生產者與消費者問題
package xianPack;
//生產者 消費者
public class Test10 {
public static void main(String[] args) {
final Apple apple = new Apple();
//吃蘋果的人 (上下兩種方法一樣)
new Thread(new Runnable() {
public void run() {
try {
apple.eat();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
},"線程1").start();
Thread thread1 = new Thread(new Runnable() {
public void run() {
try {
apple.eat();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
},"線程2");
thread1.start();
//種蘋果的
new Thread(new Runnable() {
public void run() {
try {
apple.plant();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
},"線程3").start();
new Thread(new Runnable() {
public void run() {
try {
apple.plant();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
},"線程4").start();
}
}
class Apple {
int num = 0; //蘋果的數量
//吃蘋果
void eat() throws InterruptedException {
while (true) {
synchronized (this) {
if (num > 0) {
num--;
Thread thread = Thread.currentThread();
System.out.println(thread.getName() + "吃蘋果,剩下" + num);
//并且通知種蘋果的種
notifyAll();
}else { //沒有蘋果了
//進入等待狀態
wait();
//并且通知種蘋果的種
//notify(); //通知一個
}
}
}
}
//種蘋果
void plant() throws InterruptedException {
while (true) {
//鎖放在里邊 一邊吃一邊種
synchronized (this) {
//如果生產大于20個,停止生產
if (num < 20) {
this.num++;
Thread thread = Thread.currentThread();
System.err.println(thread.getName() + "種蘋果,剩下" + num);
//通知吃蘋果的吃
notifyAll(); //通知所有的
}else { //蘋果太多 不能生產了
//等待
wait();
}
}
}
}
}
