解决线程安全问题二

package deep;
//同步方法解决Ruanable接口
class Window3 implements Runnable {
    private int ticket = 100;

    public void run() {
        while (true) {
            show();
        }
    }

    private synchronized void show() {

        if (ticket > 0) {

            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName() + ":卖票：票号为:" + ticket);
            ticket--;
        }

    }
}

public class WindowTest3 {
    public static void main(String[] args) {
        Window3 w = new Window3(); //创建一个对象

        Thread t1 = new Thread(w); //三个构造器使用同一个对象
        Thread t2 = new Thread(w);
        Thread t3 = new Thread(w);

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

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

package deep;
//使用同步方法来解决Thread类
class Window4 extends Thread {
    private static int ticket = 100 ; //三个线程共享静态变量,避免卖出300张票
    public void run(){
        while (true) {
        show();
    }
}
private static synchronized void show(){ //此时同步监视器需要更改
    if (ticket > 0) {
        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("窗口一");
        t2.setName("窗口二");
        t3.setName("窗口三");

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