notify() 放在else代码块，没效果....

来源：7-7 交替打印

qq_改成什么名字呢_0

2019-10-18

package com.company;

public class Test1 {

private static   int count =100;
private  static volatile Integer dqCount = 0;
public static void main(String[] args) {
    Thread thread = new Test1.Oushu();
    Thread thread1 = new Test1.Qishu();
    thread.start();
    thread1.start();
}
static class Oushu extends  Thread{
     @Override
     public void run() {
                while(dqCount<=count){
            synchronized (dqCount) {
				//   dqCount.notify(); //放在这里可以
                if (dqCount % 2 == 0) {
                    System.out.println("偶数函数打印 :" + dqCount);
                    dqCount++;
                } else {
                    try {
                        dqCount.notify();
                        dqCount.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
     }
 }

 static  class Qishu extends Thread{
     @Override
     public void run() {
         while(dqCount<=count){
             synchronized (dqCount) {
             //   dqCount.notify(); //放在这里可以
                 if (dqCount % 2 != 0) {
                     System.out.println("奇数函数打印 :" + dqCount);
                     dqCount++;
                 } else {
                     try {
                         dqCount.notify();
                         dqCount.wait();
                     } catch (InterruptedException e) {
                         e.printStackTrace();
                     }
                 }

             }
         }

         }
 }

}

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1回答

悟空

2019-10-18

已采纳

你用的锁对象不是不可变的，会出问题。用new Object()作为锁，就可以了：

public class QQ {

    private static int count = 100;
    private static volatile Integer dqCount = 0;
    private static Object lock = new Object();

    public static void main(String[] args) {
        Thread thread = new QQ.Oushu();
        Thread thread1 = new QQ.Qishu();
        thread.start();
        thread1.start();
    }

    static class Oushu extends Thread {

        @Override
        public void run() {
            while (dqCount <= count) {
                synchronized (lock) {
                    //   dqCount.notify(); //放在这里可以
                    if (dqCount % 2 == 0) {
                        System.out.println("偶数函数打印 :" + dqCount);
                        dqCount++;
                    } else {
                        try {
                            lock.notify();
                            lock.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }
    }

    static class Qishu extends Thread {

        @Override
        public void run() {
            while (dqCount <= count) {
                synchronized (lock) {
                    //   dqCount.notify(); //放在这里可以
                    if (dqCount % 2 != 0) {
                        System.out.println("奇数函数打印 :" + dqCount);
                        dqCount++;
                    } else {
                        try {
                            lock.notify();
                            lock.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }

                }
            }

        }
    }
}

qq_改成什么名字呢_0

非常感谢！

2019-10-18

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