zxjframe.java

哲学家就餐是一个经典的Java多线程编程的实例

import java.awt.*;                   
import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.ImageIcon;


//////////////////////////////////////////////////
//筷子类 
class Bamboo {                   
   boolean bState;               //互斥信号量
   JLabel bLabel;                       //显示筷子的JLabel
   ImageIcon emptyImage,bambooImage;                //被用时为empty图片，否则为筷子图片   
   
   public Bamboo(JLabel bLabel, ImageIcon image) {      
       emptyImage=new ImageIcon("空的.jpg"); 
       this.bLabel=bLabel;   
       this.bambooImage=image; 
       bState=true;                    //一开始都设筷子为可用状态
   } 
   
   public synchronized void gainBamboo() {           
       while(!bState) {                  //如果此筷子已被用，则等待    
           try { 
               wait(); 
           }catch(Exception e) { 
        	   e.printStackTrace();
           } 
       } 
       bLabel.setIcon(emptyImage);         //获得筷子，并把筷子所代表 的图片设为空      
       bState=false;                      //把此筷子的状态设为已被用了        
   } 
   
   public synchronized void takeBamboo() {          //放下筷子，把筷子状态设为可用
       bState=true;                   
       bLabel.setIcon(bambooImage);                  
       notify();                             //唤醒其他在等待的线程，如果有等待此筷子的线程，则可以继续判断
   } 
} 
 
//////////////////////////////////////////////////////////
//哲学家类，
class Zexuejia extends Thread {       


	int thinkSpeed, eatSpeed; // 思考，吃饭的时间

	Bamboo left, right; // 哲学家的左右筷子

	int num; // 第几号哲学家

	JLabel zxjLable, leftLable, rightLable, zxjLeftLabel, zxjRightLabel;  // zxjLable为哲学家设置状态的，
                                                                         // leftLable,rightLable,为哲学家的左右两根，
	                                                                    // zxjLeftLabel,zxjRightLabel为哲学家拿起两筷子后的

	ImageIcon leftImage, rightImage;     //左右两个筷子的图片

	Zexuejia(int num, JLabel zLabel, Bamboo left, JLabel lLabel,
			Bamboo right, // 哲学家构造函数
			JLabel rLabel, ImageIcon lImage, ImageIcon rImage, JLabel zLLabel,
			JLabel zRLabel) {
		this.num = num;
		this.zxjLable = zLabel;
		this.left = left;
		this.leftLable = lLabel;
		this.right = right;
		this.rightLable = rLabel;
		this.leftImage = lImage;
		this.rightImage = rImage;
		this.zxjRightLabel = zRLabel;
		this.zxjLeftLabel = zLLabel;
	
	} 
   public void run() {
		ImageIcon thinkImage = new ImageIcon("thinking.gif");
		ImageIcon huangryImage = new ImageIcon("huangry.gif");
		ImageIcon eatImage = new ImageIcon("eating.gif");
		ImageIcon empty = new ImageIcon("empty.jpg");
		while (true) {
			
			zxjLable.setIcon(thinkImage);
	
			do {
				thinkSpeed = (int) (Math.random() * 10000); // 获得随机的思考时间
			} while (thinkSpeed < 1500);
			try {
				sleep(thinkSpeed); // 以线程睡眠的方式让哲学家思考一些时间
			} catch (Exception e) {
			}
			zxjLable.setIcon(huangryImage);
			left.gainBamboo(); // 获得左边的筷子
			zxjLeftLabel.setIcon(leftImage);
			right.gainBamboo(); // 获得右边的筷子
			zxjRightLabel.setIcon(rightImage);
			
			zxjLable.setIcon(eatImage);
			do {
				eatSpeed = (int) (Math.random() * 10000); // 获得随机的吃饭时间
			} while (eatSpeed < 1500);
			try {
				sleep(eatSpeed); // 以线程睡眠的方式让哲学家吃饭一些时间
			} catch (Exception e) {
			}
			synchronized (left) {
				left.takeBamboo(); // 放下左边的筷子
				zxjLeftLabel.setIcon(empty);
			}
			synchronized (right) {
				right.takeBamboo(); // 放下右边的筷子
				zxjRightLabel.setIcon(empty);
			}
		}
	} 
} 

public class ZxjFrame extends JFrame implements ActionListener {    
   JButton start_Button,end_Button;      
   JLabel bambooLabel[]; 
   JLabel h[]; 
   JLabel zxjLable[]; 
   Bamboo bamboo[];           // 筷子对象数组
   Zexuejia zxj[];       // 哲学家对象数组
   ImageIcon bambooImage[],empty,thinkImage,huangryImage,eatImage; 
   ZxjFrame() 
   {           // 构造函数
       super("---经典哲学家就餐问题模拟---周辉强－－3105007364－－软件工程（3）班----");           
       this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       Container ct=this.getContentPane(); 
       ct.setBackground(java.awt.Color.WHITE); 
           
       thinkImage=new ImageIcon("thinking.gif"); 
       huangryImage=new ImageIcon("huangry.gif"); 
       eatImage=new ImageIcon("eating.gif"); 
       empty=new ImageIcon("空的.gif"); 
       JPanel panel=new JPanel(); 
       panel.setLayout(new FlowLayout()); 

       
       zxjLable=new JLabel[6]; 
       for(int i=1;i<=5;i++) { 
           zxjLable[i]=new JLabel(); 
           zxjLable[i].setIcon(thinkImage);   //一开始设为思考 
       } 
               
       bambooImage=new ImageIcon[6]; 
       bambooImage[1]=new ImageIcon("bamboo.gif"); 
       bambooImage[2]=new ImageIcon("bamboo.gif"); 
       bambooImage[3]=new ImageIcon("bamboo.gif"); 
       bambooImage[4]=new ImageIcon("bamboo.gif"); 
       bambooImage[5]=new ImageIcon("bamboo.gif"); 
       
       bambooLabel=new JLabel[6]; 
       bambooLabel[1]=new JLabel(); bambooLabel[1].setIcon(bambooImage[1]); 
       bambooLabel[2]=new JLabel(); bambooLabel[2].setIcon(bambooImage[2]); 
       bambooLabel[3]=new JLabel(); bambooLabel[3].setIcon(bambooImage[3]); 
       bambooLabel[4]=new JLabel(); bambooLabel[4].setIcon(bambooImage[4]); 
       bambooLabel[5]=new JLabel(); bambooLabel[5].setIcon(bambooImage[5]); 
       
       bamboo=new Bamboo[6];       
       for(int i=1;i<=5;i++) bamboo[i]=new Bamboo(bambooLabel[i],bambooImage[i]);   //筷子对象的初始化 
       
       h=new JLabel[13]; 
       for(int i=1;i<=12;i++) { 
           h[i]=new JLabel(); 
           h[i].setIcon(empty); 
       } 
       
       zxj=new Zexuejia[6];       
       
       panel=new JPanel();          
       panel.setLayout(new GridBagLayout()); 
       //GridBagLayout 类是一个灵活的布局管理器，
       //它不要求组件的大小相同即可将组件垂直和水平对齐。
       //每个 GridBagLayout 对象维持一个动态的矩形单元网格，
       //每个组件占用一个或多个这样的单元，称为显示区域。
       
       GridBagConstraints gbc=new GridBagConstraints(); 
       //GridBagConstraints 类指定使用 GridBagLayout 类布置的组件的约束。
       //详细见E盘api
       gbc.weightx=1;   gbc.weighty=1; 
       gbc.gridwidth=1;   gbc.gridheight=1; 
       gbc.gridy=0; 
       gbc.gridx=4;   panel.add(h[2],gbc); 
       gbc.gridx=6;   panel.add(h[1],gbc); 
       gbc.gridy=1;   
       gbc.gridx=5;   panel.add(zxjLable[1],gbc); 
       gbc.gridy=2; 
       gbc.gridx=0;   panel.add(h[3],gbc); 
       gbc.gridx=3;   panel.add(bambooLabel[1],gbc); 
       gbc.gridx=7;   panel.add(bambooLabel[5],gbc); 
       gbc.gridx=10;   panel.add(h[10],gbc); 
       gbc.gridy=3; 
       gbc.gridx=1;   panel.add(zxjLable[2],gbc); 
       gbc.gridx=9;   panel.add(zxjLable[5],gbc); 
       gbc.gridy=4; 
       gbc.gridx=0;   panel.add(h[4],gbc); 
       gbc.gridx=10;   panel.add(h[9],gbc); 
       gbc.gridy=5; 
       gbc.gridx=2;   panel.add(bambooLabel[2],gbc); 
       gbc.gridx=8;   panel.add(bambooLabel[4],gbc); 
       gbc.gridy=7; 
       gbc.gridx=2;   panel.add(h[5],gbc); 
       gbc.gridx=3;   panel.add(zxjLable[3],gbc); 
       gbc.gridx=7;   panel.add(zxjLable[4],gbc); 
       gbc.gridx=8;   panel.add(h[8],gbc); 
       gbc.gridy=8; 
       gbc.gridx=3;   panel.add(h[6],gbc); 
       gbc.gridx=5;   panel.add(bambooLabel[3],gbc); 
       gbc.gridx=7;   panel.add(h[7],gbc); 
       ct.add(panel,BorderLayout.CENTER); 
       
       zxj[1]=new Zexuejia(1, zxjLable[1], bamboo[5], bambooLabel[5],            
               bamboo[1], bambooLabel[1], bambooImage[5], bambooImage[1], h[1], h[2]); 
       zxj[2]=new Zexuejia(2, zxjLable[2], bamboo[2], bambooLabel[2], 
               bamboo[1], bambooLabel[1], bambooImage[2], bambooImage[1], h[4], h[3]); 
       zxj[3]=new Zexuejia(3, zxjLable[3], bamboo[2], bambooLabel[2], 
               bamboo[3], bambooLabel[3], bambooImage[2], bambooImage[3], h[5], h[6]); 
       zxj[4]=new Zexuejia(4, zxjLable[4], bamboo[4], bambooLabel[4], 
               bamboo[3], bambooLabel[3], bambooImage[4], bambooImage[3], h[8], h[7]); 
       zxj[5]=new Zexuejia(5, zxjLable[5], bamboo[4], bambooLabel[4], 
               bamboo[5], bambooLabel[5], bambooImage[4], bambooImage[5], h[9], h[10]); 
       
       start_Button=new JButton("开始");               
       start_Button.setEnabled(true); 
       start_Button.addActionListener(this); 
       end_Button=new JButton("关闭"); 
       end_Button.addActionListener(this); 
       panel=new JPanel(new FlowLayout()); 
       panel.add(start_Button); 
       panel.add(end_Button); 
       ct.add(panel,BorderLayout.SOUTH); 
   } 
   
   public void actionPerformed(ActionEvent e) { // 图形按钮的监听函数，监听按钮
		if (e.getSource() == start_Button) {
			for (int i = 1; i <= 5; i++)
				zxj[i].start(); // 启动线程
			start_Button.setEnabled(false);
		} else if (e.getSource() == end_Button) {
			System.exit(0);
		}
	} 

   public static void main(String[] args) {
	   ZxjFrame f = new ZxjFrame();
		f.setSize(720, 550);
		f.setVisible(true);
	} 
}