Java

Question 1

What is Java?

Answer 1

It is an object-oriented, class-based, platform independent programming language that produces software for multiple platforms

Question 2

What is Object Oriented Programming (OOP)?

Answer 2

Programming focused on creating objects that contain both data and methods. Key features include: encapsulation, abstraction, polymorphism, and inheritance

Question 3

What is encapsulation in Java?

Answer 3

The mechanism of wrapping data (variables) and code acting on the data (methods) as a single unit. Ex. A class: bundles data and methods under a single unit

Question 4

Explain polymorphism in Java.

Answer 4

Directly translated means, “many forms” and describes how an object can occur in different forms. Ex: Java allows for defining one interface with multiple implementations. This is seen in method overloading and overriding

Question 5

What is method overloading?

Answer 5

When two or more methods in the same class have the same name but different parameters. Ex no-args constructors and custom method of the same name

Question 6

Explain method overriding.

Answer 6

The ability of a method in a child class to give its own implementation of a method derived from the parent class.

Question 7

What is inheritance in Java?

Answer 7

Allows the creation of a new class from an existing class. The new child class will inherit all public and private methods from the parent class

Question 8

What is abstraction in Java?

Answer 8

The process of hiding implementation details from the user, only showing the functionality

Question 9

Main features added to Java 8?

Answer 9

Java 8 is a major update to the programming language which introduced a significant upgrade to the functional programming called the Lambda Expressions. Java 8 also gets a new and improved Date/Time API, an enhanced JavaScript engine, new streaming API. Concurrent accumulators, secure random generation, and much more.