同步例子-火车票

package com.pakage.ThreadAndRunnable;

public class Runnable_demo implements Runnable{
    private int ticket=10;
    public Runnable_demo(){        
    }
    @Override
    public void run() {
        for(int i=0;i<20;i++){
                if(this.ticket>0){
                    //休眠1s秒中，为了使效果更明显，否则可能出不了效果
                    try {
                        Thread.sleep(1000);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    this.sale();
                }
            
        }
    }
    
    public synchronized void sale(){
        if(this.ticket>0){
            System.out.println(Thread.currentThread().getName()+"号窗口卖出："+this.ticket--+"号票");
        }
    }
    
     public static void main(String args[]){
         Runnable_demo demo=new Runnable_demo();
         //基于火车票创建三个窗口
         new Thread(demo,"a").start();
         new Thread(demo,"b").start();
         new Thread(demo,"c").start();
     }
    
}

程序的输出结果为：

2、使用同步块修改上面的例子：

package com.pakage.ThreadAndRunnable;

public class Runnable_demo implements Runnable{
    private int ticket=10;
    public Runnable_demo(){        
    }
    @Override
    public void run() {
        for(int i=0;i<20;i++){
            synchronized(this){
                if(this.ticket>0){
                    //休眠1s秒中，为了使效果更明显，否则可能出不了效果
                    try {
                        Thread.sleep(1000);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    System.out.println(Thread.currentThread().getName()+"号窗口卖出："+this.ticket--+"号票");
                }
            }
            
        }
    }
    
     public static void main(String args[]){
         Runnable_demo demo=new Runnable_demo();
         //基于火车票创建三个窗口
         new Thread(demo,"a").start();
         new Thread(demo,"b").start();
         new Thread(demo,"c").start();
     }
    
}

程序的输出结果：