解决多线程的安全问题方式二

/**
* 解决多线程中线程安全的方式二：同步方法，操作共享数据的是一个方法
*   1.同步方法仍然涉及到同步监视器，只是不需要显示的声明
*   2.非静态的同步方法，同步监视器是this
*     静态的同步方法，同步监视器是类本身(类.class)
*
*
*
*/
public class ThreadMethodDemo {
    public static void main(String[] args) {
        RunnableImp1 runnableImp1 = new RunnableImp1();

        Thread thread1 = new Thread(runnableImp1);
        Thread thread2 = new Thread(runnableImp1);
        Thread thread3 = new Thread(runnableImp1);

        thread1.setName("Runnable窗口1");
        thread2.setName("Runnable窗口2");
        thread3.setName("Runnable窗口3");

        thread1.start();
        thread2.start();
        thread3.start();

        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        ThreadExtends threadExtends1 = new ThreadExtends();
        ThreadExtends threadExtends2 = new ThreadExtends();
        ThreadExtends threadExtends3 = new ThreadExtends();

        threadExtends1.setName("Thread窗口1");
        threadExtends2.setName("Thread窗口2");
        threadExtends3.setName("Thread窗口3");

        threadExtends1.start();
        threadExtends2.start();
        threadExtends3.start();
    }
}


/*实现Runnable方式*/
class RunnableImp1 implements Runnable{

    private int ticket = 100;
    @Override
    public void run() {
        while(true){
            if(ticket > 0){
                show();
            }else{
                break;
            }
        }
    }

    public synchronized void show(){//此处的synchronized相当于this
        if(ticket > 0){
            System.out.println(Thread.currentThread().getName() + "卖票，票号为：" + ticket);
            ticket--;
        }
    }
}

class ThreadExtends1 extends Thread{
    private static int ticket = 100;
    @Override
    public void run() {
        while(true){
            if(ticket > 0){
                show();
            }else{
                break;
            }
        }
    }
    public static synchronized void show(){//此处的synchronized相当于当前类对象（ThreadExtends1.class）
        if(ticket > 0){
            System.out.println(Thread.currentThread().getName() + "卖票，票号为：" + ticket);
            ticket--;
        }
    }
}