1，繼承 Thread（各自賣10張票）

class MyThread extends Thread{
    private int ticket = 10;
    public void run() {
        for(int i = 0; i < 10; i++) {
            if(this.ticket > 0) {
                System.out.println("正在賣第" + (this.ticket--) + "張票");
            }
        }
    }
}

public class Test1 {
    
 
public static void main(String[] args) {
        MyThread mt1 = new MyThread();
        MyThread mt2 = new MyThread();
        MyThread mt3 = new MyThread();
        mt1.start();
        mt2.start();
        mt3.start();
    }
}

2，實現 Runnable（一起賣10張票）

class MyThread implements Runnable{
    private
 
 int ticket = 10;
    public void run() {
        for(int i = 0; i < 10; i++) {
            if(this.ticket > 0) {
                System.out.println("正在賣第" + (this.ticket--) + "張票");
            }
        }
    }
}

public class Test1 {
    public static void main(String[] args) {
        MyThread mt 
 
= new MyThread();
        // 3 個線程同時占用著 mt
        new Thread(mt).start();
        new Thread(mt).start();
        new Thread(mt).start();
    }
}

區別：

1，Runnable 解決了單繼承問題

2，Runnable 更好描述共享資源

Java 兩種實現多線程的區別