并发问题2

package socket;

public class SyncDemo {

	public static void main(String[] args) {
		Table table = new Table();
		Thread t1 = new Thread(){
			public void run(){
				while(true){
					int bean = table.getBean();
					System.out.println(getName()+":"+bean);
				}
			}
		};
		Thread t2 = new Thread(){
			public void run(){
				while(true){
					int bean = table.getBean();
					System.out.println(getName()+":"+bean);
				}
			}
		};
		t1.start();
		t2.start();

	}

}
class Table{
	//20个豆子
	private int beans = 20;
	
	public int getBean(){
		if(beans ==0){
			throw new RuntimeException("没有豆子");
		}
		//模拟线程执行到这里没有时间了
		Thread.yield();
		return beans--;
	}
}