deadlockdemo.java

nanjing university cs 的java课件。 对新手很有用。付课件中源码。

public class DeadLockDemo {
	public static void main(String args[]) {	//Create objects
			A a = new A();
			B b = new B();
			a.b = b;
			b.a = a;
			Thread1 t1 = new Thread1(a); //Create threads
			Thread2 t2 = new Thread2(b);
			t1.start(); 
			t2.start();
			try {t1.join(); t2.join();} //wait for threads to complete
			catch (Exception e) { e.printStackTrace(); }
			System.out.println("Done!");
     }
}

class A {
	B b;
	synchronized void a1() {
		       	System.out.println("Starting a1");
		b.b2();
	}

	synchronized void a2() {
		   
     	System.out.println("Starting a2");
	}
}
class B {
	A a;
	synchronized void b1() {
			System.out.println("Starting b1");
		a.a2();
	}

	synchronized void b2() {
			System.out.println("Starting b2");
	}
}

class Thread1 extends Thread {
	A a;
	Thread1(A a) {
			this.a = a;
	}

	public void run() {
			for (int i = 0; i < 100000; i++)
				a.a1();
	}
}

class Thread2 extends Thread {
	B b;
	Thread2(B b) {
			this.b = b;
	}

	public void run() {
			for (int i = 0; i < 100000; i++)
				b.b1();
	}
}