Question

entry level java program

Office Supplies Inc, an office supply store, services many customers. As customers’ orders for office supplies are shipped, information is entered into a file. Office Supplies Inc bills their customers once each month. At the end of each month, the CEO requests a report of all customers sorted by their customer id (from lowest to highest). The report includes their bill balance and tax liability. Write a program to produce the outstanding balance report sorted by customer ID number from the data in the text file. Below is a description of the information on the text file:

 The first line in the file contains the number of customers in the file (integer)

 Then, the fields below repeat for each customer:

o Customer ID (integer)

o Customer name (String)

o Email address (String)

o Bill balance (double)

o Tax liability (double or String)

The customers served by the office supply store are of two types: tax-exempt or non-tax- exempt. For a tax-exempt customer, the tax liability field on the file is the reason for the tax exemptions: education, non-profit, government, other (String). For a non-tax-exempt customer, the tax liability field is the percent of tax that the customer will pay (double) based on the state in which the customer’s business resides.

Answer 1

// CUSTOMER CLASS

/*

* Customer class to store customer information which implements Comparable Interface

*/

public class Customer implements Comparable<Customer>{

private int customerID;

private String customerName;

private String email;

private double billBalance;

private String taxLiability;

//Compare to method to compare customer based on customer id

@Override

public int compareTo(Customer otherCustomer) {

return (this.customerID < otherCustomer.customerID ) ? -1: (this.customerID > otherCustomer.customerID) ? 1:0 ;

}

/**

* @return the customerID

*/

public int getCustomerID() {

return customerID;

}

/**

* @param customerID the customerID to set

*/

public void setCustomerID(int customerID) {

this.customerID = customerID;

}

/**

* @return the customerName

*/

public String getCustomerName() {

return customerName;

}

/**

* @param customerName the customerName to set

*/

public void setCustomerName(String customerName) {

this.customerName = customerName;

}

/**

* @return the email

*/

public String getEmail() {

return email;

}

/**

* @param email the email to set

*/

public void setEmail(String email) {

this.email = email;

}

/**

* @return the billBalance

*/

public double getBillBalance() {

return billBalance;

}

/**

* @param billBalance the billBalance to set

*/

public void setBillBalance(double billBalance) {

this.billBalance = billBalance;

}

/**

* @return the taxLiability

*/

public String getTaxLiability() {

return taxLiability;

}

/**

* @param taxLiability the taxLiability to set

*/

public void setTaxLiability(String taxLiability) {

this.taxLiability = taxLiability;

}

}

// GENERATEREPORT CLASS with main method

import java.io.File;

import java.io.FileNotFoundException;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Scanner;

public class GenerateReport {

public static void main(String[] args) throws FileNotFoundException {

Customer customer;

File file = new File("input.txt"); //file containing customers’ orders

Scanner sc = new Scanner(file);

int records = Integer.parseInt(sc.nextLine()); //no of customers

ArrayList<Customer> customerList = new ArrayList<Customer>(records); //List to store customers

String line;

String fields[];

while(sc.hasNextLine()){

line = sc.nextLine();

fields = line.split(" ");

customer = new Customer();

//Setting customer fields from the file

customer.setCustomerID(Integer.parseInt(fields[0]));

customer.setCustomerName(fields[1]);

customer.setEmail(fields[2]);

customer.setBillBalance(Double.parseDouble(fields[3]));

customer.setTaxLiability(fields[4]);

//adding customer to list

customerList.add(customer);

}

sc.close();

//sorting customers based on customer id (implemented in compareTo method in Customer class)

Collections.sort(customerList);

//Printing report to the console

System.out.print(String.format("%-8s %-20s %-20s %-15s %-8s\n","ID", "Customer Name", "Email", "Bill Balance", "Tax Liability"));

for (Customer var : customerList) {

System.out.print(String.format("%-8s %-20s %-20s %-15s %-8s\n", var.getCustomerID(), var.getCustomerName(), var.getEmail(), var.getBillBalance(), var.getTaxLiability()));

}

}

}

// input.txt file for sample input

5
189 Rafique [email protected] 12550.3 10.0
180 Raj [email protected] 12340.3 12.0
111 Bilkish [email protected] 2550.3 20.0
100 Zarina [email protected] 90550.3 40.0
220 Ranjit [email protected] 2011 Education