Develop Reference

Objects in the array list are also similar after being loaded. Why?

My program is a simple chatroom. the values ​​written from the user by the text field in the registration section and creates an account. I have a class called "Account" that takes the same values ​​in the input and it contains the same fields. All accounts need to be saved and loaded for later implementation.
I used the code below (this is part of the program code) but there is a problem. I printed the values ​​after loading and found that it was reporting null values. Then after adding a new account to the array list all the values ​​in the list were changed to the added value. For example, I create and save an account with name "a" and email "a", then run the program again.
Adding the account with name and email "B" here prints two accounts B. what is the problem?
String email= t4.getText();
String password=t5.getText();
String name=t1.getText();
String family=t2.getText();
String phoneNumber=t3.getText();
try {
FileInputStream f = new FileInputStream("accounts.txt");
ObjectInputStream obj = new ObjectInputStream(f);
int size=obj.readInt();
for (int i = 0; i <size ; i++) {
accounts.add((Account)obj.readObject());
}
} catch (Exception e){
e.printStackTrace();
}
for (int i = 0; i <accounts.size() ; i++) {
System.out.println(accounts.get(i).name+" "+accounts.get(i).email);
}
Account account = new Account(name,family,phoneNumber,email,password);
accounts.add(account);
try{
FileOutputStream f=new FileOutputStream("accounts.txt",false);
ObjectOutputStream obj=new ObjectOutputStream(f);
obj.writeInt(accounts.size());
for (Account a:accounts) {
obj.writeObject(a);
}
} catch (Exception e){
e.printStackTrace();
}
for (int i = 0; i <accounts.size() ; i++) {
System.out.println(accounts.get(i).name+" "+accounts.get(i).email);
}
//class account
class Account implements Serializable {
static String name, family, phoneNumber, email, password;
static ArrayList<Post> posts = new ArrayList();
static ArrayList<Account> following = new ArrayList();
static ArrayList<Account> follower = new ArrayList();
Account(String n, String f, String pn, String e, String ps) {
name = n;
family = f;
phoneNumber = pn;
email = e;
password = ps;
}
void follow(Account user) {
following.add(user);
user.follower.add(this);
}
void post(String data) {
Post post = new Post(data, new Date(), this);
posts.add(post);
for (Account account : follower) {
account.posts.add(post);
}
}
}

All the members of the Account class are static, meaning that they belong to the class instead of a specific instance. Make them non-static and you should be good to go.

Only last row is being inserted in the table in hibernate

I am working on a java project using hibernate. I have a csv file that contains more than 200 data. I've successfully retrieved data from csv file. Now I have to insert those data to the table.
The problem is only the last row is being added to the table. Other rows are not being inserted.
The schema of the table is given below:
INSERT INTO `attendence_table`
(`serial_no` int auto-increment,
`employee_id` varchar2,
`in_time` varchar2,
`out_time` varchar2,
`attend_date` date)
The Attendence class is given below:
#Entity
#Table(name = "attendence_table")
public class Attendence {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "serial_no")
private int id;
#Column(name = "employee_id")
private String employee_id;
#Column(name = "in_time")
private String inTime;
#Column(name = "out_time")
private String outTime;
#Column(name = "attend_date")
private String date;
public String getEmployee_id() {
return employee_id;
}
public void setEmployee_id(String employee_id) {
this.employee_id = employee_id;
}
public String getInTime() {
return inTime;
}
public void setInTime(String inTime) {
this.inTime = inTime;
}
public String getOutTime() {
return outTime;
}
public void setOutTime(String outTime) {
this.outTime = outTime;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
}
The insert function is given below:
private static SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
public static void hibernateInsertAttendenceSession(List<Attendence> collection) {
Session session = sessionFactory.openSession();
session.beginTransaction();
for (Attendence obj : collection) {
session.save(obj);
System.out.println("Object Added");
}
session.getTransaction().commit();
session.close();
}
For your convenience, I'm also adding the glimpse of the csv file:
Test_company,TestId001,Test Name,2018/03/22,08:53:15,17:50:40
Test_company,TestId001,Test Name,2018/03/25,08:51:02,17:55:18
Test_company,TestId001,Test Name,2018/03/27,08:50:16,18:03:47
Test_company,TestId001,Test Name,2018/03/28,08:48:07,18:46:42
Test_company,TestId001,Test Name,2018/03/29,08:56:16,20:14:16
Thanks in advance for giving your valuable time to help me with this issue.

You are saving the reference of the Attendence object, while you're modifying it's content everytime.
You should probably instantiate an Attendence Object every time you attempt saving it.
for (Attendence obj : collection) {
Attendence newRef = new Attendence(obj);
session.save(newRef);
System.out.println("Object Added");
}

Sorry, My issue was in different place. Thank you all for your help. While retrieving data from csv file, there was a little error which created the issue. Thank you all for your time :)
In the readfromcsv function, previously I did the following:
public static void readFromExcel(String path) {
ArrayList<Attendence> attendences = new ArrayList<Attendence>();
String csvFile = path;
BufferedReader br = null;
String line = "";
String cvsSplitBy = ",";
Attendence attendenceLine=new Attendence();
try {
br = new BufferedReader(new FileReader(csvFile));
//Attendence attendenceLine = new Attendence();
line = br.readLine();
while ((line = br.readLine()) != null) {
String[] data = line.split(cvsSplitBy);
if (data.length == 6) {
attendenceLine.setEmployee_id(data[1]);
attendenceLine.setDate(data[3]);
attendenceLine.setInTime(data[4]);
attendenceLine.setOutTime(data[5]);
}
else{
attendenceLine.setEmployee_id(data[1]);
attendenceLine.setDate(data[3]);
attendenceLine.setInTime("no punch");
attendenceLine.setOutTime("no punch");
}
attendences.add(attendenceLine);
}
for(Attendence attendence: attendences){
HibernateOperation.hibernateInsertOneAttendenceSession(attendence);
}
//HibernateOperation.hibernateInsertAttendenceSession(attendences);
} catch (FileNotFoundException ex) {
Logger.getLogger(AddToDatabaseOperation.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(AddToDatabaseOperation.class.getName()).log(Level.SEVERE, null, ex);
}
}
Here the attendenceLine String Variable was only having the last row as a reference value. Thats why for every iteration, I need to create the object again. I did the following to solve the issue.
public static void readFromExcel(String path) {
ArrayList<Attendence> attendences = new ArrayList<Attendence>();
String csvFile = path;
BufferedReader br = null;
String line = "";
String cvsSplitBy = ",";
try {
br = new BufferedReader(new FileReader(csvFile));
//Attendence attendenceLine = new Attendence();
line = br.readLine();
while ((line = br.readLine()) != null) {
String[] data = line.split(cvsSplitBy);
Attendence attendenceLine=new Attendence();
if (data.length == 6) {
attendenceLine.setEmployee_id(data[1]);
attendenceLine.setDate(data[3]);
attendenceLine.setInTime(data[4]);
attendenceLine.setOutTime(data[5]);
}
else{
attendenceLine.setEmployee_id(data[1]);
attendenceLine.setDate(data[3]);
attendenceLine.setInTime("no punch");
attendenceLine.setOutTime("no punch");
}
attendences.add(attendenceLine);
}
for(Attendence attendence: attendences){
HibernateOperation.hibernateInsertOneAttendenceSession(attendence);
}
//HibernateOperation.hibernateInsertAttendenceSession(attendences);
} catch (FileNotFoundException ex) {
Logger.getLogger(AddToDatabaseOperation.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(AddToDatabaseOperation.class.getName()).log(Level.SEVERE, null, ex);
}
}

Please call new class and add all filed to this new class and save new class.
It will work.
for (Attendence obj : collection) {
Attendence newRef = new Attendence();
newRef.setSerialNo(obj.getSerialNo())
// set newRef to obj of all column......
session.save(newRef);
System.out.println("Object Added");
}

Storing Objects of an array into CSV file and reading them with specific arguments for GUI

As a part of my assignment I had to store objects of an array in a flat-file and retrieve them when certain criteria was met. I can save the objects fine but when retrieving them I have an issue with getting more than one value, I understand what is going wrong but I am struggling to find a solution. Here is the concept of whats happening.
Button no 10,A (R1S10 in the code)is my testing button, When I click it it creates an event that I will show below.
Click event for button 10A -
private void R1S10ActionPerformed(java.awt.event.ActionEvent evt) {
seats.add(seat1);
if (R1S10.getBackground().equals(Color.red) &&(IsSeatBooked().equals("true"))){
Component frame = null;
JOptionPane.showMessageDialog(frame, "Seat UnBooked");
seat1.setBooked("false");
seat1.setName("");
R1S10.setBackground(Color.yellow);
try {
reader();
writer();
//String booked = "true";
//Pass String booked into csv file
} catch (IOException ex) {
Logger.getLogger(SeatingPlan.class.getName()).log(Level.SEVERE, null, ex);
}
}
else{
Component frame = null;
String name = JOptionPane.showInputDialog(frame, "Please enter name of Customer booking");
if (name.isEmpty()) {
JOptionPane.showMessageDialog(frame, "No value entered");
} else if (name != null) {
seat1.setName(name);
seat1.setBooked("true");
R1S10.setBackground(Color.red);
JOptionPane.showMessageDialog(frame, "Your Booking has been placed");
try {
writer();
reader();
//String booked = "true";
//Pass String booked into csv file
} catch (IOException ex) {
Logger.getLogger(SeatingPlan.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
Followed by the screen below -
Outcome -
And when the button is pressed again -
I am using three methods in this SeatingPlan.java - writer(),reader() and IsSeatBooked().
SeatingPlan -
public class SeatingPlan extends javax.swing.JFrame {
/**
* Creates new form SeatingPlan
*/
String seatNo, name, bookedSeat;
FileWriter fileWriter = null;
List<Seat> seats = new ArrayList<Seat>();
//Seat Object Declaration
Seat seat1 = new Seat("R1S10","","false");
Seat seat2 = new Seat("R1S9", "", "false");
String fileName = "seat.csv";
writer -
public void writer() throws IOException {
//Delimiter used in CSV file
final String NEW_LINE_SEPARATOR = "\n", COMMA_DELIMITER = ",";
//CSV file header
final String FILE_HEADER = "seatID,name,booked";
//fileName = System.getProperty("user.home") + "/seat.csv";
try {
fileWriter = new FileWriter(fileName);
//Write the CSV file header
fileWriter.append(FILE_HEADER.toString());
//Add a new line separator after the header
fileWriter.append(NEW_LINE_SEPARATOR);
//Write a new student object list to the CSV file
for (Seat seat : seats) {
fileWriter.append(String.valueOf(seat.getSeatID()));
fileWriter.append(COMMA_DELIMITER);
fileWriter.append(seat.getName());
fileWriter.append(COMMA_DELIMITER);
fileWriter.append(seat.isBooked());
fileWriter.append(NEW_LINE_SEPARATOR);
}
System.out.println("CSV file was created successfully !!!");
} catch (Exception e) {
System.out.println("Error in CsvFileWriter !!!");
e.printStackTrace();
} finally {
fileWriter.flush();
fileWriter.close();
}
}
reader -
public void reader() {
//Delimiter used in CSV file
final String COMMA_DELIMITER = ",";
//Student attributes index
final int SEAT_ID_IDX = 0;
final int SEAT_NAME_IDX = 1;
final int SEAT_BOOKED = 2;
//private static final int STUDENT_LNAME_IDX = 2;
BufferedReader fileReader = null;
try {
//Create a new list of student to be filled by CSV file data
List<Seat> seats = new ArrayList<>();
String line = "";
//Create the file reader
fileReader = new BufferedReader(new FileReader(fileName));
//Read the CSV file header to skip it
fileReader.readLine();
//Read the file line by line starting from the second line
while ((line = fileReader.readLine()) != null) {
//Get all tokens available in line
String[] tokens = line.split(COMMA_DELIMITER);
if (tokens.length > 0) {
//Create a new seat object and fill his data
Seat seat = new Seat(tokens[SEAT_ID_IDX],
tokens[SEAT_NAME_IDX], tokens[SEAT_BOOKED]);
seats.add(seat);
seatNo = tokens[SEAT_ID_IDX];
//System.out.println("Seat Number: " + seatNo);
bookedSeat = tokens[SEAT_BOOKED];
}
}
//Print the new student list
for (Seat seat : seats) {
System.out.println(seat.toString());
}
} catch (Exception e) {
System.out.println("Error in CsvFileReader !!!");
e.printStackTrace();
} finally {
try {
fileReader.close();
} catch (IOException e) {
System.out.println("Error while closing fileReader !!!");
e.printStackTrace();
}
}
}//end reader
SeatingPlan - This if where I have tried to have the arguments controlling the outcome but IsBooked is colliding when multiple seats are selected.
public SeatingPlan() throws IOException {
setVisible(true);
initComponents();
//reader();
ColourSectionGold();
ColourSectionBronze();
reader();
if(R1S10.getBackground().equals(Color.yellow) && (IsSeatBooked().equals("true"))){ R1S10.setBackground(Color.red);}
//if(R1S9.getBackground().equals(Color.yellow) && (IsSeatBooked().equals("true2"))){ R1S9.setBackground(Color.red);}
}
IsSeatBooked -
public String IsSeatBooked(){
return bookedSeat;
}//end IsSeatBooked
Im using the method above as my argument to see whether a seat is booked or not, but when a new seat is click it sets the whole value of 'bookedSeat' - which leaves the system not working correctly. I understand the code is not very efficient but is there any temporary fix for this problem, if I have explained it correctly.
Also I will include my class for Seat -
public class Seat {
private String seatID;
private String booked;
private String name;
private int price;
public Seat(String seatID,String name,String booked){
this.seatID = seatID;
this.booked = "";
this.name = name;
this.price = price;
}
public String getSeatID() {
return seatID;
}
public void setSeatID(String seatID) {
this.seatID = seatID;
}
public String isBooked() {
return booked;
}
public void setBooked(String booked) {
this.booked = booked;
}
public String getStatus(){
return booked;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void setPrice() {
this.price = price;
}}//end class Seat
And a look at the CSV file that is created -
I wish to be able to click more than one button and save its state, Button 10 works fine at the moment, but as IsBooked only has one value at a time it clashes.
If you took the time to check this out, I appreciate it. Any constructive criticism is helpful and any ideas would be great!
Thanks,
Paddy.

Too much code to look at to see exactly what you are doing.
Instead of using your csv file, you could create a Properties file. The Propertiesfile will store the data in the form of:
key:data
So in your case the key would be the id: A1, A2... and the data would be the name of the person who booked the seat.
So the file would start out as empty. When you create the GUI you would create a loop that checks each id to see if an entry is found in the Properties field. If it is found then you display the seat as taken, otherwise it is empty.
Then whenever you want to book a seat you just use the setProperty(...) method.
The Properties class has load(...) and store(...) methods.
So the Properties class allows you to easily manage a flat file database with minimal effort.
Note, you would never have variable names like R1S10. That would requirement 100 different variables with if/else statements. Instead you would extend JButton and pass in the row and seat as parameters the button. Then in the ActionListener for the button you can access the row/seat information to built the ID used as the key for the properties file.
Edit:
Couldn't quite make the loop that checks if the ID is in the properties file.
If the property is null, the seath is empty.
import java.util.*;
public class Main
{
public static void main(String[] args)
{
Properties properties = new Properties();
properties.setProperty("A2", "Smith");
properties.setProperty("C3", "Jones");
String[] rows = { "A", "B", "C", "D" };
int seats = 4;
for (int row = 0; row < rows.length; row++)
{
for (int seat = 1; seat <= seats; seat++)
{
String key = rows[row] + seat;
String property = properties.getProperty( key );
System.out.println(key + " : " + property);
}
}
}
}

Insert record to database from a server/client GUI java

Hi i am struggling to get my database to receive a username and ip address from a client instance connecting to a server.
It is a bidding system that initially just lets multiple individual instances of the client bid on 2 items, now I need to add the name (user prompted to enter upon loading client instance) and their ip address to my database.
public static void main(String[] args) throws IOException {
ServerSocket serverSocket = null; //null pointer exception fix
Statement statement = null;
String inserSql = null;
Connection sqlLink = null;
final int PORT = 1239;
Socket client = null;
ClientHandler handler = null;
Scanner getTime;
try {
/**
* This piece of code has errors or you maybe did the error
* when copy/paste your code.
* Fixed the DriverManager connection code
*/
sqlLink = DriverManager.getConnection(
"correct info already here);
} catch (SQLException e) {
System.out.println("* Cannot connect to database! *");
System.exit(1);
}
try {
serverSocket = new ServerSocket(PORT);
} catch (IOException ioEx) {
System.out.println("Unable to set up port!");
System.exit(1);
}
System.out.println("\nUp and running\n");
String currentTime = null;
getTime = new Scanner(System.in);
System.out.println("\nSet time for Ball");
currentTime = getTime.nextLine();
Items BallItem = new Items("Ball", currentTime, "Ball");
System.out.println("\nSet time for Plate");
currentTime = getTime.nextLine();
Items PlateItem = new Items("Plate", currentTime, "Plate");
Bidder bidder = new Bidder(null);
BallItem.start();
PlateItem.start();
Users user = new Users(BallItem, PlateItem);
ArrayList<ClientHandler> userList =
new ArrayList<ClientHandler>();
//add new array for the clients details as stated
ArrayList<String> bidders = new ArrayList<String>();
do {
client = serverSocket.accept();//
System.out.println("Enter username ");//
//takes in bidders name (1.1 and 2.1)
bidders.add(getTime.nextLine());
bidders.add(client.getInetAddress().toString());
//takes in next bidder's ip address to string like in tips (2.2)
Bidder userBidding = new Bidder(bidders);
System.out.println("\nUser" + (user.getUsers() + 1));
user.addUsers(userList, client, handler);
System.out.println(userBidding.returnUsers());
bidder.insert(statement, statement);
}
while (true);
}
}
class Items extends Thread {
private String name, description, timeUp, userBidding = "";
private boolean newBid = true;
private double topBid = 0;
private Calendar start = Calendar.getInstance();
private int date = start.get(Calendar.DATE); //gets the dates
private int month = start.get(Calendar.MONTH);
private int year = start.get(Calendar.YEAR);
private Calendar deadline = Calendar.getInstance();
//time file supplied to help etc
private Calendar now = Calendar.getInstance();
public Items(String newName, String newTimeString,
String newDescription) throws IOException {
String timeString, hourString, minString;
name = newName;
description = newDescription;
timeUp = newTimeString;
timeString = newTimeString;
hourString = timeString.substring(0, 2);
int hour = Integer.parseInt(hourString);
minString = timeString.substring(3, 5);
int minute = Integer.parseInt(minString);
deadline.set(year, month, date, hour, minute, 0); //setting time
}
public void run() {
while (now.before(deadline)) {
System.out.println(name + " " + getDateTime(now));
try {
Thread.sleep(5000); //increased to check server notifications easier
} catch (InterruptedException intEx) {
}
now = Calendar.getInstance();
}
System.out.println("\nDeadline! Times up!");
newBid = false;
}
class Bidder {
private static ArrayList<String> users;
private static Users user = new Users(null, null);
public Bidder(ArrayList<String> newUserList) {
users = newUserList;
}
public ArrayList<String> returnUsers()//return users as in question
{
return users;
}
public static String returnIP()//return ip as in question
{
return users.get(user.getUsers() + 1);
}
static void insert(Statement insert, Statement statement) {
Users user = new Users(null, null);
try {
String insertSql = "INSERT INTO Usernames(id, Name, ipAddress) VALUES (1"
+ users.get(user.getUsers()) + "," + returnIP() + ")";
System.out.println(users.get(user.getUsers()));
statement.executeUpdate(insertSql);
} catch (SQLException sqlEx) {
System.out.println("* Cannot execute insert! *");
sqlEx.printStackTrace();
System.exit(1);
}
}
//remove user as stated in question
public synchronized void RemoveUser(Socket client, int clientUser) {
int index = 0;
for (final String newString : users) {
if (users.indexOf(user.getUsers()) == clientUser) {
try {
client.close();
Thread.currentThread().isInterrupted();
users.remove(index);
} catch (final IOException e) {
System.out.println("Try to leave again!");
System.exit(1);
}
}
index++;
}
}
}
class Users {
private ArrayList<ClientHandler> userList;
private Items Ball;
private Items Plate;
public Users(Items newItem1, Items newItem2) {
Ball = newItem1;
Plate = newItem2;
userList = null;
}
public synchronized int getUsers() {
int totalUsers = 0;
if (userList != null)
for (ClientHandler handler : userList)
totalUsers++;
return totalUsers;
}
}// <-- miss this close brace

Reading multiple line textfile to database

I have a text file that looks like this:
Person1 Name
Person1 age
Person1 Address
Person2 Name
Person2 age
Person2 Address
Person3 Name
Person2 age
Person3 Address
and I need to get the information to a database.
I have the database connection and know how to enter the info into the database once I have the lines put into the correct variables . . . but how do I get java to identify each new line and set the info to a variable.
Basically I need to take the textfile info and add to the following variables
$Name
$Age
$Address
I thought of using an Array but since I'm mixing strings and numbers, I can't use a String array.
Since I'm using Line per line there is no delimiter.
** Updated info **
I used name, age and address as example variables, and got some of the answers kind of working but I still can't get it completely working, so I should post the whole code . . .
I'm open to code cleanup as well (I'm really new to Java)
The answers given I kind of got to work, except the reader is separating the variables by spaces and in a situation like name and address both have spaces in them, the space delimiter isn't giving me the results I need.
Here is the textfile contents:
Ray Wade
200
American Foundation for Children with AIDS
Tom Hardy
125.50
American Red Cross
As you can see I call the LoadTextFile(); within the CreateTables() function
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.sql.*;
import javax.sql.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
public class Charity extends JFrame
{
JButton btnCalc = new JButton("Donate"), btnLoad = new JButton("Load File"), btnExit = new JButton("Exit");
JLabel name, amount, intro = new JLabel("Would You Like to Donate to a Charity Today? It Only Takes a Few Moments"), message1 = new JLabel(""), message2 = new JLabel("");
JTextField textName, textAmount;
// Create String Array to list charities in the combobox
String[] charities = { "Choose a Charity or Enter a New Charity",
"American Foundation for Children with AIDS",
"American Red Cross",
"Breast Cancer Research Foundation",
"Livestrong *Formerly Lance Armstrong Foundation*",
"Michael J. Fox Foundation for Parkinson's Research" };
JComboBox charityList = new JComboBox(charities);
String file ="Charity.txt";
// Variables used later
double dAmount;
String Charity = null;
int debug = 0; // change to 1 to turn debug mode on
// Variables initialized for Database Stuff
Object[][] databaseInfo;
Object[] columns = {"name", "charity", "amount"};
Connection conn = null;
ResultSet rows;
String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/";
String DBname = "charity";
String DBusername = "root";
String DBpass = "password";
// Variables and Class for TableModel
DefaultTableModel dTableModel = new DefaultTableModel(databaseInfo, columns){
public Class getColumnClass(int column) {
Class returnValue;
// Verifying that the column exists (index > 0 && index < number of columns
if ((column >= 0) && (column < getColumnCount())) {
returnValue = getValueAt(0, column).getClass();
} else {
// Returns the class for the item in the column
returnValue = Object.class;
}
return returnValue;
}
};
/**
Sets the title, size and layout of the JFrame.<!-- -->Also calls the methods to setup the panels.
*/
public Charity()
{
super("Donations to Charities"); // Title of frame
setLayout(new FlowLayout()); // Declare layout of frame
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Default close
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize(); // Get screen size
this.setResizable( false ); // turn off frame resize
this.setSize(600, dim.height-100); // set size of frame
CreatePanels();
GetAction(); // Call ActionListeners
CreateDatabase();
}
public void CreatePanels()
{
SetupCharityGroup(); // Call method to setup charity list panel
SetupDataPanel(); // Call method to setup data collection panel
SetupDisplayTable();
setVisible(true); // Make frame visible
}
/**
Method to setup the display panel containing a JTable that will show the information read from the database.
*/
private void SetupDisplayTable()
{
JTable table = new JTable(dTableModel); // Create a JTable using the custom DefaultTableModel
table.setFont(new Font("Serif", Font.PLAIN, 16)); // Increase the font size for the cells in the table
table.setRowHeight(table.getRowHeight()+5); // Increase the size of the cells to allow for bigger fonts
table.setAutoCreateRowSorter(true); // Allows the user to sort the data
// right justify amount column
TableColumn tc = table.getColumn("amount");
RightTableCellRenderer rightRenderer = new RightTableCellRenderer();
tc.setCellRenderer(rightRenderer);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); // Disable auto resizing
// Set the width for the columns
TableColumn col1 = table.getColumnModel().getColumn(0);
col1.setPreferredWidth(200);
TableColumn col2 = table.getColumnModel().getColumn(1);
col2.setPreferredWidth(275);
TableColumn col3 = table.getColumnModel().getColumn(2);
col3.setPreferredWidth(75);
// Put the table in a scrollpane and add scrollpane to the frame
JScrollPane scrollPane = new JScrollPane(table);
scrollPane.setPreferredSize(new Dimension(552, 400));
this.add(scrollPane, BorderLayout.CENTER);
}
/**
Method to setup the data panel containing textFields, Labels, and buttons.
*/
private void SetupDataPanel()
{
JPanel pan = new JPanel();
GridLayout grid = new GridLayout(0, 1, 5, 5);
pan.setLayout(grid);
// Setup TextFields and Labels for name of person donating
// and add them to the panel
name = new JLabel("Name");
textName = new JTextField("", 16);
textName.setHorizontalAlignment(JTextField.RIGHT);
pan.add(name);
pan.add(textName);
// Setup TextFields and Labels for amount being donated
// and add them to the panel
amount = new JLabel("Donation Amount");
textAmount = new JTextField("", 4);
textAmount.setHorizontalAlignment(JTextField.RIGHT);
pan.add(amount);
pan.add(textAmount);
// add buttons and message labels to panel
pan.add(intro);
pan.add(btnCalc);
pan.add(btnLoad);
pan.add(btnExit);
pan.add(message1);
pan.add(message2);
this.add(pan);
}
/**
Method to setup the charity panel with a border containing an editable combobox filled with a list of charities.
*/
private void SetupCharityGroup()
{
JPanel Boxpan=new JPanel();
Boxpan.setBorder(BorderFactory.createTitledBorder(
BorderFactory.createEtchedBorder(), "Charities"));
this.add(Boxpan);
charityList.setEditable(true);
Boxpan.add(charityList);
}
/**
Add ActionHandlers to interactive elements.
*/
private void GetAction()
{
ActionHandler handler = new ActionHandler();
btnLoad.addActionListener(handler);
btnCalc.addActionListener(handler);
btnExit.addActionListener(handler);
charityList.addActionListener( handler );
}
/**
Method to make ActionHandlers into ActionListeners.
*/
private class ActionHandler implements ActionListener
{
public void actionPerformed(ActionEvent evt)
{
String incmd = evt.getActionCommand();
if (incmd.equals("Donate")) // If Donate button is pressed
if (textName.getText().isEmpty())
{
message1.setText("<html><font color='red'>Invalid Donation</font>");
message2.setText("<html><font color='red'>Error: Name of Donor missing!<font>");
} else
CheckDonate();
else if (incmd.equals("Load File")) // If Load File button is pressed
DatabaseLoad();
else if (incmd.equals("Exit")) // If Exit button is pressed
System.exit(0);
}
}
/**
Method to check if charity is selected in the combobox.<!-- -->If a charity is selected, call CharitySelected method, otherwise send error message to Frame.
*/
private void CheckCharity()
{
Object selectedCharity = charityList.getSelectedItem();
if (charityList.getSelectedIndex() == 0) // if charity is not selected
{
message1.setText("<html><font color='red'>Invalid Donation</font>");
message2.setText("<html><font color='red'>Error: No Charity Selected!<font>");
} else CharityIsSelected();
}
/**
If charity is selected, set the selected value to "Charity" variable and call method to thank donator.
*/
private void CharityIsSelected()
{
Object selectedCharity = charityList.getSelectedItem();
Charity = selectedCharity.toString(); // selectedCharity Object converted to String
ThankYou();
}
/**
Thank the donator and call the databseAdd method.
*/
private void ThankYou()
{
message1.setText("Thank You! "+textName.getText());
message2.setText(" $"+textAmount.getText()+" Will be donated to "+Charity);
DatabaseAdd();
}
/**
Method that will check that donation amount is a number in a range between 1 and 1000000000.
*/
private void CheckDonate()
{ try
{
dAmount = Double.parseDouble(textAmount.getText());
if(dAmount <= 0.0 || dAmount > 1000000000 )
{
message1.setText("<html><font color='red'>Invalid Donation</font>");
message2.setText("<html><font color='red'>Amount invalid</font>");
} else CheckCharity();
} catch (NumberFormatException ex) {
// Executes if the data entered is not a number
if (debug == 1)
{
message1.setText("Error: "+ex.getMessage());
message2.setText("");
} else
{
message1.setText("<html><font color='red'>Invalid Donation</font>");
message2.setText("<html><font color='red'>Amount Not Recognized</font>");
}
}
}
public void DBConnection()
{ try
{
// The driver allows you to query the database with Java
// forName dynamically loads the class for you
Class.forName(driver);
// DriverManager is used to handle a set of JDBC drivers
// getConnection establishes a connection to the database
// You must also pass the userid and password for the database
conn = DriverManager.getConnection (url, DBusername, DBpass);
} catch (SQLException ex) {
// debug:
if (debug == 1)
{
message1.setText("Error: "+ex.getMessage());
message2.setText("Error: "+ex.getErrorCode());
} else
message1.setText("Database Error: contact admin");
message2.setText("");
} catch (ClassNotFoundException ex) {
// Executes if the driver can't be found
// debug:
if (debug == 1)
{
message1.setText("Error: "+ex.getMessage());
message2.setText("");
} else
message1.setText("Driver Error: contact admin");
message2.setText("");
}
}
/**
Method to add the entered information to the database.<!-- -->Once the information is added to the database, clear the form fields.
*/
private void DatabaseAdd()
{ try
{
url = url+DBname;
DBConnection();
// Statement objects executes a SQL query
// createStatement returns a Statement object
Statement s = conn.createStatement();
// Prepare the query and values to be inserted into the database
String str="INSERT INTO donations(name,charity,amount) VALUES (?,?,?)";
java.sql.PreparedStatement statement = conn.prepareStatement(str);
statement.setString(1,textName.getText());
statement.setString(2,Charity);
statement.setDouble(3,dAmount);
statement.executeUpdate();
// Reset form after saved to database
textName.setText("");
textAmount.setText("");
charityList.setSelectedIndex(0);
s.close();
DatabaseLoad(); // Call the Database Info
} catch (SQLException ex) {
// debug:
if (debug == 1)
{
message1.setText("Error: "+ex.getMessage());
message2.setText("Error: "+ex.getErrorCode());
} else
message1.setText("Database Error: contact admin");
message2.setText("");
}
}
/**
Method will load the database information and display it in Frame in a JTable.
*/
private void DatabaseLoad()
{ try
{
url = url+DBname;
DBConnection();
// Statement objects executes a SQL query
// createStatement returns a Statement object
Statement s = conn.createStatement();
// This is the query I'm sending to the database
String selectStuff = "SELECT `name`, `charity`, `amount` FROM `"+DBname+"`.`donations` ";
// A ResultSet contains a table of data representing the
// results of the query. It can not be changed and can
// only be read in one direction
rows = s.executeQuery(selectStuff);
// Set the table RowCount to 0
dTableModel.setRowCount(0);
// Temporarily holds the row results
Object[] tempRow;
// next is used to iterate through the results of a query
while(rows.next())
{
// Gets the column values based on class type expected
tempRow = new Object[]{rows.getString(1), rows.getString(2), rows.getDouble(3) };
dTableModel.addRow(tempRow); // Adds the row of data to the end of the model
}
// Successfully loaded, message the user
message1.setText("<html><font color='red'>Database Info Loaded</font>");
message2.setText("");
s.close();
} catch (SQLException ex) {
// debug:
if (debug == 1)
{
message1.setText("Error: "+ex.getMessage());
message2.setText("Error: "+ex.getErrorCode());
} else
message1.setText("Database Error: contact admin");
message2.setText("");
}
}
/**
Method will create the database if it does not exist.
*/
private void CreateDatabase()
{ try
{
DBConnection();
// Statement objects executes a SQL query
// createStatement returns a Statement object
Statement s = conn.createStatement();
String dbCreate = "CREATE DATABASE "+DBname;
s.executeUpdate(dbCreate);
s.close();
} catch(SQLException ex){
// debug:
if (debug == 1)
{
message1.setText("Error: "+ex.getMessage());
message2.setText("Error: "+ex.getErrorCode());
}
} catch(Exception ex){
// debug:
if (debug == 1)
{
message1.setText("Error: "+ex.getMessage());
message2.setText("");
}
}
CreateTables();
}
/**
Method will create the table needed in the database.
*/
private void CreateTables()
{ try
{
DBConnection();
// Statement objects executes a SQL query
// createStatement returns a Statement object
Statement s = conn.createStatement();
String tableCreate = "create table "+DBname+".donations " + "(`name` varchar(200), " + "`charity` varchar(200), " + "amount double)";
s.executeUpdate(tableCreate);
// After creating the tables
// Load the information from the textfile
LoadTextFile();
s.close();
} catch(SQLException ex){
// debug:
if (debug == 1)
{
message1.setText("Error: "+ex.getMessage());
message2.setText("Error: "+ex.getErrorCode());
}
} catch(Exception ex){
// debug:
if (debug == 1)
{
message1.setText("Error: "+ex.getMessage());
message2.setText("");
}
}
}
public void LoadTextFile()
{
}
// To change justification to the right
class RightTableCellRenderer extends DefaultTableCellRenderer {
public RightTableCellRenderer() {
setHorizontalAlignment(JLabel.RIGHT);
}
}
// Main method calls the constructor
public static void main(String[] args)
{
new Charity();
}
}

Following code snippet will solve your problem.
public class Test {
public static void main( String[] args ) throws Exception
{
HashMap<String, Person> personMap = new HashMap<String, Person>();
try
{
BufferedReader in = new BufferedReader( new FileReader( "File Path" ) );
String str;
Person person = new Person();
int count = 0;
String key = "";
while( ( str = in.readLine() ) != null )
{
if ( null != str && str.trim().length() == 0 )
{
personMap.put( key, person );
count = -1;
person = new Person();
}
else {
String arr[] = str.split( " " );
key = arr[0];
if (count == 0) {
person.setName( arr[1] );
}
else if (count == 1) {
person.setAge( arr[1] );
}
else if (count == 2) {
person.setAddress( arr[1] );
}
}
count ++;
}
personMap.put( key, person );
in.close();
}
catch( IOException e )
{
System.out.println( "Exception" + e.getMessage() );
}
}
}
public class Person
{
private String name = null;
private String age = null;
private String Address = null;
public String getName()
{
return name;
}
public void setName( String name )
{
this.name = name;
}
public String getAge()
{
return age;
}
public void setAge( String age )
{
this.age = age;
}
public String getAddress()
{
return Address;
}
public void setAddress( String address )
{
Address = address;
}
}
I hope it helps

Use BufferedReader to read one line at a time, extract the required info from that line and assign it to the variables. In case you want to hold it in the memory, use a POJO with those 3 properties.
You may use regex to split the line and get the required value(s).

I wrote a set of functions that does something similar. I use a bufferedReader like the other user suggested.
public ArrayList<String> readFileToMemory(String filepath)
{
BufferedReader br = null;
String currentLine = null;
ArrayList<String> fileContents = new ArrayList<String>();
try
{
br = new BufferedReader(new FileReader(filepath));
while((currentLine = br.readLine()) != null)
{
//fileContents.add(br.readLine());
fileContents.add(currentLine);
}
}
catch(IOException e)
{
e.printStackTrace();
}
finally
{
try
{
br.close();
}
catch(IOException e)
{
e.printStackTrace();
}
}
return fileContents;
}
This will just read in the each line of a file as a separate entry in a list. Just take the entries and do what you need.

If you're only doing this once, just do 3 replaces in notepad ++
Replace \r\n\r\n with "|||"
replace \r\n with ","
replace ||| with \r\n
then you've got a regular .csv file.