java多线程锁的实现

1.使用同步代码块实现

1.1在继承Thread的方式下实现

public class windows extends Thread {

    private static int ticket = 100;

    @Override
    public void run() {
        while (true) {
            synchronized (windows.class) {
                if (ticket > 0) {
                    System.out.println(getName() + "票号为" + ticket);
                    ticket--;
                } else {
                    break;
                }
            }

        }


    }

    public static void main(String[] args) {
        windows windows = new windows();
        windows windows1 = new windows();
        windows windows3 = new windows();
        windows.start();
        windows1.start();
        windows3.start();
    }
}

1.2在实现Runnable的方式先实现

public class windows2 implements Runnable {
    private int ticket = 100;

    @Override
    public void run() {
        while (true) {
            synchronized (this) {
                if (ticket > 0) {
                    System.out.println(Thread.currentThread().getName() + "票号为" + ticket);
                    ticket--;
                } else {
                    break;
                }
            }

        }
    }

    public static void main(String[] args) {
        windows2 windows = new windows2();
        Thread thread = new Thread(windows);
        Thread thread2 = new Thread(windows);
        Thread thread3 = new Thread(windows);
        thread.start();
        thread2.start();
        thread3.start();

    }
}

2.使用同步方法实现

2.1在继承方式实现

public class windows extends Thread {

    private static int ticket = 100;

    @Override
    public void run() {
        while (true) {
            show();
            if(ticket==0){
                break;
            }
        }


    }
    //为什么这里是静态的,因为要多个对象共用这一个方法这样才能同步
    public static synchronized void show(){
        if (ticket > 0) {
            System.out.println(Thread.currentThread().getName() + "票号为" + ticket);
            ticket--;
        }
    }


    public static void main(String[] args) {
        windows windows = new windows();
        windows windows1 = new windows();
        windows windows3 = new windows();
        windows.start();
        windows1.start();
        windows3.start();
    }
}

在实现接口方法实现

public class windows2 implements Runnable {

private int ticket = 100;

@Override
public void run() {
    while (true) {
            show();
             if(ticket==0) {
                break;
            }

    }
}
public synchronized void show(){
    if (ticket > 0) {
        System.out.println(Thread.currentThread().getName() + "票号为" + ticket);
        ticket--;
    }
}

public static void main(String[] args) {
    windows2 windows = new windows2();
    Thread thread = new Thread(windows);
    Thread thread2 = new Thread(windows);
    Thread thread3 = new Thread(windows);
    thread.start();
    thread2.start();
    thread3.start();

}

}

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