Java Synchronized 略解

最新推荐文章于 2023-09-27 02:00:00 发布

pi408637535

最新推荐文章于 2023-09-27 02:00:00 发布

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分类专栏： Java 基础文章标签： Java Synchronized 略解

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本文深入探讨了并发编程中的同步条件及其代码实现，包括使用同意堆栈和对象同步锁来确保线程间的正确交互。通过示例代码展示了如何在多线程环境下实现同步操作，以避免数据竞争和死锁问题。

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同步条件 ①两个或两个以上线程对象用同意堆栈 ② synchronize 锁同一对象

synchrozed （默认）锁的对象是 this

代码验证：同步条件


class Ticket implements Runnable{

	boolean flag = true;
	private int tick = 1000;
	Object object = new Object();
	public void run() {
		// TODO Auto-generated method stub
		if(flag){
			while(true){
				synchronized (object) {   //synchronized 锁object对象
					if(tick > 0){
						try {
							Thread.sleep(10);
						} catch (InterruptedException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
						System.out.println(Thread.currentThread().getName() + "...show..." + tick--);
					}
				}
			}
		}
		
		else{
			while(true){
				show();
			}
		}
	}
	
	public synchronized void  show() {
		if(tick > 0){
			try {
				Thread.sleep(10);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			System.out.println(Thread.currentThread().getName() + "...sale..." + tick--);
		}
	}
}

public class Hello {

	public static void main(String[] args) {
		Ticket t = new Ticket();
		Thread t1 = new Thread(t);
		Thread t2 = new Thread(t);
		t1.start();
		try {
			Thread.sleep(10);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		t.flag =  false;
		t2.start();
	}
}

打印结果会出现：Thread-0...show...0


class Ticket implements Runnable{

	boolean flag = true;
	private int tick = 1000;
	Object object = new Object();
	public void run() {
		// TODO Auto-generated method stub
		if(flag){
			while(true){
				synchronized (this) {
					if(tick > 0){
						try {
							Thread.sleep(10);
						} catch (InterruptedException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
						System.out.println(Thread.currentThread().getName() + "...show..." + tick--);
					}
				}
			}
		}
		
		else{
			while(true){
				show();
			}
		}
	}
	
	public synchronized void  show() {
		if(tick > 0){
			try {
				Thread.sleep(10);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			System.out.println(Thread.currentThread().getName() + "...sale..." + tick--);
		}
	}
}

public class Hello {

	public static void main(String[] args) {
		Ticket t = new Ticket();
		Thread t1 = new Thread(t);
		Thread t2 = new Thread(t);
		t1.start();
		try {
			Thread.sleep(10);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		t.flag =  false;
		t2.start();
	}
}

打印结果：Thread-0...show...1 到此为止