Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Class Creation | Classes
Java Extended
course content

Зміст курсу

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 RecursionFind Maximum and Minimum in Array Challenge
3. String Advanced
Deeper into StringMethod split()Uppercase Even Words ChallengeindexOf() methodCharacter Indices Sum Challengetrim() MethodEmail Validation 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 SetterUpdating User InformationSummary

bookClass 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!");
    }
}

Завдання

Alice wants to find a friend within a specific age range (25 - 30, inclusive). You need to write a program that checks whether Bob meets Alice's criteria. If Bob's age falls within the specified range, the program should return true; otherwise, it should return false.

  1. In the main method, you need to pass the correct object as the first parameter to the findFriend method.
  2. In the findFriend method, compare the age of the passed object with the specified age range (25 - 30).
  3. If the object falls within the age range, return true; otherwise, return false.
  4. To display the result on the screen, use the foundFriend variable, which stores the result of the search.

Switch to desktopПерейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів
Все було зрозуміло?

Як ми можемо покращити це?

Дякуємо за ваш відгук!

Секція 4. Розділ 4
toggle bottom row

bookClass 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!");
    }
}

Завдання

Alice wants to find a friend within a specific age range (25 - 30, inclusive). You need to write a program that checks whether Bob meets Alice's criteria. If Bob's age falls within the specified range, the program should return true; otherwise, it should return false.

  1. In the main method, you need to pass the correct object as the first parameter to the findFriend method.
  2. In the findFriend method, compare the age of the passed object with the specified age range (25 - 30).
  3. If the object falls within the age range, return true; otherwise, return false.
  4. To display the result on the screen, use the foundFriend variable, which stores the result of the search.

Switch to desktopПерейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів
Все було зрозуміло?

Як ми можемо покращити це?

Дякуємо за ваш відгук!

Секція 4. Розділ 4
toggle bottom row

bookClass 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!");
    }
}

Завдання

Alice wants to find a friend within a specific age range (25 - 30, inclusive). You need to write a program that checks whether Bob meets Alice's criteria. If Bob's age falls within the specified range, the program should return true; otherwise, it should return false.

  1. In the main method, you need to pass the correct object as the first parameter to the findFriend method.
  2. In the findFriend method, compare the age of the passed object with the specified age range (25 - 30).
  3. If the object falls within the age range, return true; otherwise, return false.
  4. To display the result on the screen, use the foundFriend variable, which stores the result of the search.

Switch to desktopПерейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів
Все було зрозуміло?

Як ми можемо покращити це?

Дякуємо за ваш відгук!

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!");
    }
}

Завдання

Alice wants to find a friend within a specific age range (25 - 30, inclusive). You need to write a program that checks whether Bob meets Alice's criteria. If Bob's age falls within the specified range, the program should return true; otherwise, it should return false.

  1. In the main method, you need to pass the correct object as the first parameter to the findFriend method.
  2. In the findFriend method, compare the age of the passed object with the specified age range (25 - 30).
  3. If the object falls within the age range, return true; otherwise, return false.
  4. To display the result on the screen, use the foundFriend variable, which stores the result of the search.

Switch to desktopПерейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів
Секція 4. Розділ 4
Switch to desktopПерейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів
some-alt