Practice More Questions From: Quiz 1: Inheritance & Polymorphism – Overriding
Q:
Let’s say there are three classes: Laptop, MacBook and ThinkPad. What are the likely relationships between these classes?
Q:
Which of the following is true if a class Shape has a subclass Circle?
Q:
A subclass can inherit both instance variables and methods.
Q:
Which of the following is the correct syntax for defining a new class A based on the superclass B?
Q:
What will be the output of the following program? class A { public void display() { System.out.print(“One”); } } class B extends A { @Override public void display() { System.out.print(“Two”); } } public class C { public static void main(String args[]) { B screen = new B(); screen.display(); } }
Q:
What will be the output of the following program? class A { public void display() { System.out.print(“One”); } } class B extends A { @Override public void display() { super.display(); System.out.print(“Two”); } } public class C { public static void main(String args[]) { B screen = new B(); screen.display(); } }
Q:
What’s the usage of the java keyword ‘super’?
Q:
What restriction is there on using the super reference in a constructor?
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