deadlockdemo.java

java入门经典教程 java入门经典教程 java入门经典教程

// 例4.5.4 DeadLockDemo.java
class ShareString   // 封装了两个共享资源
{
	public static String str1="A";
	public static String str2="B";
}
class SynchDeadLock1 extends Thread
{	
	SynchDeadLock1(String name)
{
		super(name);
	}	
	public void run()
{
		synchronized(ShareString.str1)
{
			System.out.println(getName()+" have resource A");
			System.out.println(getName()+" is waitiing resource B...");
			try
{
				Thread.sleep(1000);
			}catch(InterruptedException e){ }

			synchronized(ShareString.str2)
{
				System.out.println(getName()+" have resource B");
				System.out.println("Result is "+ShareString.str1
+ShareString.str2);
			}
		}
	}
}
class SynchDeadLock2 extends Thread
{	
	SynchDeadLock2(String name)
{
		super(name);
	}	
	public void run()
{
		synchronized(ShareString.str2)
{
			System.out.println(getName()+" have resource B");
			System.out.println(getName()+" is waitiing resource A...");
			try
{
				Thread.sleep(500);
			}catch(InterruptedException e){ }

			synchronized(ShareString.str1)
{
				System.out.println(getName()+" have resource A");
				System.out.println("Result is "+ShareString.str2
+ShareString.str1);
			}
		}
	}
}
class DeadLockDemo
{
	public static void main(String[] args)   // 创建两个独立的线程
	{
		SynchDeadLock1 s1 = new SynchDeadLock1("Mission 1");
		SynchDeadLock2 s2 = new SynchDeadLock2("Mission 2");
		s1.start();
		s2.start();
	}
}