生产者消费者问题

• Z时代
• 2024-01-10
• 分类：问答

public class Main { 
public static void main(String[] args){ 
    XClass x = new XClass(); 
    ProduceX prodx = new ProduceX(x); 
    PrintX printx = new PrintX(x); 
    prodx.start(); 
    printx.start(); 
} 
} 
class XClass { 
private int x; 
private boolean produced = false; 
public XClass(){ 
    this.x = 0; 
} 
public synchronized int modifyX(){ 
    while(produced==true){ 
     try{ 
      wait(); 
     } 
     catch(InterruptedException ie){} 
    } 
    x=x+1; 
    produced = true; 
    notifyAll(); 
    return x; 
} 
public synchronized void printX(){ 
    while(produced==false){ 
     try{ 
      wait(); 
     } 
     catch(InterruptedException ie){} 
    } 
    produced = false; 
    System.out.println(Thread.currentThread().getName()+" prints "+x); 
    notifyAll(); 
} 
} 
class PrintX extends Thread{ 
private XClass x; 
public PrintX(XClass x){ 
    this.x = x; 
} 
public void printX(){ 
    for(int i=0;i<10;i++){ 
     x.printX(); 
    } 
} 
} 
class ProduceX extends Thread{ 
private XClass x; 
public ProduceX(XClass x){ 
    this.x = x; 
} 
public void run(){ 
    for(int i=0;i<10;i++){ 
     x.modifyX(); 
     System.out.println(Thread.currentThread().getName()+" increases x to "+ x.modifyX()); 
    } 
} 
} 

该问题类似于生产者消费者。这里的producex会将x增加1，并且会再次增加，直到x被printx打印。但是，似乎没有结果。错误在哪里？生产者消费者问题

回答：

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