I am new to Java, and I have been trying to get an assignment coded and keep gettin java.lang.NullPointerException in Main Class.java:39. Ok, no prob. Unfortunately I can't quite get this fixed. Any suggestions? I'm using Eclipse Juno. Also, any suggestions on any books, sites, etc that review java in layman's terms would be greatly appreciated.
Main
import javax.swing.JOptionPane;
public class Main_Class {
public static void main(String[] args) {
//declare variables and make objects
String inputVal;
Employee newEmployee1 = new Employee();
Benefit benefit1 = new Benefit("Cigna", 25000, 10);
Salaried salary1 = new Salaried(1);
//Introduction message
System.out.println("Welcome to the Employee Lab");
System.out.println("CIS247, Week 5 Lab");
System.out.println("Name: Phil Sutton");
System.out.println("This program makes instances of the Employee class and outputs the data");
//gather input of employee one and display
displayDivider("Employee Information");
inputVal = getInput("first name");
newEmployee1.setFirstName(inputVal);
inputVal = getInput("last name");
newEmployee1.setLastName(inputVal);
inputVal = getInput("gender - Male (M), Female (F)");
char g = inputVal.charAt(0);
newEmployee1.setGender(g);
inputVal = getInput("dependents");
newEmployee1.setDependents(inputVal);
inputVal = getInput("annual income");
newEmployee1.setAnnualSalary(inputVal);
inputVal = getInput("health insurance");
newEmployee1.benefit.setHealthInsurance(inputVal);
inputVal = getInput("life insurance");
newEmployee1.benefit.setLifeInsurance(Double.parseDouble(inputVal));
inputVal = getInput("vacation days");
newEmployee1.benefit.setVacation(Integer.parseInt(inputVal));
inputVal = getInput("management level");
newEmployee1.salary.setManagementLevel(Integer.parseInt(inputVal));
System.out.println(newEmployee1.toString());
System.out.println("Number of employees: " + Employee.getNumEmployees());
//display info for employee two
Salaried newEmployee = new Salaried("Maria", "Noia", 'F', 5, 24000, benefit1, salary1, g);
displayDivider("Employee Information");
System.out.println(newEmployee.toString());
System.out.println("Number of employees: " + Employee.getNumEmployees());
//display info for employee three
}
//method for the dividers
public static void displayDivider(String outputTitle)
{
System.out.println("*************"+outputTitle+"***************");
}
//gathering input from user
public static String getInput(String inputType)
{
String strInput;
strInput = JOptionPane.showInputDialog("Enter " + inputType + ": ");
return strInput;
}
}
Employee
import java.text.NumberFormat;
public class Employee{
protected String firstName;
protected String lastName;
protected char gender;
protected int dependents;
protected double annualSalary;
private static int numberOfEmployees = 0;
protected Benefit benefit;
protected Salaried salary;
NumberFormat nf = NumberFormat.getCurrencyInstance();
//default constructor
public Employee() {
firstName = null;
lastName = null;
gender = 'u';
dependents = 0;
annualSalary = 0;
benefit = new Benefit(firstName, dependents, dependents);
numberOfEmployees++;
}
//constructor
public Employee(String firstName, String lastName, char gender, int dependents, double annualSalary, Benefit benefit1, Salaried salary1) {
this.firstName = firstName;
this.lastName = lastName;
this.gender = gender;
this.dependents = dependents;
this.annualSalary = annualSalary;
this.benefit = benefit1;
numberOfEmployees++;
}
//display the employee information when invoked
public String toString(){
String s;
s = "First Name: " + firstName + "\n";
s += "Last Name: " + lastName + "\n";
s += "Gender: " + gender + "\n";
s += "Dependents: " + dependents + "\n";
s += "Annual Salary: " + nf.format(annualSalary) + "\n";
s += "Weekly Income: " + nf.format(calculatePay()) + "\n";
s += benefit.toString();
s += salary.toString();
return s;
}
//First Name
public String getFirstName(){
return firstName;
}
public void setFirstName(String firstName){
this.firstName = firstName;
}
//Last Name
public String getLastName(){
return lastName;
}
public void setLastName(String lastName){
this.lastName = lastName;
}
//Gender
public char getGender(){
return gender;
}
public void setGender(char gender){
this.gender = gender;
}
//Dependents
public int getDependets(){
return dependents;
}
public void setDependents(int dependents){
this.dependents = dependents;
}
//overloaded Dependents
public void setDependents(String sDepend){
int depend = Integer.parseInt(sDepend);
this.dependents = depend;
}
//Annual Salary
public double getAnnualSalary(){
return annualSalary;
}
public void setAnnualSalary(double annualSalary){
this.annualSalary = annualSalary;
}
//overloaded Annual Salary that accepts a string
public void setAnnualSalary(String sSalary){
double salary = Double.parseDouble(sSalary);
this.annualSalary = salary;
}
//Calculate the weekly income
public double calculatePay(){
double weeklyPay = annualSalary / 52;
return weeklyPay;
}
public static int getNumEmployees(){
return numberOfEmployees;
}
}
Salaried
import javax.swing.JOptionPane;
public class Salaried extends Employee {
//declare variables
private static final int MIN_MANAGEMENT = 0;
private static final int MAX_MANAGEMENT = 3;
private static final double BONUS_PERCENT = 0.1;
private int managementLevel;
String inputVal;
//Constructors
public Salaried() {
super();
managementLevel = 0;
}
public Salaried(int managementLevel){
super();
this.managementLevel = managementLevel;
}
public Salaried(String firstName, String lastName, char gender,int dependents, double annualSalary, Benefit benefit1, Salaried salary1, int managementLevel) {
super(firstName, lastName, gender, dependents, annualSalary, benefit1, salary1);
this.managementLevel = managementLevel;
}
public void setManagementLevel(int managementLevel){
if (managementLevel >= MIN_MANAGEMENT && managementLevel <= MAX_MANAGEMENT) {
this.managementLevel = managementLevel;
}
else {
this.managementLevel = 0;
}
}
public double getManagementLevel(){
return managementLevel;
}
@Override
public String toString(){
String s = super.toString();
s += "Management level: " + managementLevel + "\n";
return s;
}
//calculate managerial bonus
public double calculatePay(){
double bonusPercent = getAnnualSalary() * (getManagementLevel() * BONUS_PERCENT);
return bonusPercent;
}
public static String getInput(String inputType)
{
String strInput;
strInput = JOptionPane.showInputDialog("Enter " + inputType + ": ");
return strInput;
}
}
Benefit
public class Benefit {
public Benefit(String string, int i, int j) {
// TODO Auto-generated constructor stub
}
public void setHealthInsurance(String inputVal) {
// TODO Auto-generated method stub
}
public void setLifeInsurance(double parseDouble) {
// TODO Auto-generated method stub
}
public void setVacation(int parseInt) {
// TODO Auto-generated method stub
}
}
