The following Java exercise(s) are designed for intermediate level programmers. If the level is too hard, then I recommend to select an easier one or you might consider 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: Abstract classes in Java.
What happens when the following program is compiled and run?
public abstract class Base { int x = 2; public Base() { System.out.print("-x" + x); x ++ ; } abstract int calculate(); abstract int calculate(int i); } public class MySuper extends Base { public MySuper() { System.out.print("-x" + calculate(2)); } int calculate(){ return x; } int calculate(int i){ return i * x; } } public class Sub extends MySuper { int calculate(){ return x + 2; } public static void main(String[] args){ Sub sub = new Sub(); System.out.print("-x" + sub.calculate()); } }
Quiz 2: Abstract classes and methods
What happens when the following program is compiled and run?
public abstract class Base { int z = 6; public Base() { z -= 2; System.out.print("-z" + method(3,8)); } abstract int method(int i); abstract int method(int i, int i2); } public class Sub extends Base { int z = 2; public Sub() { System.out.print("-z" + method(4)); } int method(int i){ return(z * i + super.z); } int method(int i, int i2){ return(method(i) + i + i2); } public static void main(String[] args){ Sub sub = new Sub(); } }
Article: Java abstract classes Quizzes: Beginner Intermediate Advanced |
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