notify() 和notifyAll()区别

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引用网上的例子，在明知到生产者 一个生产者，几个抢食者，如果通知所有的抢食者执行的操作会发生异常的时候，使用notify

import java.util.ArrayList;import java.util.List;class Widget{}class WidgetMaker extends Thread{    List finishedWidgets = new ArrayList();    public void run(){         try{             while(true){                 Thread.sleep(5000);                 Widget w = new Widget();                 Widget i = new Widget();                 Widget d = new Widget();                 synchronized (finishedWidgets) {                    finishedWidgets.add(w);                    finishedWidgets.add(i);                    finishedWidgets.add(d);                    finishedWidgets.notifyAll();                }             }         }catch(InterruptedException e)         {}         }        public Widget waitForWiget() {        synchronized (finishedWidgets) {            if (finishedWidgets.size() == 0) {                try {                    finishedWidgets.wait();                } catch (InterruptedException e) {                }            }            return (Widget) finishedWidgets.remove(0);        }    }}public class WidgetUser extends Thread{    private WidgetMaker maker;    public WidgetUser(String name,WidgetMaker maker){        super(name);        this.maker = maker;    }        public void run(){        Widget w = maker.waitForWiget();        System.out.println(getName()+"got a widget");    }        public static void main(String[] args){        WidgetMaker maker = new WidgetMaker();        maker.start();        new WidgetUser("Lenny", maker).start();        new WidgetUser("Moe", maker).start();        new WidgetUser("Curly", maker).start();    }}