Java Inheritance Programming - Person Class with methods called getFirstName() and getLastName()

Java Inheritance: Exercise-7 with Solution

Write a Java program to create a class known as Person with methods called getFirstName() and getLastName(). Create a subclass called Employee that adds a new method named getEmployeeId() and overrides the getLastName() method to include the employee's job title.

Sample Solution:

Java Code:

// Person.java
// Parent class Person

// Define the Person class
public class Person {
    // Private fields for first name and last name
    private String firstName;
    private String lastName;

    // Constructor to initialize first name and last name
    public Person(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    // Method to get the first name
    public String getFirstName() {
        return firstName;
    }

    // Method to get the last name
    public String getLastName() {
        return lastName;
    }
} 

// Employee.java
// Child class Employee

// Declare the Employee class which extends the Person class
public class Employee extends Person {
    
    // Private instance variable for employee ID
    private int employeeId;
    
    // Private instance variable for job title
    private String jobTitle;

    // Constructor for Employee class, taking first name, last name, employee ID, and job title as parameters
    public Employee(String firstName, String lastName, int employeeId, String jobTitle) {
        // Call the constructor of the superclass (Person) with first name and last name
        super(firstName, lastName);
        // Initialize the employeeId instance variable
        this.employeeId = employeeId;
        // Initialize the jobTitle instance variable
        this.jobTitle = jobTitle;
    }

    // Public method to get the employee ID
    public int getEmployeeId() {
        return employeeId;
    }

    // Override the getLastName method from the superclass (Person)
    @Override
    public String getLastName() {
        // Return the last name from the superclass combined with the job title
        return super.getLastName() + ", " + jobTitle;
    }
} 

// Main.java
// Main class

// Declare the Main class
public class Main {
    
    // Main method to execute the program
    public static void main(String[] args) {
        
        // Create an Employee object named employee1 with first name, last name, employee ID, and job title
        Employee employee1 = new Employee("Kortney", "Rosalee", 4451, "HR Manager");
        
        // Print the first name, last name with job title, and employee ID of employee1
        System.out.println(employee1.getFirstName() + " " + employee1.getLastName() + " (" + employee1.getEmployeeId() + ")");
        
        // Create an Employee object named employee2 with first name, last name, employee ID, and job title
        Employee employee2 = new Employee("Junior", "Philipa", 4452, "Software Manager");
        
        // Print the first name, last name with job title, and employee ID of employee2
        System.out.println(employee2.getFirstName() + " " + employee2.getLastName() + " (" + employee2.getEmployeeId() + ")");
    }
} 

Output:

Kortney Rosalee, HR Manager (4451)
Junior Philipa, Software Manager (4452)

Explanation:

The Person class has two private instance variables, firstName and lastName, and two public methods, getFirstName() and getLastName(), that return the values of these variables.

The Employee class is a subclass of Person, and adds two private instance variables, employeeId and jobTitle, as well as a public method called getEmployeeId(). It also overrides the getLastName() method from the Person class to include the employee's jobTitle.

In the above Main class, we create two instances of the Employee class, namely "employee1" and "employee2".

"employee1" is initialized with the values "Kortney" for the first name, "Rosalee" for the last name, 4451 for the employee ID, and "HR Manager" for the job title. Employee1's getFirstName(), getLastName(), and getEmployeeId() methods of "employee1" are called. Their return values are concatenated into a string, which is printed to the console.

Similarly, Employee2's getFirstName(), getLastName(), and getEmployeeId() methods of employee2 are called. Their return values are concatenated into a string, which is printed to the console.

Flowchart:

Java Code Editor:

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