多线程重写run方法出错

qwuiop789 发表于 2015-4-30 21:20

本帖最后由 qwuiop789 于 2015-5-1 07:43 编辑

package com.dd.qn;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class ticketsimplements Runnable{
   private int tickets=0;
   private Lock lock = new ReentrantLock();
   @Override
   publicvoid run() {

            Boolean flag =true;
            while(flag){
         if(tickets<100){
                     tickets=tickets+1;
                     System.out.println(Thread.currentThread().getName()+"卖出第"+tickets+"张票");
            }
            else{
                     flag =false;
            }
            lock.unlock();
            try {
                     Thread.sleep(100);
            } catch (InterruptedException e) {
                     e.printStackTrace();
            }
   }
   }

}
public       class beijing2008{
   public static void main(String[] args) {
            tickets to=new tickets();
            Thread w1=new Thread(to);
            w1.setName("售票点1");
            w1.start();
            Thread w2=new Thread(to);
            w2.setName("售票点2");
            w2.start();
            Thread w3=new Thread(to);
            w3.setName("售票点3");
            w3.start();
            Thread w4=new Thread(to);
            w4.setName("售票点4");
            w4.start();
            Thread w5=new Thread(to);
            w5.setName("售票点5");
            w5.start();

   }
}

把多个类写在同一个*.class类文件中，这种写法叫什么写法？【看上面蓝色部分代码】。

qwuiop789 发表于 2015-4-30 21:21

售票点1卖出第1张票Exception in thread "售票点3" java.lang.IllegalMonitorStateException

售票点3卖出第3张票
售票点2卖出第2张票
售票点4卖出第5张票
售票点5卖出第4张票
at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:127)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1175)
at java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:431)
at com.dd.qn.tickets.run(beijing2008.java:21)
at java.lang.Thread.run(Thread.java:619)
Exception in thread "售票点1" java.lang.IllegalMonitorStateException
at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:127)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1175)
at java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:431)
at com.dd.qn.tickets.run(beijing2008.java:21)
at java.lang.Thread.run(Thread.java:619)
Exception in thread "售票点5" java.lang.IllegalMonitorStateException
at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:127)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1175)
at java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:431)
at com.dd.qn.tickets.run(beijing2008.java:21)
at java.lang.Thread.run(Thread.java:619)
Exception in thread "售票点4" java.lang.IllegalMonitorStateException
at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:127)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1175)
at java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:431)
at com.dd.qn.tickets.run(beijing2008.java:21)
at java.lang.Thread.run(Thread.java:619)
Exception in thread "售票点2" java.lang.IllegalMonitorStateException
at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:127)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1175)
at java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:431)
at com.dd.qn.tickets.run(beijing2008.java:21)
at java.lang.Thread.run(Thread.java:619)

速皮尔 发表于 2015-4-30 21:34

Java的么？

qwuiop789 发表于 2015-5-1 07:35

速皮尔发表于 2015-4-30 21:34
Java的么？

对啊。我解决问题了，线程同步时使用对象锁：忘了加锁，lock.lock。但有解锁，lock.unlock。

qwuiop789 发表于 2015-5-1 07:37

if(tickets<100){,后面加锁：lock.lock。

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多线程重写run方法出错