下面是一個典型的生產者消費者模式寫法,註釋比較清晰,便於大家學習。
import HomeWork01.Container.Producer;
/**
* 容器類,構建生產者和消費者兩個內部類,和put(),take()兩個方法;
*@project Java_pro
*/
class Container {
/**
* size:容器容量;
* array:構造的容器;
* sth:放入容易的元素,每放入一次執行sth--;
*/
private int size;
private Object[] array;
private volatile Integer sth = 100;
/*構造方法傳遞容量參數*/
public Container(int cap) {
this.array = new Object[cap];
}
/**
* tName:當前線程名稱
* @param obj:放入容器的對象
* 判斷容器容量是否已滿,如果滿了打印語句,執行wait()方法,阻塞調用此方法的線程,釋放鎖;
* 否則在size位置放入obj,打印線程tName放入obj,並擴容;
* 完成放入後廣播通知其他正在處於wait()的線程,允許取數據;
*/
public synchronized void put(Object obj) {
String tName = Thread.currentThread().getName();
while (size == array.length) {
System.out.println("容器已經滿了。");
try {
wait();
} catch (InterruptedException e) {
}
}
array[size] = obj;
System.out.println("Thread " + tName + " put: " + obj);
size++;
notifyAll();
}
/**
* tName:當前線程名稱
* 判斷容器容量是否已空,如果空了打印語句,執行wait()方法,阻塞調用此方法的線程,釋放鎖;
* 否則取出首位元素,打印tName取出obj;
* 取出後將1號至隊尾所有元素賦值到0號位至隊尾-1位,一共size-1個元素,size--;
* 完成取出後廣播通知其他正在處於wait()的線程,允許放數據;
*/
public synchronized void take() {
String tName = Thread.currentThread().getName();
while (size == 0) {
System.out.println("容器已經空了。");
try {
wait();
} catch (InterruptedException e) {
}
}
Object temp = array[0];
System.out.println("Thread " + tName + " take:" + temp);
System.arraycopy(array, 1, array, 0, size - 1);
size--;
array[size] = null;
notifyAll();
}
/*生產者線程調用put()方法放入數據sth*/
class Producer extends Thread {
Container container;
public Producer(Container container) {
this.container = container;
}
@Override
public void run() {
while (true) {
container.put(sth);
--sth;
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
}
}
}
/*消費者線程調用take()方法取出數據sth*/
class Consumer extends Thread {
Container container;
Object temp;
public Consumer(Container container) {
this.container = container;
}
@Override
public void run() {
while (true) {
container.take();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
}
}
}
}
public class Producer_ConsumerDemo {
public static void main(String[] args) throws InterruptedException {
Container c = new Container(5);
Producer pro1 = c.new Producer(c);
pro1.start();
c.new Consumer(c).start();
}
}