deadlock.java

清华大学辛运帏java程序设计第二版源代码

class classA {
	public classB b;
	synchronized void methoda() {
		String name = Thread.currentThread().getName();
		System.out.println( name +" entered classA.methoda." );
	try {
		Thread.sleep( 1000 );
	} catch ( InterruptedException e ){}
	System.out.println( name +" trying to call classB.methodb()" );
	b.methodb();
	}
	synchronized void methodb() {
		System.out.println( " inside classA.mothedb()");
	}
}
class classB {
	public classA a;
	synchronized void methoda() {
		String name = Thread.currentThread().getName();
		System.out.println( name +" entered classB.methoda." );
	try {
		Thread.sleep( 1000 );
	} catch ( InterruptedException e ){}
	System.out.println( name +" trying to call classA.methodb()" );
	a.methodb();
	}
	synchronized void methodb() {
	System.out.println( " inside classB.mothedb() " );
	}
}
class DeadLock implements Runnable{
	classA a = new classA();
	classB b = new classB();
	DeadLock(){
		Thread.currentThread().setName( "MainThread" );
		a.b = b;
		b.a = a;
		new Thread( this ).start();
		a.methoda();
		System.out.println( "back to main thread" );
	}
	public void run(){
		Thread.currentThread().setName( "RacingThread" );
		b.methoda();
		System.out.println( "back to racing thread" );
	}
	public static void main( String args[] ){
		new DeadLock();
	}
}