Java 学习————多线程同步

public class Tongywo {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Shangdian0 sd=new Shangdian0(100);
		Goumai0 no1=new Goumai0(70, sd, "No.1");
		Goumai0 no2=new Goumai0(80, sd, "No.2");

		no1.start();
		no2.start();
	}

}

class Shangdian0{

	int kucun=0;

	public Shangdian0(int kucun){

		this.kucun=kucun;
	}

	public synchronized void goumai(int i){

		if(i<kucun){

			kucun-=i;
			System.out.println(Thread.currentThread().getName()+"购买"+i+"本");
			System.out.println("商店剩余"+kucun+"本");
		}
		else{

			System.out.println("库存量不够");
		}
	}
}

class Goumai0 extends Thread{

	int i;
	Shangdian0 sd;

	public Goumai0(int i, Shangdian0 sd, String name){

		this.i=i;
		this.sd=sd;
		this.setName(name);
	}

	public void run(){

		sd.goumai(i);
	}
}