Java Basics

Java Basics

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1. Getting Started

In this section, you will get acquainted with Java, understand its peculiarities, and why I would recommend learning this particular programming language. You will write your first Java code and familiarize yourself with printing text to the console. Shall we begin?

Backend Development

Role of Java in the Backend

Java Advantages

Memory Types In Java

Your First Program

2. Basic Types, Operations

We have completed a theoretical course, and now the most interesting part begins. In this section, we will familiarize ourselves with the basics of coding, primitive data types, and operations on them. Now your code can perform mathematical tasks and evaluate conditions for further execution. Sounds interesting? Let's start getting acquainted.

Primitive Data Types

Primitive Types Challenge

Char and ASCII Table

Mathematical Operations in Java

If-Else Statement

Switch-Case Statement

Weekday Switch Challenge

3. Loops

In this section, we will familiarize ourselves with various loops such as for, while, and do-while. Loops are essential to any programming language, as they allow us to efficiently iterate over a large amount of data and save significant time. Later on, you will use loops extensively in tasks like sorting, working with arrays, collections, and more. Well then, let's get started.

Introduction to Loops

Increment and Decrement

Infinite Loop (bonus)

Challenge: Factorial

4. Arrays

This section will cover arrays and how to use them correctly. We will learn how to group data into arrays and explore some methods for working with arrays. Arrays are essential to any programming language Java, so let's dive in.

Using Loops with Arrays

Index Out Of Bounds

Two-Dimentional Array

Iteration In Two-Dimensional Array

5. String

In this section, you will be introduced to a data type called String. Why is there a separate section in the course for this data type? String is a significant data type with many built-in methods and operations. In this course, you will learn about String and StringBuilder, explore their basic methods, and learn how to use strings effectively in Java. So, are you ready to get started?

What Is String?

Basic Methods In String Part 1

Basic Methods In String Part 2

B-Inclusion Filter Challenge

NullPointer Exception

String Pool, Method Equals()

Infinite Loop (bonus)

What is an Infinite Loop?

An infinite loop is a loop that continues executing indefinitely without a condition that would cause it to terminate. This can result in your program becoming unresponsive or consuming excessive system resources.

Here's an example of an infinite loop in Java:

Main


              123
            
while (true) {
    // Code to be executed indefinitely
}

To avoid infinite loops:

Ensure a proper termination condition: Double-check that your loop has a well-defined termination condition. The condition should eventually evaluate as false, allowing the loop to exit;

Example:

Main


              12345
            
int count = 0;
while (count < 10) {
    // Code to be executed
    count++;
}

Utilize loop control statements such as break or return to explicitly exit the loop when a specific condition is met.

Example:

Main


              123456
            
while (true) {
    // Code to be executed
    if (condition) {
        break; // Exit the loop
    }
}

Note

Always remember to thoroughly review and test your code to detect and prevent infinite loops. Utilizing appropriate termination conditions and incorporating loop control statements can be highly effective in avoiding them. 

1. Which loop construct in Java is best suited when the number of iterations is known?

2. Which keyword is used to exit a loop prematurely?

Everything was clear?

Thanks for your feedback!

Section 3. Chapter 6

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