Arrays in Java with Coding Examples

In this post, we are going to learn about what is arrays in Java, Syntax for array in Java, How they work, and how it helps us to store multiple elements. We will also go through some simple coding examples to help you understand the concept better.

What is an Array in Java?

An array in Java is a data structure that allows us to store multiple values in a single variable. So Instead of declaring separate variables for each value, we can just create an array to store them all together in a fixed-size list. But in array, we can store only similar type of elements that simply means If we have created an integer array then we are allowed to store only integer type of elements in it and If we try to store other than integer type elements like double or String then we will get an compile time error saying incompatible types.

Strings in Java with Coding Examples

Strings are very important in Java or any other programming language because they are used to store and manipulate text data. We cannot even imagine an application or website without having text on it. In almost every application, we need to work with text data, whether it is accepting input from the user or displaying a message to the user. It is also important to know about Strings and how it works internally if you are preparing for Java interviews. So knowing about Strings in Java is very important for both students and job seekers.

In this tutorial, we will learn what is a String in Java with its different types like String, StringBuffer, and StringBuilder. 

Abstraction in Java with Bank ATM Example

In the previous post we learned what is polymorphism in Java. In this post, we are going to learn about another important concept of OOPs in Java which is Abstraction.

Abstraction in Java simply means hiding certain details from the user and showing only essential information to the user.

• Here is a real-life example of abstraction: Through the ATM machine, banks only show essential information to people, such as withdrawing money and checking account balances, by hiding the internal implementation or mechanism.
• Another real-life example of abstraction is 

Polymorphism in Java with Examples

In the previous post, we learned about what is encapsulation in Java with its examples. In this post, we will learn about polymorphism in Java and how it works. So, without wasting any time, let's get into the discussion.

The term "polymorphism" means having many forms. In simple terms, it refers to the ability of something to exist in different forms or have different behaviors. It allows us to perform a single action in different or multiple ways. 

Here is a real-life example of Polymorphism:

Encapsulation in Java with Examples

In the previous post, we learned what is inheritance in Java with its different types and their examples. In this tutorial, we are going to learn what is encapsulation in Java with its examples.

Encapsulation in Java means binding data and code together into a single unit.

In simple words, Encapsulation is like putting things inside a box and controlling who can access them. In Java, we use classes to create these boxes. Each box (class) has some data (variables) and actions (methods) that can be performed on that data.

Inheritance in Java with Examples

In this tutorial, we are going to learn about what is inheritance in Java with its different types and how to implement each type with coding examples. Learning inheritance in Java is crucial because it is a very important concept of object-oriented programming(OOP). Interviewers often ask interview questions on the inheritance concept in Java to test your knowledge and ability to apply inheritance to solve real-world problems to develop efficient systems.    

Top 15+ OOP's Interview Questions and Answers

In this post, we will learn which interview questions on OOPs (Object-Oriented Programming) are mostly asked in interviews. In OOPs, the questions are usually focused on OOPs concepts like inheritance, abstraction, encapsulation, and polymorphism. There are many questions in object-oriented programming because it is a very important concept and style of programming. That's why interviewers ask most questions on it.