【java0009】多线程同步代码块和同步函数

同步函数的锁是固定的this。

class Ticket implements Runnable
{
private  int num = 100;
//  Object obj = new Object();
boolean flag = true;
public void run()
{
//      System.out.println("this:"+this);

if(flag)
while(true)
{
synchronized(this)
{
if(num>0)
{
try{Thread.sleep(10);}catch (InterruptedException e){}
System.out.println(Thread.currentThread().getName()+".....obj...."+num--);
}
}
}
else
while(true)
this.show();
}

public synchronized void show()
{
if(num>0)
{
try{Thread.sleep(10);}catch (InterruptedException e){}

System.out.println(Thread.currentThread().getName()+".....function...."+num--);
}
}
}

class SynFunctionLockDemo
{
public static void main(String[] args)
{
Ticket t = new Ticket();
//      System.out.println("t:"+t);

Thread t1 = new Thread(t);
Thread t2 = new Thread(t);

t1.start();
try{Thread.sleep(10);}catch(InterruptedException e){}
t.flag = false;
t2.start();
}
}