生產者與消費者問題Java實現
產品類：
public class Product {
private int id;
private String value;
public Product(int id,String value){
this.id=id;
this.value=value;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
公用緩衝池
import java.util.LinkedList;
public class ProductTable {
// 緩衝池
private LinkedList<Product> products = new LinkedList<Product>();
// 生產
public synchronized void produce(Product product) {
while(products.size() >= 10) { // 容量限制為 10
try {
wait();
}
catch(InterruptedException e) {}
}
products.addLast(product);
System.out.println(product.getId()+" added");
notifyAll();
}
// 消費
public synchronized Product consume() {
while(products.size() <= 0) {
try {
wait();
}
catch(InterruptedException e) {}
}
Product product = (Product) products.removeFirst();
System.out.println(product.getId()+" removed");
notifyAll();
return product;
}
}
生產者：
public class Producer implements Runnable {
private ProductTable productTable;
public Producer(ProductTable productTable) {
this.productTable = productTable;
}
public void run() {
for (int i=0; i<5; i++) {
Product p = new Product(i, "product " + "-" + i);
productTable.produce(p);
try {
Thread.sleep((int) (Math.random() * 3000)); // 等待一個隨機的時間
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
消費者：
public class Consumer implements Runnable {
private ProductTable productTable;
public Consumer(ProductTable productTable) {
this.productTable = productTable;
}
public void run() {
for (int i = 1; i <= 5; i++) {
try {
Thread.sleep((int) (Math.random() * 3000)); // 等待一個隨機的時間
}
catch (InterruptedException e) {
e.printStackTrace();
}
productTable.consume();
}
}
}
測試類：
public class Test {
public static void main(String[] args) {
ProductTable queue = new ProductTable();
// 生產者線程體
Producer producer = new Producer(queue);
// 消費者線程體
Consumer consumer = new Consumer(queue);
for (int i=0; i<2; i++) {
Thread prod = new Thread(producer);
prod.start();
}
for (int i=0; i<2;i++) {
Thread consu = new Thread(consumer);
consu.start();
}
}
}
