1 /*
2 * To change this template, choose Tools | Templates
3 * and open the template in the editor.
4 */
5
6 package pack1;
7
8
9 import java.awt.*;
10 import java.awt.event.ActionEvent;
11 import java.awt.event.ActionListener;
12 import java.util.*;
13 import javax.swing.*;
14 /**
15 *
16 * @author Administrator
17 */
18 public class Dinner extends JFrame {
19 public JButton jbt_begin=new JButton("Start");
20 public JButton jbt_stop=new JButton("Pause");
21 public JButton jbt_continue=new JButton("Continue");
22 public JButton jbt_end=new JButton("Exit");
23
24
25 public JPanel p_north=new JPanel(new GridLayout(1,10,2,10));
26 public JPanel p_center=new JPanel(new GridLayout(4,7,80,80));
27 public JPanel p_left=new JPanel(new GridLayout(2,1,2,2));
28 public JPanel p_right=new JPanel(new GridLayout(2,1,2,2));
29 public JPanel p_south=new JPanel(new GridLayout(3,1,2,2));
30 public JPanel null0=new JPanel();
31 public JLabel[] j=new JLabel[5];
32 public JPanel p_all=new JPanel();
33 public JLabel eat=new JLabel(" yellow message _________eating");
34 public JLabel think=new JLabel(" white message _________thinking");
35 public JLabel wait=new JLabel(" blue message _________waiting");
36 Tool tools0=new Tool(0);
37 Tool tools1=new Tool(1);
38 Tool tools2=new Tool(2);
39 Tool tools3=new Tool(3);
40 Tool tools4=new Tool(4);
41
42 People eater0=new People(0,tools0,tools1);
43 People eater1=new People(1,tools2,tools1);
44 People eater2=new People(2,tools2,tools3);
45 People eater3=new People(3,tools4,tools3);
46 People eater4=new People(4,tools4,tools0);
47 public Dinner(){
48 jbt_begin.setFont(new Font("simhei ", Font.PLAIN, 20));
49 jbt_stop.setFont(new Font("simhei ", Font.PLAIN, 20));
50 jbt_continue.setFont(new Font("simhei ", Font.PLAIN, 20));
51 jbt_end.setFont(new Font("simhei ", Font.PLAIN, 20));
52 for(int i=0;i<5;i++){
53 j[i]=new JLabel();
54 j[i].setFont(new Font("simhei ", Font.PLAIN, 20));
55
56 // j[i].setBorder (BorderFactory.createLineBorder (Color.green, 1));
57 }
58 p_center.setBackground(Color.black);
59 p_center.add(j[0]);
60 p_center.add(j[4]);
61 p_center.add(j[1]);
62 p_center.add(j[3]);
63 p_center.add(j[2]);
64
65 p_north.setBackground(Color.black);
66 p_north.add(jbt_begin);
67 p_north.add(jbt_stop);
68 p_north.add(jbt_continue);
69 p_north.add(jbt_end);
70 eat.setFont(new Font("simhei ", Font.PLAIN, 20));
71 eat.setForeground(Color.yellow);
72 think.setFont(new Font("simhei ", Font.PLAIN, 20));
73 think.setForeground(Color.white);
74 wait.setFont(new Font("simhei ", Font.PLAIN, 20));
75 wait.setForeground(Color.blue);
76 p_center.setBorder (BorderFactory.createLineBorder (Color.white, 3));
77
78 p_south.setBackground(Color.black);
79 p_south.add(eat);
80 p_south.add(think);
81 p_south.add(wait);
82
83
84 p_all.setLayout(new BorderLayout() );
85 p_all.add(p_north,BorderLayout.NORTH);
86 p_all.add(p_center,BorderLayout.CENTER);
87 p_all.add(p_left,BorderLayout.WEST);
88 p_all.add(p_right,BorderLayout.EAST);
89 p_all.add(p_south,BorderLayout.SOUTH);
90 this.add(p_all);
91
92
93 //////////////////////////////////////////////////////////////////////
94
95 ActionListener listener1=new Begin_Listener();
96 ActionListener listener2=new Stop_Listener();
97 ActionListener listener4=new Continue_Listener();
98 ActionListener listener3=new Exit_Listener();
99 jbt_begin.addActionListener(listener1);
100 jbt_stop.addActionListener(listener2);
101 jbt_continue.addActionListener(listener4);
102 jbt_end.addActionListener(listener3);
103 ///////////////////////////////////////////////////////////////////
104
105
106
107
108 }////
109 class Begin_Listener implements ActionListener{
110
111 public void actionPerformed(ActionEvent e) {
112
113 ///////////////////////////////////////////////////////////////////////
114
115 eater0.start();//开始
116 eater1.start();
117 eater2.start();
118 eater3.start();
119 eater4.start();
120 }
121 }
122 class Stop_Listener implements ActionListener {
123
124 public void actionPerformed(ActionEvent e) {
125
126
127 // eater0.setflag_false();
128 // eater1.setflag_false();
129 // eater2.setflag_false();
130 // eater3.setflag_false();
131 // eater4.setflag_false();
132 eater0.suspend(); //暂停
133 eater1.suspend();
134 eater2.suspend();
135 eater3.suspend();
136 eater4.suspend();
137
138 }
139
140 }
141 ///////////////////////////////////////////////////////////////////////
142 class Continue_Listener implements ActionListener{
143
144 public void actionPerformed(ActionEvent e) {
145 eater0.resume(); //恢复
146 eater1.resume();
147 eater2.resume();
148 eater3.resume();
149 eater4.resume();
150
151 }
152 }
153
154 class Exit_Listener implements ActionListener {
155
156 public void actionPerformed(ActionEvent e) {
157 System.exit(0); //结束
158 }
159
160 }
161
162
163 //public void begin(){
164
165 // }
166
167 public static void main(String[] args) {
168 try {
169 UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());//尝试使用系统外观
170 } catch (Exception e) {
171 System.err.println("不能使用系统外观");
172 }
173 Dinner dinnerframe=new Dinner();
174 dinnerframe.setTitle("哲学家就餐问题");
175 dinnerframe.setSize(900,700);
176 dinnerframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
177 dinnerframe.setLocationRelativeTo(null);
178 dinnerframe.setVisible(true);
179 }
180 //////////////////////////////////////////////////////////////
181
182 public class Tool {
183 int Tool_name;
184 boolean available;
185 public Tool(int name){
186 this.Tool_name=name;
187 available=true;
188 }
189
190 public int getname(){
191 return Tool_name;
192 }
193 public synchronized void takeup(int p) { //鎷胯捣鍔ㄤ綔
194 while (!available) {
195 try {
196
197 wait();
198
199 j[p].setForeground(Color.blue);
200 j[p].setText(" 哲学家"+(p+1)+": is waiting for 筷子 "+Tool_name);
201
202
203 } catch (InterruptedException e) {
204 e.printStackTrace();
205 }
206 }
207 available = false;
208 }
209
210 public synchronized void putdown() {
211 available = true;
212 notify(); //唤醒等待队列中的一个线程
213 }
214
215
216 }
217 public class People extends Thread{
218 private int People_name;
219 private Tool left_Tool;
220 private Tool right_Tool;
221 private Random random=new Random();
222 public People(){
223
224 }
225 public People(int name,Tool left,Tool right){
226 this.People_name=name;
227 this.left_Tool=left;
228 this.right_Tool=right;
229 }
230
231 public int getname(){
232 return People_name;
233 }
234
235 public void eating(){
236
237 this.left_Tool.takeup(this.People_name);
238 this.right_Tool.takeup(this.People_name);
239 int s1=this.left_Tool.getname()+1;
240 int s2=this.right_Tool.getname()+1;
241 j[People_name].setForeground(Color.red);
242 j[People_name].setText(" 哲学家 "+(this.People_name+1)+": is eating...using 筷子（"+s1+" and "+s2+")");
243
244
245 }
246
247 public void thinking(){
248 this.left_Tool.putdown();
249 this.right_Tool.putdown();
250 j[People_name].setForeground(Color.white);
251 j[People_name].setText(" 哲学家 "+(this.People_name+1)+": is thinking....");
252
253 }
254 @Override
255
256
257
258 public void run() //多线程的实现方法run（）
259
260 {
261 try{
262
263 sleep(random.nextInt(3));
264
265 }
266
267 catch(InterruptedException e){}
268
269 while (true){
270 thinking();
271 try {
272 sleep(1000);
273 } catch (InterruptedException e) {
274 }
275
276 eating();
277 try {
278 sleep(3000);
279 } catch (InterruptedException e) {
280 }
281
282 }
283
284 }
285
286 }
287 }
288
1.在这里，为了解决存在的死锁问题，我规定了名字为偶数号的哲学家先拿起右手的筷子，然后再拿起左手的筷子，从而不会出现每个哲学家都在等等右边的筷子这种死锁状态。
2.定义Tool类和Peope类，Tool类中的拿起筷子和放下筷子操作为对应的pv操作，通过布尔型变量作为信号量，从而给临界资源的访问设置了限制，当临界资源被一进程访问时，其他待进入的进程进入等待队列。
