Question

1. Create a class called Employee that should include four pieces of information as instance variables—a firstName (type String), a lastName (type String), a mobileNumber (type String) and a salary (type int).
2. Your class (Employee) should have a full argument constructor that initializes the four instance variables.
3. Provide a set and a get method for each instance variable. The validation for each attribute should be like below:
   1. mobileNumber should be started from “05” and the length will be limited to 10 digits.
   2. salary should be greater than zero.
4. In addition, provide a method named getYearlySalary() that calculates the yearly salary (i.e., multiplies the salary by 12), then returns the amount as a double value.
5. The toString() print the following information

Employee Name: FirstName LastName

Mobile No. 0512345678

Employee Salary: 2000

(write in java program)

Answer 1

The JAVA code is :

public class Employee {

        // declaring the value 
        private String firstName, lastName, mobileNumber;
        private int salary;
        
        //using getters and setters to get and set the values
        public String getFirstName() {
                return firstName;
        }
        public void setFirstName(String firstName) {
                this.firstName = firstName;
        }
        public String getLastName() {
                return lastName;
        }
        public void setLastName(String lastName) {
                this.lastName = lastName;
        }
        public String getMobileNumber() {
                return mobileNumber;
        }
        public void setMobileNumber(String mobileNumber) {
                this.mobileNumber = mobileNumber;
        }
        public int getSalary() {
                return salary;
        }
        public void setSalary(int salary) {
                this.salary = salary;
        }
        // using parameterized constructor to initiallize the values 
        public Employee(String firstName, String lastName, String mobileNumber, int salary) {
                
                this.firstName = firstName;
                this.lastName = lastName;
                this.mobileNumber = mobileNumber;
                this.salary = salary;
        }
        
        // Using toString() to print the output
        
        @Override
        public String toString() {
                
                if(this.getSalary()> 0) { // checking if salary is greater than zero or not
                        
                        if(this.getMobileNumber().startsWith("05") && this.getMobileNumber().length() == 10) { // checking if mobile number starts with 05 and has 10 digit
                                return "Employee Name : "+this.getFirstName() +" "+this.getLastName()+"\n"+"Mobile Number : "+this.getMobileNumber()
                                +"\n"+"Employee Salary : "+ this.getYearSalary();
                                
                        }else { // Printing the error details to user
                                return "Error : Mobile Number must be of 10 digits and starts with 05 ";
                        }
                        
                }else {// Printing the error details to user
                        return "Error : Salary must be greater than zero";
                }
        }
        // Implementing the getYearSalary method
        public double getYearSalary() {
                if(this.getSalary() > 0) {
                        return this.getSalary()*12;
                }else {
                        
                        return 0.0;
                }
        }
        
        public static void main(String args[]) {
                // Creating the employee object and assigning the value
                Employee e = new Employee("Jhon","Doe","05987645",10);

                // Printing the Employee data
                System.out.println(e.toString());
                
        }

}

Note : There can be many other ways to slove this problem ,this is one of the approach.