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Java Extended
course content

Conteúdo do Curso

Java Extended

Java Extended

1. Deep Java Structure
How does the compiler works?Data transfer in JavaFinal KeywordImporting LibrariesUsing Libraries In Our CodeTernary OperatorEnhanced Switch Statement
2. Methods
What is a Method?Creating Our Own MethodsChallenge: Names Starting with Letter BVoidMethods PracticeMethod Overloading RecursionSorting Even Numbers Challenge
3. String Advanced
Deeper into StringMethod split()Uppercase Even Words ChallengeindexOf() methodCharacter Indices Sum Challengetrim() MethodSubstring First and Last Characters Challenge
4. Classes
What is class?Main Class and MethodAccess modifiersClass CreationCat Meowing ChallengeConstructorTeam Constructor ChallengeMethod toString()Parrot Information Display Challenge
5. Classes Advanced
Complex Classes UsagePet and Owner Relationship ChallengePrivate ModifierAnimal Information Display ChallengeGetter and SetterCountry Information Management ChallengeSummary

Class Creation

Class Syntax

The syntax for creating a class is quite simple. Let's take a look at an example with the class Person:

java

Person

copy

              
123

            
class Person {

}

This is all it takes to create a class. However, it will be useless to us if it's empty. Therefore, we should add fields to it. Let's assume that our person has a name, gender, and age:

java

Person

copy

              
12345

            
class Person {
    String name;
    String gender;
    int age;
}

And now, let's write a method that allows our Person to report their name and age:

java

Person

copy

              
123456789

            
class Person {
    String name;
    String gender;
    int age;
    
    void introduce() {
        System.out.println("Hi, my name is " + name + " and I am " + age + " years old!");
    }
}

Tarefa

Great! Now your task is to create two objects of the Person class in the main method. One will be named Bob and will be 30 years old, and the other will be named Alice and will be 27 years old. Then, use the introduce() method on each person to have them introduce themselves.

Tarefa

Great! Now your task is to create two objects of the Person class in the main method. One will be named Bob and will be 30 years old, and the other will be named Alice and will be 27 years old. Then, use the introduce() method on each person to have them introduce themselves.

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Tudo estava claro?

Seção 4. Capítulo 4
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Class Creation

Class Syntax

The syntax for creating a class is quite simple. Let's take a look at an example with the class Person:

java

Person

copy

              
123

            
class Person {

}

This is all it takes to create a class. However, it will be useless to us if it's empty. Therefore, we should add fields to it. Let's assume that our person has a name, gender, and age:

java

Person

copy

              
12345

            
class Person {
    String name;
    String gender;
    int age;
}

And now, let's write a method that allows our Person to report their name and age:

java

Person

copy

              
123456789

            
class Person {
    String name;
    String gender;
    int age;
    
    void introduce() {
        System.out.println("Hi, my name is " + name + " and I am " + age + " years old!");
    }
}

Tarefa

Great! Now your task is to create two objects of the Person class in the main method. One will be named Bob and will be 30 years old, and the other will be named Alice and will be 27 years old. Then, use the introduce() method on each person to have them introduce themselves.

Tarefa

Great! Now your task is to create two objects of the Person class in the main method. One will be named Bob and will be 30 years old, and the other will be named Alice and will be 27 years old. Then, use the introduce() method on each person to have them introduce themselves.

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

Tudo estava claro?

Seção 4. Capítulo 4
toggle bottom row

Class Creation

Class Syntax

The syntax for creating a class is quite simple. Let's take a look at an example with the class Person:

java

Person

copy

              
123

            
class Person {

}

This is all it takes to create a class. However, it will be useless to us if it's empty. Therefore, we should add fields to it. Let's assume that our person has a name, gender, and age:

java

Person

copy

              
12345

            
class Person {
    String name;
    String gender;
    int age;
}

And now, let's write a method that allows our Person to report their name and age:

java

Person

copy

              
123456789

            
class Person {
    String name;
    String gender;
    int age;
    
    void introduce() {
        System.out.println("Hi, my name is " + name + " and I am " + age + " years old!");
    }
}

Tarefa

Great! Now your task is to create two objects of the Person class in the main method. One will be named Bob and will be 30 years old, and the other will be named Alice and will be 27 years old. Then, use the introduce() method on each person to have them introduce themselves.

Tarefa

Great! Now your task is to create two objects of the Person class in the main method. One will be named Bob and will be 30 years old, and the other will be named Alice and will be 27 years old. Then, use the introduce() method on each person to have them introduce themselves.

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

Tudo estava claro?

Class Syntax

The syntax for creating a class is quite simple. Let's take a look at an example with the class Person:

java

Person

copy

              
123

            
class Person {

}

This is all it takes to create a class. However, it will be useless to us if it's empty. Therefore, we should add fields to it. Let's assume that our person has a name, gender, and age:

java

Person

copy

              
12345

            
class Person {
    String name;
    String gender;
    int age;
}

And now, let's write a method that allows our Person to report their name and age:

java

Person

copy

              
123456789

            
class Person {
    String name;
    String gender;
    int age;
    
    void introduce() {
        System.out.println("Hi, my name is " + name + " and I am " + age + " years old!");
    }
}

Tarefa

Great! Now your task is to create two objects of the Person class in the main method. One will be named Bob and will be 30 years old, and the other will be named Alice and will be 27 years old. Then, use the introduce() method on each person to have them introduce themselves.

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Seção 4. Capítulo 4
Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
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