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 |
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);
}
}
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);
}
}
|
Article: Java abstract classes Quizzes: Beginner Intermediate Advanced |
Suggested Articles
|
Sar Maroof is a professional software development teacher, gives master classes and publishes technical articles. He is also an expert software developer and worked for several big as well as small companies and later as a freelancer. |
Subscribe to Sar Maroof's RSS feeds!
Mail this page to a friend!
Bookmark this page! |
