多线程2

最新推荐文章于 2023-10-14 20:02:37 发布

原创最新推荐文章于 2023-10-14 20:02:37 发布 · 195 阅读

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博客主要介绍Java中的线程同步处理。Java通过synchronized关键字实现同步，关键是为代码加锁，操作方法有同步方法和同步代码块。还阐述了生产者与消费者模式，生产者生产的商品由消费者消费，二者交替进行，并给出测试类及运行效果。

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线程同步处理

java中提供synchronized关键字实现同步处理，同步的关键是要为代码加上锁，而对于所锁的操作方法有两种：同步方法和同步代码块
测试类

public class Test {
	public static void main(String[] args) {
		MyThread m = new MyThread();
		new Thread(m,"售票员A").start();
		new Thread(m,"售票员B").start();
		new Thread(m,"售票员C").start();
	}

}

使用同步方法

public class MyThread implements Runnable {
	private int ticket = 10;
	@Override
	public void run() {
		// TODO Auto-generated method stub
		while (true) {
			if(ticket>0) {
				ticket--;
				try {
					Thread.sleep(100);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				System.out.println(Thread.currentThread().getName()+"卖了第"+(10-this.ticket)+"票");
			}
			else {
				System.out.println("票卖光了");
				break;
			}
			
			
		}
		
	}

使用同步代码块

public class MyThread implements Runnable {
	private int ticket = 100;


	@Override
	public void run() {
		// TODO Auto-generated method stub

		while (true) {

			synchronized (this) {
				if (ticket > 0) {
					ticket--;
					try {
						Thread.sleep(100);

					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					System.out.println(Thread.currentThread().getName() + "卖了第" + (100 - this.ticket) + "票");

				} else {
					System.out.println("票卖光了");
					break;
				}

			}

		}

	}

}

生产者与消费者

生产者生产什么消费者就消费什么。并且生产者与消费者交替进行
商品

public class Product {
	//品牌
	private String name;
	//名字
	private String brand;
	private Boolean flag = true;
	public  String getBrand() {
		return brand;
	}
	public  void setBrand(String brand) {
		this.brand = brand;
	}
	public  String getName() {
		return name;
	}
	public  void setName(String name) {
		this.name = name;
	}
	public synchronized void setProduct(String brand,String name) {
		if(flag==false) {
			try {
				super.wait();
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		this.setBrand(brand);
		try {
			Thread.sleep(100);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		this.setName(name);
	
		System.out.println(Thread.currentThread().getName() + ":" + "生产了" + this.getBrand().concat(this.getName()));
		
		super.notify();
		flag=false;
	}
	public synchronized void getProduct() {
		if(flag==true)
		try {
			super.wait();
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		System.out.println(Thread.currentThread().getName() + ":" + "买了" + getBrand() + "" + getName());
		
		super.notify();
		flag=true;
	}
	
	

}

消费者

public class Consumer implements Runnable {
	private Product p;
	public Consumer(Product p) {
		this.p = p;
	}
	public void run() {
		for (int i = 0; i < 10; i++) {
			p.getProduct();
		}
	}
}

生产者

public class Producter implements Runnable {
	private Product p;
	public Producter(Product p) {
		this.p = p;
	}

	public void run() {
		for (int i = 0; i < 10; i++) {
			if (i % 2 == 0) {
				p.setProduct("蒙牛", "核桃奶");
			} else {
				p.setProduct("康师傅", "方面面");
			}

		}
	}

}

测试类

public class Test {
	public static void main(String[] args) {
		Product product = new Product();
		Producter producter = new Producter(product);
		Consumer consumer = new Consumer(product);
		Thread t1 = new Thread(producter,"生产者");
		Thread t2 = new Thread(consumer,"消费者");
		t1.start();
		t2.start();
	}

运行效果
在这里插入图片描述