JavaVersion

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interface Function {
	boolean run(int n);
}

class Crazy implements Function {
	public int run(int n) {
		if(Haelt.haelt(this, n)) return run(n);
		return n;
	}
}

class Test1 implements Runnable {
	public void run() {
		System.out.println("Hallo");
	}
}

class Test2 implements Runnable {
	public void run() {
		while(true) {}
	}
}

class Haelt {
	public static boolean haeltFuer(Function f, int n) {
		if(f.run(n)) return true;
		return false;
	}

	public static boolean haelt(Function f) {
		return haeltFuer(f, 0);
	}

	public static boolean haeltTricky(Runnable f, int timeout) throws InterruptedException {	
		Thread ft = new Thread(f);
		ft.start();
		
		while(timeout > 0) {
			if(ft.getState() == Thread.State.TERMINATED) {
				return true;
			}

			Thread.sleep(1000);
			timeout--;
		}

		ft.stop();
		return false;
	}

	public static void main(String[] args) {
		try {
		System.out.println(haeltTricky(new Test1(), 5));
		System.out.println(haeltTricky(new Test2(), 5));
		} catch(Exception ex) {
		}
	}
}

JavaVersion

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