Text File I/O - DVD.java



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Text File I/O - DVD.java
0 Answer(s)      7 years ago
Posted in : Java Beginners

The application should use a text file with one value on each line of the file. Each movie would use three lines: one for title; one for studio; one for year.

When the application starts, read the data file and populate the array. When the file ends, use the array to recreate the file.

Here is my code but I need to modify it to the specifications on top. I don't know where to begin.


//package dvd;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import java.io.*;
import java.util.*;

public class DVD extends JFrame implements ActionListener
//Declare output stream
DataOutputStream output;

//construct components
JLabel sortPrompt = new JLabel("Sort by:");
JComboBox fieldCombo = new JComboBox();
JTextPane textPane = new JTextPane();

//initialize data in arrays
String title[] = {"Casablanca", "Citizen Kane", "Singin' in the Rain", "The Wizard of Oz"};
String studio[] = {"Warner Brothers", "RKO Pictures", "MGM", "MGM" };
String year[] = {"1942", "1941", "1952", "1939"};

//construct instance of DVD
public DVD()
super("Classics on DVD");

//create the menu system
public JMenuBar createMenuBar()
//create an instance of the menu
JMenuBar mnuBar = new JMenuBar();

//construct and populate the File menu
JMenu mnuFile =new JMenu("File", true);

JMenuItem mnuFileOpen = new JMenuItem("Open");

JMenuItem mnuFileExit = new JMenuItem("Exit");

//construct and populate the Edit menu
JMenu mnuEdit = new JMenu("Edit", true);

JMenuItem mnuEditInsert = new JMenuItem("Insert New DVD");

JMenu mnuEditSearch = new JMenu("Search");

JMenuItem mnuEditSearchByTitle = new JMenuItem("by Title");

JMenuItem mnuEditSearchByStudio = new JMenuItem("by Studio");

JMenuItem mnuEditSearchByYear = new JMenuItem("by Year");

return mnuBar;

//create the content pane
public void createContentPane()
//populate the JComboBox
fieldCombo.setToolTipText("Click the drop down arrow to display sort fields.");

//construct and populate the north panel
JPanel northPanel = new JPanel();
northPanel.setLayout(new FlowLayout());

//create the JTextPane and center panel
JPanel centerPanel = new JPanel();
textPane = addTextToTextPane();
JScrollPane scrollPane = new JScrollPane(textPane);
scrollPane.setPreferredSize(new Dimension(500, 200));

//create Container and set attributes
// Container c = getContentPane();
setLayout(new BorderLayout(10,10));

// return c;

//method to create tab stops and set font styles
protected void setTabsAndStyles(JTextPane textPane)
//create Tab Stops
TabStop[] tabs = new TabStop[2];
tabs[0] = new TabStop(200, TabStop.ALIGN_LEFT, TabStop.LEAD_NONE);
tabs[1] = new TabStop(350, TabStop.ALIGN_LEFT, TabStop.LEAD_NONE);
TabSet tabset = new TabSet(tabs);

//set Tab Style
StyleContext tabStyle = StyleContext.getDefaultStyleContext();
AttributeSet aset =
tabStyle.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.TabSet, tabset);
textPane.setParagraphAttributes(aset, false);

//set Font Style
Style fontStyle =

Style regular = textPane.addStyle("regular", fontStyle);
StyleConstants.setFontFamily(fontStyle, "SansSerif");

Style s = textPane.addStyle("italic", regular);
StyleConstants.setItalic(s, true);

s = textPane.addStyle("bold", regular);
StyleConstants.setBold(s, true);

s = textPane.addStyle("large", regular);
StyleConstants.setFontSize(s, 16);

//method to add new text to the JTextPane
public JTextPane addTextToTextPane()
Document doc = textPane.getDocument();
//clear previous text
doc.remove(0, doc.getLength());

//insert title

//insert detail
for (int j = 0; j<title.length; j++)
doc.insertString(doc.getLength(), title[j] + "\t", textPane.getStyle("bold"));
doc.insertString(doc.getLength(), studio[j] + "\t", textPane.getStyle("italic"));
doc.insertString(doc.getLength(), year[j] + "\n", textPane.getStyle("regular"));
catch(BadLocationException ble)
System.err.println("Couldn't insert text.");

return textPane;

//event to process user clicks
public void actionPerformed(ActionEvent e)
String arg = e.getActionCommand();

//user clicks the sort by combo box
if (e.getSource() == fieldCombo)
switch (fieldCombo.getSelectedIndex())
case 0:
case 1:
case 2:

//user clicks Exit on the File menu
if (arg == "Exit")

//user clicks Insert new DVD on the Edit menu
if (arg == "Insert")
//accept new data
String newTitle = JOptionPane.showInputDialog(null, "Please enter the new movie's title");
String newStudio = JOptionPane.showInputDialog(null, "Please enter the studio for " + newTitle);
String newYear = JOptionPane.showInputDialog(null, "Please enter the year for " + newTitle);

//enlarge arrays
title = enlargeArray(title);
studio = enlargeArray(studio);
year = enlargeArray(year);

//add new data to arrays
title[title.length-1] = newTitle;
studio[studio.length-1] = newStudio;
year[year.length-1] = newYear;

//call sort method

//user clicks Title on the Search submenu
if (arg == "title")
search(arg, title);

//user clicks Studio on the Search submenu
if (arg == "studio")
search(arg, studio);

//user clicks Year on the Search submenu
if (arg == "year")
search(arg, year);

//method to enlarge an arry by 1
public String[] enlargeArray(String[] currentArray)
String[] newArray = new String[currentArray.length +1];
for (int i = 0; i<currentArray.length; i++)
newArray[i] = currentArray[i];
return newArray;

//method to sort arrays
public void sort(String tempArray[])
// loop to control number of passes
for (int pass = 1; pass < tempArray.length; pass++)
for (int element = 0; element < tempArray.length - 1; element++)
if (tempArray[element].compareTo(tempArray[element + 1])>0)
swap(title, element, element + 1);
swap(studio, element, element + 1);
swap(year, element, element + 1);

// method to swap two elements of an array
public void swap(String swapArray[], int first, int second)
String hold; // temporary holding area for swap
hold = swapArray[first];
swapArray[first] = swapArray[second];
swapArray[second] = hold;

public void search(String searchField, String searchArray[])
Document doc = textPane.getDocument(); //assign text to document object
doc.remove(0,doc.getLength()); //clear previous text

//display column titles

//prompt user for search data
String search = JOptionPane.showInputDialog(null, "Please enter the "+ searchField);
boolean found = false;

//search arrays
for (int i = 0; i<title.length; i++)
if (search.compareTo(searchArray[i])==0)
doc.insertString(doc.getLength(), title[i] + "\t", textPane.getStyle("bold"));
doc.insertString(doc.getLength(), studio[i] +"\t",textPane.getStyle("italic"));
doc.insertString(doc.getLength(), year[i] + "\n", textPane.getStyle("regular"));
found = true;
if (found == false)
JOptionPane.showMessageDialog(null, "Your search produced no results.","No results found",JOptionPane.INFORMATION_MESSAGE);
catch(BadLocationException ble)
System.err.println("Couldn't insert text.");

public void OpenFile()
Date today = new Date();
//SimpleDateFormat myFormat = new SimpleDateFormat("MMddyyyy");
String filename = "payments" /*+ myFormat.format(today)*/;
output = new DataOutputStream(new FileOutputStream(filename));

catch(IOException io)
JOptionPane.showMessageDialog(null,"The program could not create a storage location. Please check the disk drive and then run the program again.","Error",JOptionPane.INFORMATION_MESSAGE);

new WindowAdapter()
public void windowClosing(WindowEvent e)
int answer = JOptionPane.showConfirmDialog(null, "Are you sure you want to exit and submit the file?", "File Submission", JOptionPane.YES_NO_OPTION);
if (answer == JOptionPane.YES_OPTION)
public void actionFileOutput(ActionEvent e)
String arg = e.getActionCommand();

for(int i=0; i<title.length; i++)
JOptionPane.showMessageDialog(null,"The payment information has been saved.","Submission Successful",JOptionPane.INFORMATION_MESSAGE);
catch(IOException c)


//main method executes at run time
public static void main(String args[])
DVD f = new DVD();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
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