Employee-Details-using-absract-class

Usage of Try-Catch for NullPointer Exception

Create an abstract employee class for data hiding

abstract class Employee1 {
    String name, designation;
    int age, salary;
    Scanner sc = new Scanner(System.in);

    public Employee1() {
        System.out.println("Enter name:");
        name = sc.next();
        System.out.println("Enter age:");
        age = sc.nextInt();
    }

    public void display() {
        System.out.println("Name: " + name);
        System.out.println("Age: " + age);
        System.out.println("Salary: " + salary);
        System.out.println("Designation: " + designation);
    }

    public abstract void salaryRise();
}

Create CLERK, MANAGER, PROGRAMMER classes extending employee class

final class Clerk1 extends Employee1 {
    public Clerk1() {
        salary = 10000;
        designation = "Clerk";
    }

    public void salaryRise() {
        salary += 1000;
    }
}

final class Programmer1 extends Employee1 {
    public Programmer1() {
        salary = 20000;
        designation = "Programmer";
    }

    public void salaryRise() {
        salary += 2000;
    }
}

final class Manager1 extends Employee1 {
    public Manager1() {
        salary = 25000;
        designation = "Manager";
    }

    public void salaryRise() {
        salary += 2500;
    }
}

Write a Do-While loop Switch inside it for Creation,Display,Salary, rise, Exit

 do {
            System.out.println("1.Create \n2.Display \n3.Salary Rise \n4.Exit");
            ch = sc.nextInt();
            switch (ch) {

write a Do-While loop inside every Switch case for selection of Clerk,Programmer,Manager

case 1:
                    do {
                        System.out.println("1.Clerk \n2.Programmer \n3.Manager \n4.Exit");
                        choice = sc.nextInt();
                        switch (choice)

We have to store data in the employee array created, display is also done by exmployee array only
Creation of detalis

 e[i] = new Programmer1();
                                i++;
                                break;

Display of details

 int j = 0;
                       do {
                           e[j].display();
                           j++;
                       } while (e[j] != null);

Write a try-catch conditions for catching of NullPointer Exception in casse 2,3 for display and salary rise without creation of details.

 try {
                        int j = 0;
                        do {
                            e[j].salaryRise();
                            j++;
                        } while (e[j] != null);
                        System.out.println("Salary rised");
                    } catch (Exception ex) {
                        System.out.println("No records found \n");
                    }
                    break;