Discussion Board 2William Denison27 NOV 2014A Java class t.docx

Discussion Board 2
William Denison
27 NOV 2014
A Java class that allows writing to files is Class FileWriter.
This class is a part of java.io package and extends (inherits
from) OutputStreamWriter class.
This class allows us to write character files conveniently. The
reason I chose this class is because of the functionality provided
by FileWriter class. It allows us to write to a new file, as well
as append content to an existing file. Given a filename as a
string parameter, it creates the file if it does not already exist.
So, the user is not required to explicitly create a new file before
writing to it using FileWriter class.
FileWriter class provides several constructors, which are as
follows:
1) FileWriter(File file) - takes File object as a parameter,
which corresponds to the file, the data is to be written to.
2) FileWriter(File file, boolean append) - takes two parameters:
one is the File object to which data is to be written to, and
second is a boolean parameter which indicates whether data is
to be appended to the file
3) FileWriter(String filename) - takes a string parameter for the
filename
4) FileWriter(String filename, Boolean append) - takes two
parameters, one for the filename (string) and a Boolean value
indicating whether data should be appended to the file or not
Pseudo code:
1. Create a string array and initialize elements of the array with
given data
String[] dataArray = new String[4];
dataArray[0] = "1001 Jennifer Ward SUPPLIES 2140.20
BOOKS 5200.10 PAPER 455.23 NORTH Phone";

dataArray[1] = "1003 Athena Andrews SUPPLIES 5155.55
BOOKS 6300.50 PAPER 223.25 SOUTH Email";
dataArray[2] = "1005 Andy Smith SUPPLIES 6155.55
BOOKS 300.50 PAPER 55.55 SOUTH Email";
dataArray[3] = "1006 Robert Stearns SUPPLIES 7255.55
BOOKS 8300.50 PAPER 77.77 SOUTH Phone";
2. Create a File object and pass the filename
File file = new File(“data.txt”);
3. Check if file exits by that name, if it does not create a new
file as follows:
file.createNewFile();
4. Create FileWriter object by passing the File object created
above
5. In a for loop write each element of the array to the file:
for(int i=0; i<dataArray.length; i++){
writer.write(dataArray[i]); //write the line to file
writer.write("n"); //write a newline to the file
}
6. Close the writer.
7. Catch any exceptions if thrown
RealCode:
import java.io.*;
class FileWritingExample
{
public static void main(String args[]){
String[] dataArray = new String[4];

dataArray[0] = "1001 Jennifer Ward SUPPLIES
2140.20 BOOKS 5200.10 PAPER 455.23 NORTH Phone";
dataArray[1] = "1003 Athena Andrews SUPPLIES
5155.55 BOOKS 6300.50 PAPER 223.25 SOUTH Email";
dataArray[2] = "1005 Andy Smith SUPPLIES
6155.55 BOOKS 300.50 PAPER 55.55 SOUTH Email";
dataArray[3] = "1006 Robert Stearns SUPPLIES
7255.55 BOOKS 8300.50 PAPER 77.77 SOUTH Phone";
try{
File file = new File("data.txt");
//check if file already exists
if(!file.exists()){
file.createNewFile(); //create a
new file if it does not exist
}
//create FileWriter object using File object
created above
FileWriter writer = new FileWriter(file);
//write content to file
for(int i=0; i<dataArray.length; i++){
writer.write(dataArray[i]); //write
the line to file
writer.write("n"); //write
a newline to the file
}
writer.flush();
writer.close(); //close the writer stream
}catch(IOException ioe){
//display the exception stacktrace

System.out.println("Error while writing to the
file");
ioe.printStackTrace();
}
}
}
ProjectGUI/nbproject/private/private.properties
compile.on.save=true
user.properties.file=/home/an/.netbeans/7.1.1/build.properties
ProjectGUI/src/projectgui/GUI.form
ProjectGUI/src/projectgui/GUI.javaProjectGUI/src/projectgui/G
UI.java/*
* GUI.java
*
*/
package projectgui;
import java.awt.Color;
import javax.swing.JOptionPane;
/**
*
* @author Asma Niaz
*/
publicclass GUI extends javax.swing.JFrame{
/**

* Creates new form SingleNeutronRun
*/
public GUI(){
initComponents();
}
/**
* This method is called from within the constructor to initial
ize the form.
* WARNING: Do NOT modify this code. The content of this
method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-
fold defaultstate="collapsed" desc="Generated Code">//GEN-
BEGIN:initComponents
privatevoid initComponents(){
operationsButtonGroup =new javax.swing.ButtonGroup();
buttonGroup1 =new javax.swing.ButtonGroup();
districtPanel =new javax.swing.JPanel();
northRadioButton =new javax.swing.JRadioButton();
eastRadioButton =new javax.swing.JRadioButton();
southRadioButton =new javax.swing.JRadioButton();
westRadioButton =new javax.swing.JRadioButton();
inputPanel =new javax.swing.JPanel();
jTextField2 =new javax.swing.JTextField();
jLabel1 =new javax.swing.JLabel();
inputPanel1 =new javax.swing.JPanel();

runButton =new javax.swing.JButton();
exitButton =new javax.swing.JButton();
DataPanel=new javax.swing.JPanel();
jScrollPane1 =new javax.swing.JScrollPane();
dataTextArea =new javax.swing.JTextArea();
districtPanel1 =new javax.swing.JPanel();
phoneCheckBox =new javax.swing.JCheckBox();
emailCheckBox =new javax.swing.JCheckBox();
visitCheckBox =new javax.swing.JCheckBox();
setDefaultCloseOperation(javax.swing.WindowConstants.
EXIT_ON_CLOSE);
setTitle("Single Neuron Perceptron");
districtPanel.setBorder(javax.swing.BorderFactory.createT
itledBorder("Select District"));
buttonGroup1.add(northRadioButton);
northRadioButton.setSelected(true);
northRadioButton.setText("North");
buttonGroup1.add(eastRadioButton);
eastRadioButton.setText("East");
buttonGroup1.add(southRadioButton);
southRadioButton.setText("South");
buttonGroup1.add(westRadioButton);
westRadioButton.setText("West");
javax.swing.GroupLayout districtPanelLayout =new javax.
swing.GroupLayout(districtPanel);

districtPanel.setLayout(districtPanelLayout);
districtPanelLayout.setHorizontalGroup(
districtPanelLayout.createParallelGroup(javax.swing.Gr
oupLayout.Alignment.LEADING)
.addGroup(districtPanelLayout.createSequentialGroup()
.addContainerGap()
.addGroup(districtPanelLayout.createParallelGroup(javax.swing
.GroupLayout.Alignment.LEADING)
.addComponent(northRadioButton)
.addComponent(eastRadioButton)
.addComponent(southRadioButton)
.addComponent(westRadioButton))
.addContainerGap(69,Short.MAX_VALUE))
);
districtPanelLayout.setVerticalGroup(
districtPanelLayout.createParallelGroup(javax.swing.Gr
.addGroup(districtPanelLayout.createSequentialGroup()
.addComponent(northRadioButton)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacemen
t.RELATED)
.addComponent(southRadioButton)
t.RELATED)
.addComponent(eastRadioButton)
t.RELATED)
.addComponent(westRadioButton))
);
northRadioButton.getAccessibleContext().setAccessibleNa
me("northRadioButton");
inputPanel.setBorder(javax.swing.BorderFactory.createTitl
edBorder("Enter Values"));

jTextField2.addFocusListener(new java.awt.event.FocusA
dapter(){
publicvoid focusLost(java.awt.event.FocusEvent evt){
jTextField2FocusLost(evt);
}
});
dapter(){
}
});
dapter(){
}
});
jLabel1.setText("Sales Rep ID");
jLabel2.setText("Sales Rep First Name");
jLabel3.setText("Sales Rep Last Name");
inputPanel1.setBorder(javax.swing.BorderFactory.createTi
tledBorder("Amounts Sold"));
dapter(){
}
});

dapter(){
}
});
dapter(){
}
});
jLabel5.setText("Books");
jLabel6.setText("Paper");
jLabel4.setText("Office Supplies");
javax.swing.GroupLayout inputPanel1Layout =new javax.s
wing.GroupLayout(inputPanel1);
inputPanel1.setLayout(inputPanel1Layout);
inputPanel1Layout.setHorizontalGroup(
inputPanel1Layout.createParallelGroup(javax.swing.Gr
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, in
putPanel1Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE,S
hort.MAX_VALUE)
.addGroup(inputPanel1Layout.createParallelGroup(javax.swing.
GroupLayout.Alignment.LEADING)
.addComponent(jLabel4)
.addComponent(jLabel5))

t.RELATED)
GroupLayout.Alignment.LEADING,false)
.addComponent(jTextField5, javax.swing.GroupLayout.Alignme
nt.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE,133,
Short.MAX_VALUE)
nt.TRAILING)
.addComponent(jTextField6))
.addContainerGap())
);
inputPanel1Layout.setVerticalGroup(
inputPanel1Layout.createParallelGroup(javax.swing.Gr
.addGroup(inputPanel1Layout.createSequentialGroup()
.addGroup(inputPanel1Layout.createSequentialGroup()
.addGap(4,4,4)
.addComponent(jTextField4, javax.swing.GroupLayout.PREFER
RED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.s
wing.GroupLayout.PREFERRED_SIZE)))
t.RELATED)
wing.GroupLayout.PREFERRED_SIZE)
t.RELATED)

.addComponent(jLabel6)))
);
javax.swing.GroupLayout inputPanelLayout =new javax.s
wing.GroupLayout(inputPanel);
inputPanel.setLayout(inputPanelLayout);
inputPanelLayout.setHorizontalGroup(
inputPanelLayout.createParallelGroup(javax.swing.Gro
upLayout.Alignment.LEADING)
.addGroup(inputPanelLayout.createSequentialGroup()
.addContainerGap()
.addGroup(inputPanelLayout.createParallelGroup(javax.swing.G
roupLayout.Alignment.LEADING)
t.UNRELATED)
.addComponent(jTextField2)
nt.TRAILING)
.addComponent(jTextField1)))
.addGap(0,21,Short.MAX_VALUE)
.addComponent(inputPanel1, javax.swing.GroupLayout.PREFE
RRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax
.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())

);
inputPanelLayout.setVerticalGroup(
inputPanelLayout.createParallelGroup(javax.swing.Gro
upLayout.Alignment.LEADING)
roupLayout.Alignment.BASELINE)
t.RELATED)
t.RELATED)
.addGap(18,18,18)
.addComponent(inputPanel1, javax.swing.GroupLayout.PREFE
RRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax
.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE,S
hort.MAX_VALUE))
);
runButton.setText("ENTER");

runButton.addActionListener(new java.awt.event.ActionLi
stener(){
publicvoid actionPerformed(java.awt.event.ActionEvent evt){
runButtonActionPerformed(evt);
}
});
exitButton.setText("QUIT");
exitButton.addActionListener(new java.awt.event.ActionLi
stener(){
publicvoid actionPerformed(java.awt.event.ActionEvent evt){
exitButtonActionPerformed(evt);
}
});
DataPanel.setBorder(javax.swing.BorderFactory.createTitledBor
der("Sales Representative Data"));
dataTextArea.setColumns(20);
dataTextArea.setRows(5);
jScrollPane1.setViewportView(dataTextArea);
javax.swing.GroupLayoutDataPanelLayout=new javax.swi
ng.GroupLayout(DataPanel);
DataPanel.setLayout(DataPanelLayout);

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Discussion Board 2William Denison27 NOV 2014A Java class t.docx