Hi @Emilio_Parra !!
Your question is not dumb at all! It’s great that you’re seeking clarification.
class Date {
private int day;
private int month;
private int year;
// Default constructor
public Date() {
// We must define the default values for day, month, and year
day = 0;
month = 0;
year = 0;
}
// Parameterized constructor
public Date(int d, int m, int y){
// The arguments are used as values
day = d;
month = m;
year = y;
}
// A simple print function
public void printDate(){
System.out.println("Date: " + day + "/" + month + "/" + year);
}
}
class Demo {
public static void main(String args[]) {
// Call the Date constructor to create its object;
Date date = new Date(1, 8, 2018); // Object created with specified values! // Object created with default values!
date.printDate();
}
}
In the code , the purpose of the Demo
class is to demonstrate the usage of the Date
class. It serves as a separate class that contains the main
method, which is the entry point of the Java program. The main
method is automatically executed when you run the program.
By placing the code that demonstrates the usage of the Date
class in the main
method of the Demo
class, it allows for a clear separation of concerns. The Date
class is responsible for managing date-related operations, while the Demo
class is responsible for showcasing how the Date
class can be used.
This separation of concerns is a common practice in software development. It helps to improve code organization, readability, and maintainability. Additionally, it makes it easier to understand and test individual components of the program.
Printing the output directly within the constructors or the main
method is possible, but it may not be ideal in all situations. For example, if you have multiple constructors or if you want to demonstrate different use cases of the Date
class, having a separate class like Demo
allows you to organize and present the code in a more structured manner.
In summary, using the Demo
class to execute the program with prints helps in separating concerns, improving code organization, and presenting the code in a more structured way for demonstration purposes.
I hope it helps. Happy Learning