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();
What is the ability of different classes to respond to the same method call known as?
In Java, can a subclass object be assigned to a superclass reference variable?
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?
Suppose there is a Car class that extends the Vehicle class and whose constructor takes in the “brand” and “year” parameters. What is the static type and dynamic type of the variable "lambo" in the following code?
Car lambo = new Car(“Lamborghini”, 2005);
In a class hierarchy where Class B extends Class A, and Class C extends Class B, which method would be invoked if a method in Class A is overridden by both Classes B and C and an object of type C calls the method?
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In Java, what indicates that polymorphism has been used effectively in code design?
Given a superclass Animal and subclasses Dog and Cat that override a makeSound() method, which line of code demonstrates polymorphism?
What is the purpose of polymorphism in object-oriented programming?