线程：售票小测试

叁歲伎倆 2021-09-18 22:32 268阅读 0赞

### 情景一：四个窗口各售票100张。 ###

**代码实现：**

class Ticket extends Thread 
    {
    	public int ticket=100;
    	
    	Ticket(String name){
    		super(name);
    	}
    	public void run(){
    		while(true){
    			if(ticket>0){
    				System.out.println(this.getName()+"..."+(ticket--));
    			}else break;
    		}
    	}
    }
    class TicketDemo2
    {
    	public static void main(String[] args) 
    	{
    		Ticket t1=new Ticket("一号窗口");
    		Ticket t2=new Ticket("二号窗口");
    		Ticket t3=new Ticket("三号窗口");
    		Ticket t4=new Ticket("四号窗口");
    		t1.start();
    		t2.start();
    		t3.start();
    		t4.start();
    	}
    }

**输出样例：**

> 一号窗口...100  
> 一号窗口...99  
> 一号窗口...98  
> 一号窗口...97  
> 一号窗口...96  
> 一号窗口...95  
> 一号窗口...94  
> 四号窗口...100  
> 二号窗口...100  
> 三号窗口...100  
> 二号窗口...99  
> 四号窗口...99
> 
> ...

### 情景二：四个窗口共售票100张。 ###

**方法一：**

class Ticket extends Thread 
    {
    	public static int ticket=100;
    	public void run(){
    		while(true){
    			if(ticket>0){
    				System.out.println(Thread.currentThread().getName()+"..."+(ticket--));
    			}else break;
    		}
    	}
    }
    class TicketDemo
    {
    	public static void main(String[] args) 
    	{
    		Ticket t1=new Ticket();
    		Ticket t2=new Ticket();
    		Ticket t3=new Ticket();
    		Ticket t4=new Ticket();
    		t1.start();
    		t2.start();
    		t3.start();
    		t4.start();
    	}
    }

** 方法二：**

class Ticket implements Runnable 
    {
    	public int ticket=100;
    	public void run(){
    		while(true){
    			if(ticket>0){
    				System.out.println(Thread.currentThread().getName()+"..."+(ticket--));
    			}else break;
    		}
    	}
    }
    class TicketDemo3
    {
    	public static void main(String[] args) 
    	{
    		Ticket t=new Ticket();
    		Thread t1=new Thread(t);
    		Thread t2=new Thread(t);
    		Thread t3=new Thread(t);
    		Thread t4=new Thread(t);
    		t1.start();
    		t2.start();
    		t3.start();
    		t4.start();
    	}
    }

**样例输出： **

> Thread-0...99  
> Thread-0...97  
> Thread-0...96  
> Thread-2...100  
> Thread-1...98  
> Thread-1...93  
> Thread-3...99  
> ...  
> **//可以看到0窗口和3窗口都售出了票号有99的票。  
> //产生这样的原因是：  
> //线程0后运行，线程3先运行。  
> //当线程0都打印出来后，线程3还没有打印出来。所以出现了两个99.**