Conteúdo do Curso

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

Final Keyword

How to prevent changing the value of a variable

For this purpose, Java has a keyword called final. Let's consider a code snippet where we use this keyword:

Main


              123456789101112
            
package com.example;

public class Main {
    public static void main(String[] args) {
        int number = 10;
        final int finalNumber = 5;
        number = 15;
        finalNumber = 20;
        System.out.println(number);
        System.out.println(finalNumber);
    }
}

You can see that in the code above, we have created two variables of type int, but one of them is marked with the final keyword. When we try to change the value of this variable, the compiler tells us about an error. Specifically, it indicates that we cannot modify a value that is marked with the final keyword.

What can we use final keyword for:

To create constants. A constant is a variable whose value cannot be changed after it has been initialized. In Java, constants are always declared using the final keyword;
To indicate that the value of a variable is final and should not be modified;
To prevent accidental modification of a final variable's value in our code.

Tarefa

Swipe to show code editor

Your task is to add the final keyword before the variables that are not modified later in the code.

_{Once you've completed this task, click the button below the code to check your solution.}

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Tudo estava claro?

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Seção 1. Capítulo 3

Final Keyword

How to prevent changing the value of a variable

For this purpose, Java has a keyword called final. Let's consider a code snippet where we use this keyword:

Main


              123456789101112
            
package com.example;

public class Main {
    public static void main(String[] args) {
        int number = 10;
        final int finalNumber = 5;
        number = 15;
        finalNumber = 20;
        System.out.println(number);
        System.out.println(finalNumber);
    }
}

What can we use final keyword for:

To create constants. A constant is a variable whose value cannot be changed after it has been initialized. In Java, constants are always declared using the final keyword;
To indicate that the value of a variable is final and should not be modified;
To prevent accidental modification of a final variable's value in our code.

Tarefa

Swipe to show code editor

Your task is to add the final keyword before the variables that are not modified later in the code.

_{Once you've completed this task, click the button below the code to check your solution.}

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo

Tudo estava claro?

Obrigado pelo seu feedback!

Seção 1. Capítulo 3

Final Keyword

How to prevent changing the value of a variable

For this purpose, Java has a keyword called final. Let's consider a code snippet where we use this keyword:

Main


              123456789101112
            
package com.example;

public class Main {
    public static void main(String[] args) {
        int number = 10;
        final int finalNumber = 5;
        number = 15;
        finalNumber = 20;
        System.out.println(number);
        System.out.println(finalNumber);
    }
}

What can we use final keyword for:

To create constants. A constant is a variable whose value cannot be changed after it has been initialized. In Java, constants are always declared using the final keyword;
To indicate that the value of a variable is final and should not be modified;
To prevent accidental modification of a final variable's value in our code.

Tarefa

Swipe to show code editor

Your task is to add the final keyword before the variables that are not modified later in the code.

_{Once you've completed this task, click the button below the code to check your solution.}

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo

Tudo estava claro?

Obrigado pelo seu feedback!

How to prevent changing the value of a variable

For this purpose, Java has a keyword called final. Let's consider a code snippet where we use this keyword:

Main


              123456789101112
            
package com.example;

public class Main {
    public static void main(String[] args) {
        int number = 10;
        final int finalNumber = 5;
        number = 15;
        finalNumber = 20;
        System.out.println(number);
        System.out.println(finalNumber);
    }
}

What can we use final keyword for:

To create constants. A constant is a variable whose value cannot be changed after it has been initialized. In Java, constants are always declared using the final keyword;
To indicate that the value of a variable is final and should not be modified;
To prevent accidental modification of a final variable's value in our code.

Tarefa

Swipe to show code editor

Your task is to add the final keyword before the variables that are not modified later in the code.

_{Once you've completed this task, click the button below the code to check your solution.}

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo

Seção 1. Capítulo 3

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo