Question

Write code in java using the LinkedList connecting two different classes. For example, Employee and EmployeeList are two different classes that are used to create the assignment.

Answer 1

Employee Class Code:

public class Employee {
        //attributes
        private String empCode;
        private String fname;
        private String lname;
        
        //Constructor
        public Employee(String empCode,String fname,String lname)
        {
                this.empCode=empCode;
                this.fname=fname;
                this.lname=lname;
        }
        
        //getter methods
        public String getEmpCode() {
                return empCode;
        }
        public String getFname() {
                return fname;
        }
        public String getLname() {
                return lname;
        }
        
        //Setter methods
        public void setEmpCode(String empCode) {
                this.empCode = empCode;
        }
        public void setFname(String fname) {
                this.fname = fname;
        }
        public void setLname(String lname) {
                this.lname = lname;
        }
        
        //toString method
        @Override
        public String toString() {
                return "Employee [empCode=" + empCode + "\tFirst Name=" + fname + "\tLast Name=" + lname + "]";
        }
}

EmployeeList Class Code:

import java.util.LinkedList;

public class EmployeeList {
        // LinkedList to hold Employees
        LinkedList<Employee> employees;
        // to hold number of employees in list
        int noOfEmployees;

        // Constructor to create EmployeeList
        public EmployeeList() {
                this.employees = new LinkedList<Employee>();
                this.noOfEmployees = 0;
        }

        // Method add employee to list
        public void addEmployee(Employee e) {
                employees.add(e);
                this.noOfEmployees++;
        }

        // Method to remove employee from list
        public void removeEmployee(Employee e) {
                employees.remove(e);
                this.noOfEmployees--;
        }

        // method to get number of employees in list
        public int getNumberOfEmployees() {
                return this.noOfEmployees;
        }

        // method to get all employee details as string
        public String getAllEmployees() {
                String s = "";
                for (Employee e : employees) {
                        s += e + "\n";
                }
                return s;
        }

        // Main method
        public static void main(String[] args) {

                // Creating EmployeeList
                EmployeeList list = new EmployeeList();

                // Creating Employee Objects
                Employee e1 = new Employee("emp1", "kowlutla", "Magali");
                Employee e2 = new Employee("emp2", "Hindu", "Maruvada");
                Employee e3 = new Employee("emp3", "Krishna", "Kalluri");
                Employee e4 = new Employee("emp4", "Roopa", "Banavath");
                Employee e5 = new Employee("emp5", "Deepu", "Magali");
                Employee e6 = new Employee("emp6", "Aruna", "Boya");

                // Adding Employees to list using addEmployee method
                list.addEmployee(e1);
                list.addEmployee(e2);
                list.addEmployee(e3);
                list.addEmployee(e4);
                list.addEmployee(e5);
                list.addEmployee(e6);

                // printing number of employees in list
                                System.out.println("Number of employees in list: " + list.getNumberOfEmployees());
                // getting all employee details
                System.out.println("Employee Details:");
                System.out.println(list.getAllEmployees());

                // removing employee from list
                list.removeEmployee(e5);

                // printing number of employees in list
                System.out.println("Number of employees in list After removing one employee: " + list.getNumberOfEmployees());
                // getting all employee details
                System.out.println("Employee Details: ");
                System.out.println(list.getAllEmployees());

        }
}

Output Of Above Code:

Number of employees in list: 6
Employee Details:
Employee [empCode=emp1  First Name=kowlutla     Last Name=Magali]
Employee [empCode=emp2  First Name=Hindu        Last Name=Maruvada]
Employee [empCode=emp3  First Name=Krishna      Last Name=Kalluri]
Employee [empCode=emp4  First Name=Roopa        Last Name=Banavath]
Employee [empCode=emp5  First Name=Deepu        Last Name=Magali]
Employee [empCode=emp6  First Name=Aruna        Last Name=Boya]

Number of employees in list After removing one employee: 5
Employee Details: 
Employee [empCode=emp1  First Name=kowlutla     Last Name=Magali]
Employee [empCode=emp2  First Name=Hindu        Last Name=Maruvada]
Employee [empCode=emp3  First Name=Krishna      Last Name=Kalluri]
Employee [empCode=emp4  First Name=Roopa        Last Name=Banavath]
Employee [empCode=emp6  First Name=Aruna        Last Name=Boya]

Images Of Code:

Image Of Employee Class Code;

Images Of EmployeeList Class Code:

Image Of Output: