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 Find Maximum and Minimum in Array Challenge

3. String Advanced

Deeper into String Method split()Uppercase Even Words Challenge indexOf() method Character Indices Sum Challenge trim() Method Substring First and Last Characters Challenge

4. Classes

What is class?Main Class and Method Access modifiers Class Creation Cat Meowing Challenge Constructor Team Constructor Challenge Method toString()Parrot Information Display Challenge

5. Classes Advanced

Complex Classes Usage Pet and Owner Relationship Challenge Private Modifier Animal Information Display Challenge Getter and Setter Country Information Management Challenge Summary

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:

Person


              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:

Person


              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:

Person


              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!");
    }
}

Task

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.

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

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 4. Chapter 4

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:

Person


              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:

Person


              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:

Person


              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!");
    }
}

Task

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

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 4. Chapter 4

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:

Person


              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:

Person


              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:

Person


              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!");
    }
}

Task

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

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

Everything was clear?

Thanks for your feedback!

Class Syntax

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

Person


              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:

Person


              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:

Person


              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!");
    }
}

Task

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

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

Section 4. Chapter 4

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