Java 两线程交替打印奇偶数

Posted 2020-09-21 龙心七号

使用synchronized 及 Object对象的wait()和notifyAll()方法, Code如下

package com.shiwei.thread;

public class OddEvenRunable {
    private static Object lock = new Object();
    
    public static void main(String[] args) {
        PrintNumber pOdd = new PrintNumber(true, lock);
        PrintNumber pEven = new PrintNumber(false, lock);
        Thread t1 = new Thread(pOdd);
        Thread t2 = new Thread(pEven);
        t1.start();
        t2.start();
    }
}

class PrintNumber implements Runnable{
    Boolean flag;
    Object lock;
    public PrintNumber(Boolean flag, Object lock){
        this.flag = flag;
        this.lock = lock;
    }
    
    public void run() {
        for(int i=1; i< 20; i=i+2){
            
            synchronized(lock){
                
                if(flag){
                    System.out.println("a---"+i);
                }else{
                    System.out.println("b---"+(i+1));
                }
                
                lock.notifyAll();
                
                try {
                    lock.wait();
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                
            }
            
        }
    }
    
}

 

I. synchronized 锁住的是对象

//@TODO

II. Object wait(), notify() 和notifyAll()

//@TODO