EmpManagementSys.java

class Employee {

    private int emp_id[] = { 1001, 1002, 1003, 1004, 1005, 1006, 1007 };
    private String emp_name[] = { "Ashish", "Sushma", "Rahul", "Chahat", "Ranjan", "Suman", "Tanmay" };
    private String joining_date[] = { "01/04/2009", "23/08/2012", "12/11/2008", "29/01/2013", "16/07/2005", "1/1/2000",
            "12/06/2006" };
    private char desig_code[] = { 'e', 'c', 'k', 'r', 'm', 'e', 'c' };
    private String dept[] = { "R&D", "PM", "Acct", "Front Desk", "Engg", "Manufacturing", "PM" };
    private int basic[] = { 20000, 30000, 10000, 12000, 50000, 23000, 29000 };
    private int hra[] = { 8000, 12000, 8000, 6000, 20000, 9000, 12000 };
    private int it[] = { 3000, 9000, 1000, 2000, 20000, 4400, 10000 };
    private int calcDA(int i) {
        char designation = desig_code[i];
        switch(designation) {
            case 'e': return 20000;
            case 'c': return 32000;
            case 'k': return 12000;
            case 'r': return 15000;
            case 'm': return 40000;
        }
        return 0;
    }

    private char getDesigCode(int id) {
        return desig_code[getIndex(id)];
    }

    private int getIndex(int id) {
        int index = -1;
        for(int i=0; i<emp_id.length; i++) {
            if(id == emp_id[i]) {
                index = i;
                break;
            }
        }
        return index;
    }
    public int getSalary(int id) {
        int index = getIndex(id);
        if(index == -1) return -1;
        return (basic[index] + hra[index] - it[index] + calcDA(index));
    }

    public String getName(int id) {
        return emp_name[getIndex(id)];
    }

    public String getDept(int id) {
        return dept[getIndex(id)];
    }

    public boolean empExists(int id) {
        if(getIndex(id) != -1)
            return true;
        else
            return false;
    }

    public String getDesignation(int id) {
        char d = getDesigCode(id);
        switch(d) {
            case 'e': return "Engineer";
            case 'c': return "Consultant";
            case 'k': return "Clerk";
            case 'r': return "Receptionist";
            case 'm': return "Manager";
        }
        return "";
    }
    public static void main(String[] args) {
        if(args.length != 1) {
            System.out.println("Usage: java Employee emp_id");
        }
        else {
            int emp_id = Integer.parseInt(args[0]);
            Employee emp = new Employee();
            if(emp.empExists(emp_id)) {
                System.out.println("Emp No.    Emp Name    Department    Designation    Salary");
                System.out.printf("%7d    ", emp_id);
                System.out.printf("%8s    ", emp.getName(emp_id));
                System.out.printf("%10s    ", emp.getDept(emp_id));
                System.out.printf("%11s    ", emp.getDesignation(emp_id));
                System.out.printf("%6d\n", emp.getSalary(emp_id));
            }
            else {
                System.out.println("There is no employee with empid: " + emp_id);
            }
        }
    }
}
Emp