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Beginner Quizzes – Java Abstract Classes

The following Java exercise(s) are designed for beginner level programmers. If the level is too hard, then I recommend reading my article about this topic, which offers a theoretical explanation including more exercises. Read More: Java Abstract Classes

Article: Java abstract classes
Quizzes: Beginner  Intermediate  Advanced 

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Quiz 1: Extending an abstract class

What happens when the following program is compiled and run?

public abstract class MyAbstract {

	abstract int getSum();
	abstract int getSum(int x);
	abstract int getSum(int x, int y);
}

public abstract class Sub extends MyAbstract {

	int x = 4;

	int getSum(){
		return x + x;
	}
	int getSum(int x){
		return x + x;
	}
	int getSum(int x, int y){
		int z = x + y;
		System.out.print(z);
		return z;
	}
	public static void main(String[] args){
		Sub sub = new Sub();
		sub.getSum(4,2);
	}
}

Select the correct answer.



Please, leave your questions, feedback and suggestions in the comments below! If you need more explanation by any of the answers, just let me know to update it for you!

Quiz 2: Abstract classes in Java

What happens when the following program is compiled and run?

public abstract class AbstractClass {

	int b = 6;

	abstract int getNumber(int c, int d);
}

public class Sub extends AbstractClass {

	int b = 2;

	Sub() {
		b = super.b;
	}
	int getNumber(int x, int y){
		int i = x - y + b;
		System.out.print(i);
		return i;
	}
	public static void main(String[] args){
		Sub sub = new Sub();
		sub.getNumber(7,3);
	}
}

Select the correct answer.



Please, leave your questions, feedback and suggestions in the comments below! If you need more explanation by any of the answers, just let me know to update it for you!

Megisoft.com offers a practical method to learn and improve your Java skills. It avoids unnecessary long boring theoretical explanations, but it uses many exercises and quizzes. The author of Megisoft is Sar Maroof who has more than a decade of experience with web development mainly with Java, MySql, HTML and more..
Article: Java abstract classes
Quizzes: Beginner  Intermediate  Advanced 


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Click Here For Info about: Sar Maroof's New Java Book
Author: Sar Maroof
More than a decade of experience with developing web applications mainly with Java.
Sun Certified JSP as well as EJB
CIW Certified Internet Webmaster - Mind IT
Applied Science in Physics HBO Amsterdam
Bachellor Science in Physics at Basra university.

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