Ok so I will try to make this as understandable as possible.
I have created a simple GUI with an "open" button and a textArea (along with other stuff but that's not important right now). Basically I am creating a method that when I click the Open button it displays the contents of the file in the textArea.
I believe 99% of the method I have written is correct but I keep getting a NullPointerException and I don't quite understand why. Hopefully my code will clear up any confusion on what I am asking, I will comment on the line of code where I get the exception. Here is my code:
Application class (Basic setup of my GUI):
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
public class Application extends JFrame {
public OutputPanel outPanel = new OutputPanel();
public BarcodePanel barPanel = new BarcodePanel();
public ButtonPanel btnPanel = new ButtonPanel();
public ReferencePanel refPanel = new ReferencePanel();
public Application() {
super("Book Processor");
this.setLayout(new BorderLayout());
btnPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
outPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
refPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
add(btnPanel, BorderLayout.NORTH);
add(outPanel, BorderLayout.WEST);
add(refPanel,BorderLayout.SOUTH);
}//end constructor
public static void main(String[] args) {
Application frame = new Application();
frame.setSize(1000,500);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}//end main
}//end class
The next set of code is my ButtonPanel class(this is where I am having an issue) So I have an openFile method, that when I click the button it should display the contents of the file in the textArea. Again I receive a NullPointerException and I do not understand why. Here is the code for this class:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.Closeable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Scanner;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
public class ButtonPanel extends JPanel{
JButton btnOpen = new JButton("Open");
OutputPanel outPanel = new OutputPanel();
Scanner input;
public ButtonPanel() {
ButtonHandler handler = new ButtonHandler();
add(btnOpen);
btnOpen.addActionListener(handler);
}//end constructor
/**
* Method for displaying the file onto the textArea.
*
*/
private void openFile() {
JFileChooser chooser = new JFileChooser();
chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
int result = chooser.showOpenDialog(this);
String fileName;
fileName = chooser.getSelectedFile().getAbsolutePath();
try {
Scanner input = new Scanner(Paths.get(fileName));
StringBuilder sb = new StringBuilder();
while(input.hasNextLine()) {
sb.append(input.nextLine()+ "\n");
}
outPanel.txtOutput.setText(sb.toString());//my issue is with this line right here
} catch (IOException e) {
e.printStackTrace();
}
finally {
input.close();
}
}//end readFile
private class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent e) {
if(e.getSource()== btnOpen) {
openFile();
}
}//end actionPerformed
}//end actionlistener
}//end class
Here is my last class, OutputPanel, this class contains the JTextArea:
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class OutputPanel extends JPanel{
public JTextArea txtOutput = new JTextArea(20,50);
public OutputPanel() {
add(txtOutput);
}//end constructor
}//end class
How do I get the textArea to display the contents of the file? More importantly, why am I getting this exception and what can I do to fix it? Hopefully this makes as much sense as possible, and I really appreciate any and all input from you guys.
Your NullPointerException is actually been caused by
} finally {
input.close();
}
Because input is null (well, obviously). This is because you're shadowing the variable in the try-catch block
try {
Scanner input = new Scanner(Paths.get(fileName));
//...
} finally {
// This is null because the instance field has not been initialised
input.close();
}
A better solution would be to make use of the try-with-resources statement
try (Scanner input = new Scanner(Paths.get(fileName))) {
StringBuilder sb = new StringBuilder();
while (input.hasNextLine()) {
sb.append(input.nextLine() + "\n");
}
outPanel.txtOutput.setText(sb.toString());//my issue is with this line right here
} catch (IOException e) {
e.printStackTrace();
}
An even better solution would be to make use of JTextArea's ability to read the contents of a Reader, for example...
try (FileReader reader = new FileReader(chooser.getSelectedFile())) {
outPanel.txtOutput.read(reader, fileName);
} catch (IOException e) {
e.printStackTrace();
}
Now, before you ask why there's no content in your text area, the reason is because you create a new instance of OutputPanel in your ButtonPanel class, this has no relationship to the instance you created in your Application and added to the screen.
You will need to pass an instance of the OutputPanel to the ButtonPanel (via the constructor) so the references match up.
Personally, a better solution would be define an interface which had a read method which took a File. OutputPanel would implement this interface and ButtonPanel would require a reference to an instance of this interface. This decouples the code and prevents ButtonPanel from making unnecessary changes to the OutputPanel - because it's really not it's responsibility to do so - it's the OutputPanels responsibility to load the file and display it
Related
Ok so I will try to make this as understandable as possible. I have created a simple GUI with an "open" button and a textArea (along with other stuff but that's not important right now). Basically I am creating a method that when I click the Open button it displays the contents of the file in the textArea. I believe 99% of the method I have written is correct but I keep getting a NullPointerException and I don't quite understand why. Hopefully my code will clear up any confusion on what I am asking, I will comment on the line of code where I get the exception. Here is my code:
Application class (Basic setup of my GUI):
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
public class Application extends JFrame {
public OutputPanel outPanel = new OutputPanel();
public BarcodePanel barPanel = new BarcodePanel();
public ButtonPanel btnPanel = new ButtonPanel();
public ReferencePanel refPanel = new ReferencePanel();
public Application() {
super("Book Processor");
this.setLayout(new BorderLayout());
btnPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
outPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
refPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
add(btnPanel, BorderLayout.NORTH);
add(outPanel, BorderLayout.WEST);
add(refPanel,BorderLayout.SOUTH);
}//end constructor
public static void main(String[] args) {
Application frame = new Application();
frame.setSize(1000,500);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}//end main
}//end class
The next set of code is my ButtonPanel class(this is where I am having an issue) So I have an openFile method, that when I click the button it should display the contents of the file in the textArea. Again I receive a NullPointerException and I do not understand why. Here is the code for this class:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.Closeable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Scanner;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
public class ButtonPanel extends JPanel{
JButton btnOpen = new JButton("Open");
OutputPanel outPanel = new OutputPanel();
Scanner input;
public ButtonPanel() {
ButtonHandler handler = new ButtonHandler();
add(btnOpen);
btnOpen.addActionListener(handler);
}//end constructor
/**
* Method for displaying the file onto the textArea.
*
*/
private void openFile() {
JFileChooser chooser = new JFileChooser();
chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
int result = chooser.showOpenDialog(this);
String fileName;
fileName = chooser.getSelectedFile().getAbsolutePath();
try {
Scanner input = new Scanner(Paths.get(fileName));
StringBuilder sb = new StringBuilder();
while(input.hasNextLine()) {
sb.append(input.nextLine()+ "\n");
}
outPanel.txtOutput.setText(sb.toString());//my issue is with this line right here
} catch (IOException e) {
e.printStackTrace();
}
finally {
input.close();
}
}//end readFile
private class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent e) {
if(e.getSource()== btnOpen) {
openFile();
}
}//end actionPerformed
}//end actionlistener
}//end class
Here is my last class, OutputPanel, this class contains the JTextArea:
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class OutputPanel extends JPanel{
public JTextArea txtOutput = new JTextArea(20,50);
public OutputPanel() {
add(txtOutput);
}//end constructor
}//end class
How do I get the textArea to display the contents of the file. More importantly why am I getting this exception and what can I do to fix it. Hopefully this makes as much sense as possible, and I really appreciate any and all input from you guys.
I want to create a simple stand-alone application that will take some input from user (some numbers and mathematical functions f(x,y...)) and write them to a file. Then with the help of this file I will run a command.
Basic ingredients that I need:
-- JTextArea for users input.
-- ButtonHandler/ActionListener and writing of the input to a (txt) file
-- ButtonHandler/ActionLister to execute a command
What is the best way to do it?
A current running code that I have (basically a toy) - which does not write anything, just executes - is:
import java.applet.*;
import java.lang.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Dialog;
import java.io.IOException;
import java.io.InputStream;
import java.io.*;
import java.util.*;
import java.io.BufferedWriter;
public class Runcommand3
{
public static void main(String[] args) throws FileNotFoundException, IOException
{
//JApplet applet = new JApplet();
//applet.init();
final JFrame frame = new JFrame("Change Backlight");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
panel.setLayout(null);
frame.add(panel);
JButton button = new JButton("Click me to Run");
button.setBounds(55,100,160,30);
panel.add(button);
frame.setSize(260,180);
frame.setVisible(true);
//This is an Action Listener which reacts to clicking on the button
button.addActionListener(new ButtonHandler());
}
}
class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent event){
double value = Double.parseDouble(
JOptionPane.showInputDialog("please enter backlight value"));
//File theFile = new File("thisfile.txt");
//theFile.write(value);
String command = "xbacklight -set " + value;
try{Runtime run = Runtime.getRuntime();
Process pr = run.exec(command);}
catch(IOException t){t.printStackTrace();}
}
}
In the above example how can I write 'value' to a file? Then, how can I add more input (more textfields)? Can I do it in the same class or I need more?
My confusion comes (mainly but not only) from the fact that inside the ButtonHandler class I can NOT define any other objects (ie, open and write files etc).
This is the way I would write to a file. I will let you convert this code into your GUI for practice. See more on BufferedWriter and FileWriter
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.util.Scanner;
public class Files {
public static void main(String args[]){
System.out.print("Enter Text: ");
Scanner scan = new Scanner(System.in);
String text = scan.nextLine();
FileWriter fWriter = null;
BufferedWriter writer = null;
try {
fWriter = new FileWriter("text.txt");
writer = new BufferedWriter(fWriter);
writer.write(text);
writer.newLine();
writer.close();
System.err.println("Your input of " + text.length() + " characters was saved.");
} catch (Exception e) {
System.out.println("Error!");
}
}
}
For your second question, you may like to consider having a JTextField on your JFrame for the user to enter lines into instead of a JOptionPane. It's just a simple text box, and you can add the box's contents to the file every time the button is pressed:
public static void main(String[] args) {
JTextField myTextField = new JTextField();
// Your code, set size and position of textfield
panel.add(myTextField);
}
class ButtonHandler implements ActionListener {
public void actionPerformed(ActionEvent event) {
String text = myTextField.getText();
myTextField.setText("");
new BufferedWriter(new FileWriter("text.txt")).write(text).newLine().close();
// the rest of your code
}
}
I'm working on this project and I need it run as an applet and an application. This is what I have but I stuck on where to go because I can't find anything on the internet. Are there any resources or does someone have some quick advice to give me?
public class Project extends JApplet {
public void init() {
try {
URL pictureURL = new URL(getDocumentBase(), "sample.jpg");
myPicture = ImageIO.read(pictureURL);
myIcon = new ImageIcon(myPicture);
myLabel = new JLabel(myIcon);
} catch (Exception e) {
e.printStackTrace();
}
add(label, BorderLayout.NORTH);
add(bio);
add(bio, BorderLayout.CENTER);
pane.add(play);
getContentPane().add(pane, BorderLayout.SOUTH);
play.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try{
FileInputStream FIS = new FileInputStream("sample.mp3");
player = new Player (FIS);
player.play();
} catch (Exception e1) {
e1.printStackTrace();
}}});
}
public static void main(String args[]) {
JFrame frame = new JFrame("");
frame.getContentPane().add();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.show();
}
private JPanel pane = new JPanel();
private TextArea bio = new TextArea("Bio");
private JButton play = new JButton("Play");
private Image myPicture;
private ImageIcon icon;
private JLabel label;
private Player player;
}
When trying to run something as an applet and as an application, there are several caveats.
Applets have a certain life cycle that must be obeyed. One can add the applet to the content pane of the JFrame and manually call init(), but in general, if the applet expects its start() or stop() methods to be called, things may become tricky...
More importantly: The way how resources are handled is different between applets and applications.
Handling files in applets (e.g. with a FileInputStream) may have security implications, and will plainly not work in some cases - e.g. when the applet is embedded into a website. (Also see What Applets Can and Cannot Do).
Conversely, when running this as an application, calling getDocumentBase() does not make sense. There simply is no "document base" for an application.
Nevertheless, it is possible to write a program that can be shown as an Applet or as an Application. The main difference will then be whether the main JPanel is placed into a JApplet or into a JFrame, and how data is read.
One approach for reading data that works for applets as well as for applications is via getClass().getResourceAsStream("file.txt"), given that the respective file is in the class path.
I hesitated a while, whether I should post an example, targeting the main question, or whether I should modify your code so that it works. I'll do both:
Here is an example that can be executed as an Applet or as an Application. It will read and display a "sample.jpg". (This file is currently basically expected to be "in the same directory as the .class-file". More details about resource handling, classpaths and stream handling are beyond the scope of this answer)
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class AppletOrApplicationExample extends JApplet
{
#Override
public void init()
{
add(new AppletOrApplicationMainComponent());
}
public static void main(String args[])
{
JFrame frame = new JFrame("");
frame.getContentPane().add(new AppletOrApplicationMainComponent());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}
class AppletOrApplicationMainComponent extends JPanel
{
public AppletOrApplicationMainComponent()
{
super(new BorderLayout());
InputStream stream = getClass().getResourceAsStream("sample.jpg");
if (stream == null)
{
add(new JLabel("Resource not found"), BorderLayout.NORTH);
}
else
{
try
{
BufferedImage image = ImageIO.read(stream);
add(new JLabel(new ImageIcon(image)), BorderLayout.NORTH);
}
catch (IOException e1)
{
add(new JLabel("Could not load image"), BorderLayout.NORTH);
}
}
JTextArea textArea = new JTextArea("Text...");
add(textArea, BorderLayout.CENTER);
JButton button = new JButton("Button");
button.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
doSomething();
}
});
add(button, BorderLayout.SOUTH);
}
private void doSomething()
{
System.out.println("Button was clicked");
}
}
And here is something that is still a bit closer to your original code. However, I'd strongly recommend to factor out the actual application logic as far as possible. For example, your main GUI component should then not be the applet itself, but a JPanel. Resources should not be read directly via FileInputStreams or URLs from the document base, but only from InputStreams. This is basically the code that you posted, with the fewest modifications that are necessary to get it running as an applet or an application:
import java.awt.BorderLayout;
import java.awt.Image;
import java.awt.TextArea;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileInputStream;
import java.io.InputStream;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Module5Assignment2 extends JApplet
{
public void init()
{
try
{
InputStream stream = getClass().getResourceAsStream("sample.jpg");
if (stream == null)
{
System.out.println("Resource not found");
}
else
{
myPicture = ImageIO.read(stream);
icon = new ImageIcon(myPicture);
label = new JLabel(icon);
add(label, BorderLayout.NORTH);
}
}
catch (Exception e)
{
e.printStackTrace();
}
add(bio);
add(bio, BorderLayout.CENTER);
pane.add(play);
getContentPane().add(pane, BorderLayout.SOUTH);
play.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
try
{
FileInputStream FIS = new FileInputStream("sample.mp3");
// player = new Player (FIS);
// player.play();
}
catch (Exception e1)
{
e1.printStackTrace();
}
}
});
}
public static void main(String args[])
{
JFrame frame = new JFrame("");
// ******PRETTY SURE I NEED TO ADD SOMETHING HERE*************
Module5Assignment2 contents = new Module5Assignment2();
frame.getContentPane().add(contents);
contents.init();
// *************************************************************
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.show();
}
private JPanel pane = new JPanel();
private TextArea bio = new TextArea(
"This is the bio of Christian Sprague; he doesn't like typing things.");
private JButton play = new JButton("Play");
private Image myPicture;
private ImageIcon icon;
private JLabel label;
// private Player player;
}
I am trying to make a save button but I don't know how to do it. I will explain a little bit about my program. When someone start the program it shows a JOptionPane and the user need to write a nickname and then when he clicks on OK button it saves his nickname in a text.file. This is a part from my code.
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.*;
import javax.swing.event.*;
public class SummerExamProject extends JFrame {
JButton Exit, About, Question1, Question2, Question3, Question4;
JPanel panel, panel2, panel3, panel4 ;
public SummerExamProject(){
initUI();
}
public void initUI(){
setTitle("Java");
setSize(500, 450);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
JFrame frame = new JFrame();
JFrame frame1 = new JFrame("");
JPanel panel = new JPanel();
JPanel panel2 = new JPanel();
getContentPane().add(panel);
panel.setLayout(new GridLayout(0,3,8,9));
String code = JOptionPane.showInputDialog(frame1, " Enter a nickname ", "Nickname needed", JOptionPane.WARNING_MESSAGE);
If you want to store nickname to file you can use PrintWriter. Lets say you saved the nickname in String variable called nickname:
String nickname = "myAwesomeNickname";
try {
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("c:/nicknames.txt", true)));
out.println(nickname);
out.close();
} catch (IOException e) {
//exception handling
}
PrintStream out = null;
try {
out = new PrintStream(new FileOutputStream("text.txt"));
out.print(code); // your String here
} catch (IOException e) {
} finally {
if (out != null)
out.close();
}
text.txt can also be a full path like new FileOutputStream("D:/folder/text.txt")
There are a few more options to write to files, though.
I am creating a program which allows the user to enter data and then click a button to view said data. On the first frame I want the user to select an item from a ComboBox and when they click a button it takes the selected item from the ComboBox and enters it as a parameter for another method which will bring up data from a file (this method isn't yet complete).
The code I have so far is as follows:
import java.awt.Container;
import java.awt.EventQueue;
import java.awt.List;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.SpringLayout;
public class Main implements ActionListener{
static JButton ViewData = new JButton("View Data");
static JButton AddItem = new JButton("Add Item");
String Item = null;
public static void main(String[]args){
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {
new Main();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
public Main() throws IOException{
//Populating ComboBox
String FilePath = "C:/Users/Harry/AS Computing/CWTreasurers/src/ItemList";
BufferedReader input = new BufferedReader(new FileReader(FilePath));
ArrayList<String> strings = new ArrayList<String>();
try {
String line = null;
while (( line = input.readLine()) != null){
strings.add(line);
}//End While
}//End Try
catch (FileNotFoundException e) {
System.err.println("Error, file " + FilePath + " didn't exist.");
}//End catch
finally {
input.close();
}//end Finally
String[] lineArray = strings.toArray(new String[]{});
JComboBox ChooseItems = new JComboBox(lineArray);
//End populating ComboBox
JFrame frame = new JFrame("CharityWeekTreasury");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
//Sets Default properties of the window
Container ContentPane = frame.getContentPane();
SpringLayout layout = new SpringLayout();
ContentPane.setLayout(layout);
//Defines the container for all objects and the layout
ContentPane.add(ChooseItems);
ContentPane.add(ViewData);
ContentPane.add(AddItem);
ViewData.addActionListener(this);
AddItem.addActionListener(this);
//Adds Objects to window
layout.putConstraint(SpringLayout.WEST,ChooseItems,5,SpringLayout.WEST,ContentPane);
layout.putConstraint(SpringLayout.NORTH,ChooseItems,5,SpringLayout.NORTH,ContentPane);
layout.putConstraint(SpringLayout.WEST,ViewData,5,SpringLayout.EAST,ChooseItems);
layout.putConstraint(SpringLayout.NORTH,ViewData,5,SpringLayout.NORTH,ContentPane);
layout.putConstraint(SpringLayout.WEST,AddItem,5,SpringLayout.EAST,ViewData);
layout.putConstraint(SpringLayout.NORTH,AddItem,5,SpringLayout.NORTH,ContentPane);
layout.putConstraint(SpringLayout.EAST,ContentPane,5,SpringLayout.EAST,AddItem);
layout.putConstraint(SpringLayout.SOUTH,ContentPane,5,SpringLayout.SOUTH,ChooseItems);
//Sets Positioning of objects relative to each other
frame.pack();
frame.setVisible(true);
//Makes frame visible
}//End Window
public void actionPerformed(ActionEvent e) {
JButton b = (JButton)e.getSource();
if(b.equals(ViewData)){
Item = ChooseItems.getSelectedItem();
ViewData view = new ViewData(Item);
}else if(b.equals(AddItem)){
new AddItem();
}
}
}
ViewData is both a button and the name of another class in the project, the main error is that the line
Item = ChooseItems.getSelectedItem();
Doesn't seem to work, I believe this to be due to the positioning of where ChooseItems is declared, this meaning that there is no ChooseItems to get a selected item of.
Any help is much appreciated. Thanks.