Inheritance in Object-Oriented Programming
Given the following code:
class A {
public void show() {
System.out.println("A");
}
}
class B extends A {
public void show() {
System.out.println("B");
}
}
What will be the output when the following code is executed?
A obj1 = new A();
B obj2 = new B();
A obj3 = new B();
...
Assume the following code is valid. What is the static type and dynamic type of the variable "ref"?
G ref = new H();
In Java, can a subclass object be assigned to a superclass reference variable?
What is the ability of different classes to respond to the same method call known as?
Which statement is true when a superclass reference refers to a subclass object in Java?
If an abstract class Shape has a non-abstract method draw(), and Circle is a subclass that does not override draw(), what happens when (Shape)new Circle().draw() is executed?
In a game where Player is an abstract class and Archer and Knight are subclasses, which approach best utilizes polymorphism when implementing attack behaviors specific to archers and knights?
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Given an array list 'animals' containing instances of various classes such as Dog, Cat, and Bird that all extend Animal and override speak(), what will be the Big O time complexity when sequentially calling speak() on each element?
In Java, why would you choose composition over inheritance when designing long-term evolutionary software systems?
Given a superclass Animal and subclasses Dog and Cat that override a makeSound() method, which line of code demonstrates polymorphism?