Java instanceof关键字

public class Computer {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Computer computer = new Computer();
		Pad pad = new Pad();
		LenovoPad lenovoPad = new LenovoPad();
		
		System.out.println("？ "+(computer instanceof Computer));//true
		System.out.println("？ "+(pad instanceof Computer));//true
		System.out.println("？ "+(lenovoPad instanceof Pad));//true
		System.out.println("？ "+(lenovoPad instanceof Computer));//true
		System.out.println("？ "+(pad instanceof LenovoPad));//false
	}
}
class Pad extends Computer{	

}

class LenovoPad extends Pad{
	
}