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Explanation of Solution
Program:
File name: “SalespersonDatabase.java”
//Import necessary header files
import java.util.*;
//Define a class named SalespersonDatabase
public class SalespersonDatabase
{
//Define main method
public static void main(String[] args)
{
//Create an array of objects
SalesPerson[] salespeople = new SalesPerson[20];
//Declare variables
int x;
int id;
int count = 0;
double sales;
final int QUIT = 999;
char option;
String message = "";
//Create an object for Scanner class
Scanner keyboard = new Scanner(System.in);
//Prompt the user to enter an option
System.out.print("Do you want to (A)dd, (D)elete, or (C)hange a record or (Q)uit >> ");
option = keyboard.nextLine().charAt(0);
//While condition exists if option entered by the user is not equal to Quit
while(option != 'Q')
{
//If option is to Add a record
if(option == 'A')
count = addOption(salespeople, count);
//If option is to Delete a record
else
if(option == 'D')
count = deleteOption(salespeople, count);
//If option is to Change a record
else
if(option == 'C')
changeOption(salespeople, count);
//Invalid
else
//Print the result
System.out.println("Invalid entry");
//Prompt the user to enter an option
System.out.print("Do you want to (A)dd, (D)elete, or (C)hange a record or (Q)uit >> ");
option = keyboard.nextLine().charAt(0);
}
}
//Define a method for add option
public static int addOption(SalesPerson[] array, int count)
{
//Create an object for Scanner class
Scanner keyboard = new Scanner(System.in);
//Declare variables
int id;
double sales;
boolean alreadyEntered;
//Check if
if(count == array.length)
//Print the result
System.out.println("Sorry - array is full -- cannot add a record");
//if database is not full
else
{
//Prompt the user to enter the ID of the salesperson
System.out.print("Enter salesperson ID >> ");
id = keyboard.nextInt();
alreadyEntered = false;
for(int x = 0; x < count; ++x)
//Check if ID number already exists
if(array[x].getId() == id)
{
//Print the result
System.out.println("Sorry -- ID number already exists");
alreadyEntered = true;
}
//Check if ID number does not exists
if(!alreadyEntered)
{
//Prompt the user to enter the sales
System.out.print("Enter sales >> ");
sales = keyboard.nextDouble();
array[count] = new SalesPerson(id, sales);
//Increment the count
++count;
}
}
//Display the database values
display(array, count);
keyboard.nextLine();
//Return the value
return count;
}
//Define a method for delete option
public static int deleteOption(SalesPerson[] array, int count)
{
//Create an object for Scanner class
Scanner keyboard = new Scanner(System.in);
//Declare variables
int id;
int position = 0;
//Check if database is empty
if(count == 0)
//Print the result
System.out.println("Cannot delete - no records in database");
//if database is not empty
else
{
//Prompt the user to enter the ID of the salesperson
System.out.print("Enter ID to delete >> ");
id = keyboard.nextInt();
boolean exists = false;
for(int x = 0; x < count; ++x)
//Check if ID number already exists
if(array[x].getId() == id)
{
exists = true;
position = x;
}
//if ID number does not exists
if(!exists)
//Print the result
System...
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