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最新推荐文章于 2024-12-19 10:11:44 发布

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最新推荐文章于 2024-12-19 10:11:44 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/spectrumleeee/article/details/16847959

本文介绍了一个使用Java实现的同步方法案例，通过两个线程分别调用同一对象的两个同步方法来展示同步机制如何防止并发修改错误。每个方法执行时会打印开始和结束信息，并让线程暂停1秒。

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class CommonHelloWorld22222222222222 { 
	public synchronized void synchronizedMethod1() { 
		System.out.println ("synchronizedMethod1 called"); 
	try { 
		Thread.sleep (1000); 
		} catch (InterruptedException e) { 
			e.printStackTrace (); 
		} 
		System.out.println ("synchronizedMethod1 done"); 
	} 

	public synchronized void synchronizedMethod2() { 
		System.out.println ("synchronizedMethod2 called"); 
		try { 
			Thread.sleep (1000); 
		} catch (InterruptedException e) { 
			e.printStackTrace (); 
		} 
			System.out.println ("synchronizedMethod2 done"); 
		} 
} 

public class SynchronizedMethod12 extends Thread { 
	private int id = 0; 
	private Common common; 

	public SynchronizedMethod12 (String name, int no, Common object) { 
		super(name); 
		common = object; 
		id = no; 
	} 

	public void run () { 
		System.out.println ("Running Thread" + this.getName ()); 
		try { 
		if (id == 0) { 
			common.synchronizedMethod1(); 
		} else { 
			common.synchronizedMethod2(); 
		} 
			} catch (Exception e) { 
				e.printStackTrace (); 
			} 
	} 

	public static void main (String[] args) { 
		Common c = new Common (); 
		SynchronizedMethod12 t1 = new SynchronizedMethod12 ("SynchronizedMethod12-1", 0, c); 
		SynchronizedMethod12 t2 = new SynchronizedMethod12 ("SynchronizedMethod12-2", 1, c); 
		t1.start (); 
		t2.start (); 
	} 
}