Java synchronization method of handling security thread Thread class inheritance

/ ** 
* using a synchronization method of treating inherited security thread in the embodiment of the Thread class 
* 
* / 
class Window4 the extends Thread { 


    Private static int Ticket = 100; 

    @Override 
    public void RUN () { 

        the while (to true) { 

            Show (); 
        } 

    } 
    Private the synchronized static void Show () {// synchronization monitor: Window4.class 
        // the synchronized Private void Show () {// synchronization monitor: t1, t2, t3. Such a solution is wrong 
        IF (Ticket> 0) { 

            the try { 
                the Thread.sleep (100); 
            } the catch (InterruptedException E) { 
                e.printStackTrace (); 
            }

            System.out.println(Thread.currentThread().getName() + "：卖票，票号为：" + ticket);
            ticket--;
        }
    }
}


public class WindowTest4 {
    public static void main(String[] args) {
        Window4 t1 = new Window4();
        Window4 t2 = new Window4();
        Window4 t3 = new Window4();


        t1.setName("窗口1");
        t2.setName("窗口2");
        t3.setName("窗口3");

        t1.start();
        t2.start();
        t3.start();

    }
}