Demo - Customer - The if-else-if Statement

The if-else-if statement tests a series of conditions. It is often simpler to test a series of conditions with the if-else-if statement than with a set of nested if-else statements.

package CustomerDemo;
// Author: Kevin Roark
// Customer  class
public class Customer {
    private String firstName;
    private String lastName;
    private int points;
    private String rewardLevel;

    //Constructor
    public Customer(String firstName, String lastName, int points) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.points = points;
        this.rewardLevel = "NA";
    }
    public Customer() {
        this.firstName = "Unknown";
        this.lastName = "Unknown";;
        this.points = 0;
        this.rewardLevel = "NA";
    }

    //Getters and Setters
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public int getPoints() {
        return points;
    }
    public void setPoints(int points) {
        this.points = points;
    }
    public String getRewardLevel() {
        if(points >= 5000)
            return "Platinum";
        else if (points >= 3000)
            return "Gold";
        else if (points >= 1500)
            return "Silver";
        else return "Bronze";
    }
      public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public String getFullName()
    {
        return firstName + " " + lastName;
    }
    //Public Helper Functions
    public String printInfo()
    {
        String myReturn = "Name: " + getFullName() + "\n";
        myReturn += "Level: " + getRewardLevel() + "\n";
        return myReturn;
    }

}

The Java code you provided defines a Customer class within the CustomerDemo package. Here's what this class entails:

Private Instance Variables: firstName, lastName, points, and rewardLevel are the four private instance variables in the Customer class.
- firstName and lastName are strings representing the customer's first and last names.
- points is an integer that might represent the points a customer has earned (possibly through purchases, rewards, etc.).
- rewardLevel is a string that might represent the level of the customer based on their points (like "Platinum", "Gold", "Silver", "Bronze").
Constructors: There are two constructors in the class.
- The first constructor accepts three parameters: firstName, lastName, and points. It assigns these parameters to the respective instance variables and sets rewardLevel as "NA".
- The second constructor is a no-argument constructor that initializes the firstName and lastName to "Unknown", points to 0, and rewardLevel to "NA".
Getters and Setters: These methods allow controlled access to the instance variables.
- Getters (getLastName(), getPoints(), getRewardLevel(), getFirstName()) return the current value of the respective instance variable.
- Setters (setLastName(String lastName), setPoints(int points), setFirstName(String firstName)) are used to set or update the value of the respective instance variable.
Other methods:
- getRewardLevel() method returns the reward level of the customer based on their points. This method includes an if-else structure that checks the customer's points and assigns a reward level ("Platinum", "Gold", "Silver", "Bronze") accordingly.
- getFullName() method returns the full name of the customer by concatenating the firstName and lastName with a space in between.
- printInfo() is a helper function that returns a string displaying the customer's full name and their reward level.

This class is a representation of a customer in a system that likely tracks customer rewards or a similar customer loyalty program. The system appears to determine a customer's reward level based on the number of points they have accumulated.

Driver:

package CustomerDemo;
// Author: Kevin Roark
// Customer class Demo
import java.util.Scanner; // Import the Scanner class to allow input from the user
public class CustomerDriver {
    public static void main(String[] args)
    {
        Customer myCustomer = new Customer();
        Scanner keyboard = new Scanner(System.in);
        System.out.print("Enter your first Name: ");
        myCustomer.setFirstName(keyboard.nextLine());
        System.out.print("Enter your last Name: ");
        myCustomer.setLastName(keyboard.nextLine());
        System.out.print("Enter your points earned: ");
        myCustomer.setPoints(keyboard.nextInt());
        System.out.println(myCustomer.printInfo());
    }
}