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

Using Libraries In Our Code

java.util.Arrays

Let's move on to practice, and as an example, we will use the library java.util.Arrays. We can see that the parent library is java, followed by the child library util, and then the specific library we need, Arrays.

Main


              1
            
import java.util.Arrays;

We have already mentioned this library in the course on arrays when discussing array methods. Now, let's see how we can use these methods in code using an example:

Main


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package com.example;

// do not modify the code below this comment

// importing Arrays library into our code
import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        // creating an int array with some unsorted values
        int[] array = {1, 5, 6, 2, 0, -4, 2};  
        // using Arrays library to sort our elements
        Arrays.sort(array);  
        // printing each element from the sorted array to the console
        for (int element : array) {  
            System.out.print(element + " ");
        }
    }
}

Let's go through the code written above.

We import the necessary library and use a class from that library to call its sorting method. You can see the syntax of how we use it: ClassName.methodName(array);. You can also see that the sorted array is printed in the console, with values displayed from smallest to largest. The method we imported from the Arrays library handled the sorting.

Let's also take a look at another method from Arrays - fill.

Main


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package com.example;

// do not modify the code below this comment

// importing Arrays library into our code
import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        // creating an int array with some different values
        int[] array = {1, 5, 6, 2, 0, -4, 2};  
        // using Arrays library to fill the array with the value "1"
        Arrays.fill(array, 1);  
        // printing each element from the filled array to the console
        for (int element : array) {  
            System.out.print(element + " ");
        }
    }
}

We have the same integer array, but we're not sorting it this time. Instead, we're replacing each element of the array with a specified value. Notice that we first specify the array we want to fill in the parentheses, and then we provide the value with which we want to fill the array.

After all the operations, you can see that the array displayed on the screen consists of all elements equal to 1.

Task

Swipe to show code editor

Import the Arrays library.
Sort the given array of char elements.
Display the sorted array on the screen.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 1. Chapter 5

Using Libraries In Our Code

java.util.Arrays

Main


              1
            
import java.util.Arrays;

We have already mentioned this library in the course on arrays when discussing array methods. Now, let's see how we can use these methods in code using an example:

Main


              12345678910111213141516171819
            
package com.example;

// do not modify the code below this comment

// importing Arrays library into our code
import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        // creating an int array with some unsorted values
        int[] array = {1, 5, 6, 2, 0, -4, 2};  
        // using Arrays library to sort our elements
        Arrays.sort(array);  
        // printing each element from the sorted array to the console
        for (int element : array) {  
            System.out.print(element + " ");
        }
    }
}

Let's go through the code written above.

Let's also take a look at another method from Arrays - fill.

Main


              12345678910111213141516171819
            
package com.example;

// do not modify the code below this comment

// importing Arrays library into our code
import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        // creating an int array with some different values
        int[] array = {1, 5, 6, 2, 0, -4, 2};  
        // using Arrays library to fill the array with the value "1"
        Arrays.fill(array, 1);  
        // printing each element from the filled array to the console
        for (int element : array) {  
            System.out.print(element + " ");
        }
    }
}

After all the operations, you can see that the array displayed on the screen consists of all elements equal to 1.

Task

Swipe to show code editor

Import the Arrays library.
Sort the given array of char elements.
Display the sorted array on the screen.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 1. Chapter 5

Switch to desktop for real-world practiceContinue from where you are using one of the options below