Java多线程实践-优快云博客

本文链接：https://blog.youkuaiyun.com/Fish_Xx/article/details/104826239

本文深入探讨了Java中多线程的实现方式，包括通过实现Runnable接口和继承Thread类创建线程，以及如何使用同步机制解决线程间的资源竞争问题。通过具体的案例，如生产者消费者模型和哲学家就餐问题，展示了线程同步和协调的重要性。

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public class TestMyThread {

	public static void main(String[] args) {
		Thread t1 = new Thread(new MyThread1());
		Thread t2 = new MyThread2();
		t1.start();
		t2.start();
	}
}

class MyThread1 implements Runnable {

	@Override
	public void run() {
		for (int i = 0; i < 100; i++) {
			try {
				Thread.sleep((int)(Math.random() * 1000));
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			System.out.println("hello");
		}
	}
	
}
class MyThread2 extends Thread {

	@Override
	public void run () {
		for (int i = 0; i < 100; i++) {
			try {
				Thread.sleep((int)(Math.random() * 1000));
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			System.out.println("world");
		}
	}
	
}

案例

public class TestProductCustomer {
	public static void main(String[] args) {
		Shop shop = new Shop();
		
		Thread p = new Thread(new Product(shop),"生产者");
		Thread c = new Thread(new Customer(shop),"消费者1");
		Thread c1 = new Thread(new Customer(shop),"消费者2");
		p.start();
		c.start();
		c1.start();
		
	}
}
class Goods{
	private int id;
	public Goods(int id) {
		this.id = id;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	
}
class Shop{
	Goods goods;
	boolean flag;
	public synchronized void saveGoods(Goods goods) throws InterruptedException {
		if(flag) {
			System.out.println(Thread.currentThread().getName()+"：商品充足！要等待了！");
			this.wait();
		}
		System.out.println(Thread.currentThread().getName()+"生产并在商场里存放了"+goods.getId()+"件商品");
		this.goods = goods;
		flag = true;
	}
	public synchronized void buyGoods() throws InterruptedException {
		if(!flag) {
			System.out.println(Thread.currentThread().getName() +"：商品不充足！要等待了！");
			this.wait();
		}
		System.out.println(Thread.currentThread().getName()+"购买了"+ this.goods.getId()+"件商品");
		this.goods = null;
		flag =false;
		this.notifyAll();
	}
}
class Product implements Runnable{
	Shop shop;
	public Product(Shop shop) {
		this.shop = shop;
	}
	public void run() {
		for(int i = 1;i<=60;i++) {
			try {
				this.shop.saveGoods(new Goods(i));
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
}
class Customer implements Runnable{
	Shop shop;
	public Customer(Shop shop) {
		this.shop = shop;
	}
	public void run() {
		for(int i =1;i<=30;i++) {
			try {
				this.shop.buyGoods();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
}

package day3_12;


public class TestCode {

	public static void main(String[] args) {
		LeftChopstick left = new LeftChopstick();
		RightChopstick right = new RightChopstick();
		
		Thread boy = new Thread(new Boy(left,right));
		Thread girl = new Thread(new Girl(left,right));
		
		boy.start();
		girl.start();
	}

}
class LeftChopstick{
	String name = "左筷子";
}
class RightChopstick{
	String name = "右筷子";
}

class Boy implements Runnable{
	LeftChopstick left;
	RightChopstick right;
	public Boy(LeftChopstick left,RightChopstick right) {
		this.left =left;
		this.right = right;
	}
	public void run() {
		System.out.println("男孩要拿筷子！");
		synchronized(left) {
			try {
				left.wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			System.out.println("男孩拿到了左筷子，开始拿右筷子");
		}
		synchronized(right){
				System.out.println("男孩拿到了右筷子，开始吃饭");
		}
		
	}
}
class Girl implements Runnable{
	LeftChopstick left;
	RightChopstick right;
	public Girl(LeftChopstick left,RightChopstick right) {
		this.left =left;
		this.right = right;
	}
	public void run() {
		System.out.println("女孩要拿筷子！");
		synchronized(right) {
			System.out.println("女孩拿到了右筷子，开始拿左筷子");
		}
		synchronized(left){
			System.out.println("女孩拿到了左筷子，开始吃饭");
				
			left.notify();
		}
			
		
	}
}