Java Inheritance Flashcard

Front

What keyword is used to inherit a class in Java?

Back

extends

Front

What is true about the superclass and subclass relationship in Java?

Back

A subclass cannot access the private members of its superclass.

Front

What is method overriding in Java?

Back

Providing a specific implementation of a method that is already provided by its superclass.

Front

Correct way to call a superclass method from a subclass in Java: super.methodName();, this.methodName();, superclass.methodName();, methodName();

Back

super.methodName();

Front

In Java, which keyword is used to refer to the parent class of a class?

Back

super

Front

Which of the following statements is true about constructors and inheritance in Java?

• A subclass inherits all the constructors of its superclass.
• A subclass must override all the constructors of its superclass.
• Constructors are not inherited.
• Only parameterless constructors are inherited.

Back

Constructors are not inherited.

Front

What is the output of the following code snippet if `class B extends A` and both classes have a method `display()` that prints "A" in class A and "B" in class B, and method `display()` of class B calls `super.display()`?
```java
B obj = new B();
obj.display();
```

Back

AB

Front

Which principle of Object-Oriented Programming is demonstrated by method overriding?

Back

Polymorphism

Front

What access modifier should be used for a superclass method to ensure that it can be overridden by any subclass in any package?

Back

public

Front

What is true about the `super` keyword in Java?

Back

It can be used to call both methods and constructors of the superclass.