==addball)
		{
			Thread t=new Thread(this);
			t.start();
			n++;
			removeball.setEnabled(true);
		}
		
		if (evt.getSource()==removeball)
		{
			if (n>0)
			{
				n--;
				remove=true;
			}
			if (n<=0)
			{
				removeball.setEnabled(false);
			}
		}
		
		if (evt.getSource()==randomball)
		{
			String text=randomball.getText();
			if (text.equals("随机"))
			{
				randomball.setText("规范");
				random=true;
			}
			else
			{
				randomball.setText("随机");
				random=false;
			}
		}
	}
		
	public void run()
	{
		int w=p.getSize().width;
		int h=p.getSize().height;
		int x=!random?0:(int)(Math.random()*w);
		int y=!random?0:(int)(Math.random()*h);
		int dx=!random?2:1+(int)(Math.random()*5);
		int dy=!random?2:1+(int)(Math.random()*5);
		int size=!random?20:10+(int)(Math.random()*40);
		Color forecolor=new Color((!random?255:(int)(Math.random()*255)),(!random?0:(int)(Math.random()*255)),(!random?0:(int)(Math.random()*255)));
		Graphics g=getGraphics();
	
		while (true)
		{
			if (remove)
			{
				remove=false;
				return;
			}
			x+=dx;
			y+=dy;
			if (x<0)
			{
				x=0;
				dx=-dx;
			}
			if (x+size>w)
			{
				x=w-size;
				dx=-dx;
			}
			if (y<0)
			{
				y=0;
				dy=-dy;
			}
			if (y+size>h)
			{
				y=h-size;
				dy=-dy;
			}
			g.setColor(forecolor);
			g.fillOval(x,y,size,size);
			try
			{
				Thread.sleep(delay);
			}
			catch (InterruptedException e)
			{
			}
			g.setColor(bgcolor);
			g.fillOval(x,y,size,size);
		}
	}
}

class DisptimePanel extends JPanel implements Runnable
{
	SimpleDateFormat fmt;
	
	public DisptimePanel()
	{
		fmt=new SimpleDateFormat("hh:mm:ss");
		setBackground(Color.black);
		Font font=new Font("黑体",Font.PLAIN,72);
		setFont(font);
	}
	
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		g.setColor(Color.white);
		g.drawString(fmt.format(new Date()),getSize().width/2-144,getSize().height/2);
	}
	
	public void run()
	{
		while (true)
		{
			repaint();
			try
			{
				Thread.sleep(1000);
			}
			catch (InterruptedException e)
			{
			}
		}
	}
}	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		g.setColor(Color.white);
		g.drawString(fmt.format(new Date()),getSize().width/2-144,getSize().height/2);
	}
	
	public void run()
	{
		while (true)
		{
			repaint();
			try
			{
				Thread.sleep(1000);
			}
			catch (InterruptedException e)
			{
			}
		}
	}
}