import java.util.*;class Widget...{}
class WidgetMaker extends Thread...{
ArrayList finishedWidgets=new ArrayList();
public void run(){
try{
while(true){
Thread.sleep(5000);//act busy
synchronized(this){
finishedWidgets.add(w);
notify();
}
}
}
catch(InterruptedException e){}
}
public Widget waitForWidget(){
synchronized(this){
if(finishedWidgets.size()==0){
try{
wait();
}
catch(InterruptedException e)
{}
}
return (Widget)finishedWidgets.get(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.waitForWidget();
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(); }}
这是网上找的一个例子,他本来是用sychronized(finishedWidgets)的,但我改成this后,发现使用notify()与notifyAll()效果一样,都是把全部的wait线程唤醒。
不知有没有高人知道是怎么回事。
class WidgetMaker extends Thread...{
ArrayList finishedWidgets=new ArrayList();
public void run(){
try{
while(true){
Thread.sleep(5000);//act busy
synchronized(this){
finishedWidgets.add(w);
notify();
}
}
}
catch(InterruptedException e){}
}
public Widget waitForWidget(){
synchronized(this){
if(finishedWidgets.size()==0){
try{
wait();
}
catch(InterruptedException e)
{}
}
return (Widget)finishedWidgets.get(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.waitForWidget();
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(); }}
这是网上找的一个例子,他本来是用sychronized(finishedWidgets)的,但我改成this后,发现使用notify()与notifyAll()效果一样,都是把全部的wait线程唤醒。
不知有没有高人知道是怎么回事。
new WidgetUser("Moe",maker).start();
new WidgetUser("Curly",maker).start();
创建了三个对象,它们中的this各不相同.