Java------多线程_并发_同步_快乐火车例子以及ArrayList的并发容器（十）

Java------多线程_并发_同步_快乐火车例子以及ArrayList的并发容器（十）
将之前电影院购票的例子，修改为synchronized方法块的形式。
但是有两个疑问
1.为什么这里面的两个类，不用@Override run（）方法？
2.为什么是Customer2 .start而执行的是Cinema2 的方法？

/**
 * 火车购票例子
 */
public class ThreadSyn052 {
    
    
    public static void main(String[] args) {
    
    
        Cinema2 cinema = new Cinema2(100,"火车");
         new Customer2(cinema,"小白",80).start();
         new Customer2(cinema,"小黑",80).start();
    }

}

//火车票网
class Cinema2 implements Runnable{
    
    
    public int avaliabe;  //可用位置
    public String name;   //名称

    public Cinema2(int avaliabe, String name) {
    
    
        this.avaliabe = avaliabe;
        this.name = name;
    }
    //购票
    public synchronized boolean bookTickets(int seats){
    
    
        System.out.println("可用位置为："+avaliabe);
        if (seats > avaliabe){
    
    
            return false;
        }else {
    
    
            avaliabe -= seats;
            return true;
        }
    }

    public void run() {
    
    
        Customer2 customer = (Customer2) Thread.currentThread();
        boolean flag;
        flag = this.bookTickets(customer.seats);
        if (flag){
    
    
            System.out.println("出票成功："+Thread.currentThread().getName()+"---位置为："+customer.seats);
        }else {
    
    
                System.out.println("出票失败"+ Thread.currentThread().getName()+"---位置不够");
        }
    }
}

//顾客
class Customer2 extends Thread{
    
    
    int seats;//位置
    
    public Customer2(Runnable target , String name,int seats){
    
    
        super(target,name);
        this.seats = seats;
    }
}

希望有理解的朋友能解答一下。
之前的ArraryList的多线程添加时，会重复添加，导致添加100次，list长度不到100。而ArrayList有对应的并发容器，能够在不用添加synchronized的情况下，做到线程同步。`

import java.util.concurrent.CopyOnWriteArrayList;

/**
 * ArrayList的并发容器
 */
public class ThreadSyn03 {
    
    
    public static void main(String[] args) throws InterruptedException {
    
    
        CopyOnWriteArrayList<String> arrayList = new CopyOnWriteArrayList<String>();
        for (int i = 0 ; i<100;i++){
    
    
            new Thread(()->{
               arrayList.add(Thread.currentThread().getName());
            }).start();
        }
        Thread.sleep(5000);
        System.out.println(arrayList.size());
    }
}