这是类(Class)哲学家
public class Filosofo implements Runnable{
public String nome = null;
public static Bacchetta[] bacchette = new Bacchetta[5]; //this should be the resource
public Bacchetta bacchettaDX; //right resource
public Bacchetta bacchettaSX; //left resource
public static int indice = 0;
public int x[] = {};
public int y[] = {};
public JButton filosofo = new JButton(); //Button associated to the philos.
public Filosofo(String nome, int SX, int DX){
indice++;
for(int i = 0; i<5; i++){
bacchette[i] = new Bacchetta();
}
this.nome = nome;
this.bacchettaSX = bacchette[SX];
this.bacchettaDX = bacchette[DX];
}
@Override
public synchronized void run() {
Random r = new Random();
int random;
while(true){
random = (int) r.nextInt(100);
pensa(5000);
random = (int) r.nextInt(100);
mangia(5000);
}
}
//the method mangia means the phil. is eating, so has both chopsticks
public synchronized void mangia(int tempo){
do{
if(!bacchettaSX.isOccupied){
bacchettaSX.isOccupied = true;
bacchettaSX.setChiOccupa(this.nome);
}
if(!bacchettaDX.isOccupied){
bacchettaDX.isOccupied = true;
bacchettaDX.setChiOccupa(this.nome);
}
}while(bacchettaSX.getChiOccupa().compareTo(this.nome) != 0 && bacchettaDX.getChiOccupa().compareTo(this.nome) != 0);
this.filosofo.setBackground(Color.GREEN);
try {
sleep(1000);
} catch (InterruptedException ex) {
Logger.getLogger(Filosofo.class.getName()).log(Level.SEVERE, null, ex);
}
System.out.println("\t\t\t" + this.nome + " sta mangiando");
int a = 0;
/*for(long i = 0; i<1000000000; i++){
a++;
}*/
bacchettaSX.isOccupied = false;
bacchettaDX.isOccupied = false;
bacchettaSX.setChiOccupa(null);
bacchettaDX.setChiOccupa(null);
System.out.println("\t\t\t\t\t\t" + this.nome + " ha finito di mangiare");
this.filosofo.setBackground(Color.BLUE);
}
//the method pensa means the philosopher is no longer eating
public void pensa(int tempo){
System.out.println(this.nome + " sta ponderando");
try {
sleep(tempo);
} catch (InterruptedException ex) {
Logger.getLogger(Filosofo.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
应该在终端上打印出正在做什么，问题是他们应该一个一吃，或者在最佳情况下最多吃两个哲学家。但是，他们一起吃。同步未完成应做的工作。问题出在哪儿？
最佳答案
您的代码块
for(int i = 0; i<5; i++){
bacchette[i] = new Bacchetta();
}
每次创建新的哲学家时都要初始化静态数组，因此它们都以不同的bachettaSX和bachettaDX结尾。
在构造函数外部的静态代码块中对其进行一次初始化。
static {
for(int i = 0; i<5; i++){
bacchette[i] = new Bacchetta();
}
}
关于java - 我的五位哲学家都在同一时间吃饭，为什么呢？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30175870/