import javax.swing.*;
import java.io.*;
public class ZeeDatabase
{
public static final int NumEmps = 3; //Global
//Unlike C++, nested classes are allowed in Java. When you compile a nested class, Java
//will compile each nested class in separate files as "ParentClass$NestedChildClass".
public static class Employee
{
public Employee() { }
public void DisplayInfo()
{
System.out.print("\tEmployee ID #:" + ID +
"\n\t\tFirst Name: " + FirstName +
"\n\t\tLast Name: " + LastName +
"\n\t\tSocial Security Number: " + Social +
"\n\t\tPay Rate: " + PayRate + "\n\n");
}
public void setID(int x) { ID = x; }
public void setFirst(String x) { FirstName = x; }
public void setLast(String x) { LastName = x; }
public void setSocial(int x) { Social = x; }
public void setPayRate(double x) { PayRate = x; }
public int getID() { return ID; }
public String getFirst() { return FirstName; }
public String getLast() { return LastName; }
public int getSocial() { return Social; }
public double getPayRate() { return PayRate; }
private int ID = 1;
private String FirstName = "";
private String LastName = "";
private int Social = 0;
private double PayRate = 0.0;
}//close nested Employee class
public static void main(String[] args) throws IOException
{
char choice = '#';
boolean EndIt = false;
while(EndIt == false)
{
System.out.println("\n\n\tEmployee Database Menu");
System.out.print("\n\n\t(A)dd Employees" +
"\n\t(L)ist Employees" +
"\n\t(Q)uit\n\n\t");
choice = CINchar();
switch(choice)
{
case 'a' : AddEmployees(); break;
case 'l' : ListEmployees(); break;
case 'q' : EndIt = true; break;
default : System.out.println("\tThat was an invalid choice."); break;
}//close switch statement
}//close while loop
System.exit(0);
}//close main() function
public static void AddEmployees() throws IOException
{
try
{
DataOutputStream outtie;
outtie = new DataOutputStream(new FileOutputStream("EmployeeData.txt"));
Employee EMP = new Employee();
for(int x = 0; x < NumEmps; x++)
{
System.out.println("\nEntry " + (x+1) + " of " + NumEmps + "\n");
System.out.print("\nEnter employee's ID: ");
EMP.setID(CINInteger());
System.out.print("\nEnter employee's first name: ");
EMP.setFirst(CINString());
System.out.print("\nEnter employee's last name: ");
EMP.setLast(CINString());
System.out.print("\nEnter employee's social security number: ");
EMP.setSocial(CINInteger());
System.out.print("\nEnter employee's pay rate: ");
EMP.setPayRate(CINDouble());
outtie.writeInt(EMP.getID());
outtie.writeUTF(EMP.getFirst());
outtie.writeUTF(EMP.getLast());
outtie.writeInt(EMP.getSocial());
outtie.writeDouble(EMP.getPayRate());
}//close for loop
outtie.close();
}//close try
catch (IOException e) { System.err.print("Unable to open file."); }
}//close AddEmployees() function
public static void ListEmployees() throws IOException
{
try
{
DataInputStream innie;
innie = new DataInputStream(new FileInputStream("EmployeeData.txt"));
Employee EMP = new Employee();
//In Java, there is no ".eof()" function. Instead, read() returns -1 at EOF.
for(int x = 0; x < NumEmps; x++)
{
System.out.print("\nEntry " + (x+1) + " of " + NumEmps + ":");
EMP.setID(innie.readInt());
EMP.setFirst(innie.readUTF());
EMP.setLast(innie.readUTF());
EMP.setSocial(innie.readInt());
EMP.setPayRate(innie.readDouble());
EMP.DisplayInfo();
}//close for
innie.close();
}//close try
catch (IOException e) { System.err.print("\tUnable to open file."); }
}//close AddEmployees() function
//-----------------------------------------------------------------------------------------
public static char
CINchar()
{
LineNumberReader cin = new
LineNumberReader(new
InputStreamReader(System.in));
String choice = "";
char WhatToLookFor = '#';
try { choice = cin.readLine();
}
catch (IOException e) {
System.err.println("\tError."); }
choice.toLowerCase();
//In case it's empty
if(choice.equals("")) {
WhatToLookFor = '#'; }
else { WhatToLookFor =
choice.charAt(0); }
return WhatToLookFor;
}
public static
double CINDouble()
{
LineNumberReader cin = new
LineNumberReader(new
InputStreamReader(System.in));
String choice = "";
double WhatToLookFor = 0.0;
try { choice = cin.readLine(); }
catch (IOException e) {
System.err.println("\tError."); }
choice.toLowerCase();
if(choice.equals("")) {
WhatToLookFor = 0.0; }
else
{
//We need to
handle the error if they don't enter a number
try { WhatToLookFor =
Double.parseDouble(choice); }
catch(NumberFormatException e)
{
System.out.println("\tThat was not a number!");
WhatToLookFor = 0.0;
}
}
return WhatToLookFor;
}
//-----------------------------------------------------------------------------------------
public static int CINInteger()
{
LineNumberReader cin = new
LineNumberReader(new
InputStreamReader(System.in));
String choice = "";
int WhatToLookFor = 0;
try { choice = cin.readLine();
}
catch (IOException e) {
System.err.println("\tError."); }
choice.toLowerCase();
if(choice.equals("")) {
WhatToLookFor = 0; }
else
{
//We
need to handle the error if they don't enter a number
try { WhatToLookFor =
Integer.parseInt(choice); }
catch(NumberFormatException
e)
{
System.out.println("\tThat was not a number!");
WhatToLookFor = 0;
}
}
return WhatToLookFor;
}
public static String
CINString()
{
LineNumberReader cin = new
LineNumberReader(new
InputStreamReader(System.in));
String choice = "";
try { choice = cin.readLine();
}
catch (IOException e) {
System.err.println("\tError."); }
return choice;
}
}//close ZeeDatabase class
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