Java Extended

1. Deep Java Structure

Throughout the following lessons, you will become acquainted with the inner workings of Java and discover optimized methods to work with the language. This will involve exploring Java's operations at the computer level and adopting best practices for utilizing familiar concepts efficiently.

How Does the Compiler Works?

Data Transfer in Java

Final Keyword

Importing Libraries

Using Libraries In Our Code

Ternary Operator

Enhanced Switch Statement

2. Methods

You have already encountered methods, and now you will finally understand what they actually are, how to create your own methods, and how to work with them. You will learn to return the desired values from methods and significantly improve the quality and logic of your code.

What is a Method?

Creating Our Own Methods

Challenge: Names Starting with Letter B

Challenge: Find Maximum and Minimum in Array

3. String Advanced

Get ready to dive into the world of String and discover more about its inner workings and methods. We'll explore the fascinating features that String offers, including the ability to customize the "toString" method, split strings into substrings, and utilize indexes for efficient data retrieval. Let's embark on this exciting journey to expand our knowledge of String manipulation!

Deeper into String

Method split()

Challenge: Uppercase Even Words

indexOf() Method

Challenge: Finding the Longest Word

trim() Method

Challenge: Email Validation

4. Classes

In this section, you will learn how to create your own classes and their objects. You will be able to use methods of one class within another and establish relationships between them. Get ready to discover many interesting concepts and delve deeper into OOP programming!

What is Class?

Main Class and Method

Access Modifiers

Class Creation

Challenge: Get Information About the Object

Constructor

Challenge: Team Constructor

Method toString()

Challenge: Parrot Information Display

5. Classes Advanced

In this section, we will continue our study of classes. We will explore more advanced usage of class objects and learn more about access modifiers and how to use them effectively. We will also delve into getters and setters, as they are considered best practices in programming.

Complex Classes Usage

Challenge: Pet and Owner Relationship

Private Modifier

Challenge: Animal Information Display

Getter and Setter

Challenge: Updating User Information

Summary

Course Content

Java Extended

1. Deep Java Structure

How Does the Compiler Works?Data Transfer in Java Final Keyword Importing Libraries Using Libraries In Our Code Ternary Operator Enhanced Switch Statement

2. Methods

What is a Method?Creating Our Own Methods Challenge: Names Starting with Letter B Void Methods Practice Method Overloading Recursion Challenge: Find Maximum and Minimum in Array

3. String Advanced

Deeper into String Method split()Challenge: Uppercase Even Words indexOf() Method Challenge: Finding the Longest Word trim() Method Challenge: Email Validation

4. Classes

What is Class?Main Class and Method Access Modifiers Class Creation Challenge: Get Information About the Object Constructor Challenge: Team Constructor Method toString()Challenge: Parrot Information Display

5. Classes Advanced

Complex Classes Usage Challenge: Pet and Owner Relationship Private Modifier Challenge: Animal Information Display Getter and Setter Challenge: Updating User Information Summary

trim() Method

How can we get rid of extra space characters?

Sometimes a string may have leading or trailing spaces, which can cause issues in our code. However, Java developers have provided a solution for this by introducing the trim() method. What does it do? This method removes leading and trailing spaces from a string. If there are no leading or trailing spaces, the trim() method simply returns the original string. If the entire string consists of spaces, the trim() method will return an empty string.

Main


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package com.example;

// do not modify the code below this comment

public class Main {
    public static void main(String[] args) {
        String string = "   This string contains unnecessary space symbols       ";
        // print the string before using the trim() method
        System.out.println("String before using trim() method: " + string);  
        // print the string after using the trim() method, which removes leading and trailing spaces
        System.out.println("String after using trim() method: " + string.trim());  
    }
}

That's essentially all we can say about this method. However, the trim() method does a lot of good and significantly simplifies working with strings.

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Section 3. Chapter 6