Using instanceof in java What is the result Yasser Ibrahim @Jobilize

Author: Yasser Ibrahim

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Question 98 / 297: What is the result of compiling and running the following code?

interface Chewable {}
interface Eatable extends Chewable{}
class Food implements Chewable { }
class Meat extends Food {}
class Gum implements Chewable{}

public class Tester {

	public static void main(String[] args) {
		
		Food food = new Food();
		Meat meat = new Meat();
		Gum gum   = new Gum();
		
		System.out.print(food instanceof Eatable);
		System.out.print(meat instanceof Food);
		System.out.print(gum instanceof Food);
		System.out.print(gum instanceof Chewable);

	}
}

Oracle Certified Professional Java Programmer Yasser Ibrahim using instanceof in java

A truetruetrutrue

B truetruefalsetrue

C falsetruefalsetrue

D Compilation error

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Explanation:

Compilation error because of "gum instanceof Food"

The operands of instanceof must be in the same inheritance tree.

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