清华大学：JAVA教学课件：11-6

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();
}
}