초초의 다락방

import java.util.*;
class VideoShop{
	private Vector buffer = new Vector();
	public VideoShop(){
		buffer.addElement("Test01");
		buffer.addElement("Test02");
		buffer.addElement("Test03");
		buffer.addElement("Test04");
		buffer.addElement("Test05");
	}
	public synchronized String lendVideo(){
		if(buffer.size() > 0){
			String v= (String)this.buffer.remove(buffer.size() - 1);
			return v;
		} else {
			return null;
		}
	}
	public synchronized void returnVideo(String video){
		this.buffer.addElement(video);
	}
}
class Person extends Thread{
	public void run(){
//		synchronized (VideoShopMain.vshop) {
			// 5초 동안 VideoShopMain.vshop은 Lock에 걸리게 됨
		String v = VideoShopMain.vshop.lendVideo();
		if(v == null){
			System.out.println(this.getName() + " 비디오가 없음");
			return;
		}
		try{
			System.out.println(this.getName() + " : " + v + "대여");
			//System.out.println(this.getName() + " : " + v + "보는중");
			this.sleep(5000);
			//System.out.println(this.getName() + " : " + v + "반납");
			VideoShopMain.vshop.returnVideo(v);
		}catch (InterruptedException e) {
			// TODO: handle exception
			e.printStackTrace();
		}
			
//		}
	}
}
public class VideoShopMain {
	public static VideoShop vshop = new VideoShop();
	public static void main(String[] args){
		System.out.println("프로그램 시작");
		Person p1 = new Person();
		Person p2 = new Person();
		Person p3 = new Person();
		Person p4 = new Person();
		Person p5 = new Person();
		Person p6 = new Person();
		Person p7 = new Person();
		p1.start();
		p2.start();
		p3.start();
		p4.start();
		p5.start();
		p6.start();
		p7.start();
		//System.out.println("프로그램 종료");
	}
}