我今天有一个学校作业来模拟哲学家进餐问题。
我刚刚编写了这段代码来测试它是否以这种简单的方式工作（A）。我现在遇到的问题是，当一个不应该吃东西的人开始吃东西时。这意味着当筷子被拿走时，他无论如何都会开始吃东西......请给我提示:)这是代码：
import java.util.*;
public class OperatingSystem implements Runnable {
int namn; // thread name
int tal; // the random number
Random rand = new Random(); // implements random
boolean chopstick1 = true;
boolean chopstick2 = true;
boolean chopstick3 = true;
boolean chopstick4 = true;
boolean chopstick5 = true;
public OperatingSystem(int x){ // constructor
namn = x;
tal = rand.nextInt(30000);
}
public void think() { // run method
try{
System.out.println(namn + ": " + tal+ " ms");
Thread.sleep(tal);
System.out.println(namn + " is done thinking!");
}catch(Exception e){}
}
public void hungry(){
while(true){
// System.out.println(namn);
if(namn == 1){
if((chopstick1==true) && (chopstick2==true)){
chopstick1 = false;
chopstick2 = false;
break;
}
}
else if(namn == 2){
if((chopstick2==true) && (chopstick3==true)){
chopstick2 = false;
chopstick3 = false;
break;
}
}
else if(namn == 3){
if((chopstick3==true) && (chopstick4==true)){
chopstick3 = false;
chopstick4 = false;
break;
}
}
else if(namn == 4){
if((chopstick4==true) && (chopstick5==true)){
chopstick4 = false;
chopstick5 = false;
break;
}
}
else if(namn == 5){
if((chopstick5==true) && (chopstick1==true)){
chopstick5 = false;
chopstick1 = false;
break;
}
}
}
}
public void eat() { // run method
try{
tal = rand.nextInt(30000);
System.out.println(namn + " is eating");
Thread.sleep(tal);
System.out.println(namn + " is done eating!");
/* chopstick2 = true;
chopstick3 = true;
chopstick4 = true;
chopstick5 = true;
chopstick1 = true;
*/
if(namn == 1){
chopstick1 = true;
chopstick2 = true;
}
else if(namn == 2){
chopstick2 = true;
chopstick3 = true;
}
else if(namn == 3){
chopstick3 = true;
chopstick4 = true;
}
else if(namn == 4){
chopstick4 = true;
chopstick5 = true;
}
else if(namn == 5){
chopstick5 = true;
chopstick1 = true;
}
}catch(Exception e){}
}
@Override
public void run() {
think();
hungry();
eat();
}
}
///////////////////////////////// here comes the main;
import java.util.*;
public class OperatingSystemMain {
public static void main(String[] args) {
Thread t1 = new Thread(new OperatingSystem(1));
Thread t2 = new Thread(new OperatingSystem(2));
Thread t3 = new Thread(new OperatingSystem(3));
Thread t4 = new Thread(new OperatingSystem(4));
Thread t5 = new Thread(new OperatingSystem(5));
t1.start();
t2.start();
t3.start();
t4.start();
t5.start();
}
}