package tianya.cn.philopherfood;
public class Chopstick {
private static int count = 0;
private int number = count++;
public String toString(){
return "Chopstick" + number;
}
}
===========================================
package tianya.cn.philopherfood;
import java.util.Random;
public class Philosopher extends Thread {
private static Random random = new Random();
private static int count = 0;
private int number = count++;
private Chopstick leftChopstick;
private Chopstick rightChopstick;
public static int ponder = 0;//package access,time of philosopher thinking
public Philosopher(Chopstick left, Chopstick right){
leftChopstick = left;
rightChopstick = right;
start();
}
public void thinking(){
System.out.println();
if(ponder > 0){
try {
sleep(random.nextInt(ponder));
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public void eat(){
synchronized (leftChopstick) {
System.out.println(this + " has " + this.leftChopstick + " waitting for " + this.rightChopstick);
}
synchronized (rightChopstick) {
System.out.println(this + "eating");
}
}
public String toString(){
return "Philospher" + number;
}
public void run(){
while(true){
thinking();
eat();
}
}
}
==========================================================
package tianya.cn.main;
import java.util.Timer;
import java.util.TimerTask;
import tianya.cn.philopherfood.Chopstick;
import tianya.cn.philopherfood.Philosopher;
public class DiningPhilosophers {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
if( args.length < 3){
System.err.println("輸入參數錯誤！。。。。。。。");
System.exit(0);
}
Philosopher[] philosopher = new Philosopher[ Integer.parseInt(args[0]) ];
Philosopher.ponder = Integer.parseInt( args[1] );
Chopstick
left = new Chopstick(),
right = new Chopstick(),
first = left;
int i = 0;
if(i < philosopher.length - 1){
philosopher[i++] = new Philosopher(left, right);
left = right;
right = new Chopstick();
}
if(args[2].equals("deadlock")){
philosopher[i] = new Philosopher(left, first);
}else{
//swaping values prevents deadblock
philosopher[i] = new Philosopher(first, left);
}
//
if(args.length > 3){
int delay = Integer.parseInt( args[3] );
new Timer().schedule(new TimerTask() {
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("OVER!!!");
System.exit(0);
}
}, delay);
}
}
}