java多線層同時啟動並執行解決，同步代碼塊synchronized

標籤：

/*多個線層同時操作一個資料會導制資料超出同步代碼塊synchronized(對像){需要同步的代碼}*/class Do7 {    public static void main(String[] args)     {            Piao p1=new Piao();            Thread t1=new Thread(p1);            Thread t2=new Thread(p1);            Thread t3=new Thread(p1);            Thread t4=new Thread(p1);            t1.start();t2.start();t3.start();t4.start();    }}class Piao implements Runnable{    private  static int num=100;    Object obj=new Object();//隨便建立一個對象，用於synchronized(對像)    public void run()    {        while(true)        {synchronized(obj)///同步代碼塊    {        if (num>0)        {            try{Thread.sleep(10);}catch(Exception e){}            System.out.println(Thread.currentThread().getName()+"....."+num--);        }        else{        return;}}        }    }}

 

java多線層同時啟動並執行解決，同步代碼塊synchronized