I am working on a basic Java Swing UI application, which seems to be working correctly, except for an issue I've noticed when using the form I created.
The problem is when I am typing in the text boxes, holding down a key seems to break the form--ie, after taking this action, the text boxes no longer seem to accept any input. I find it hard to believe this is a released issue with Java Swing components, but I also can't see how it would be related to my code. Has anyone seen a similar issue before? I am using OS x with Intellij IDEA if that is relevant.
My form is defined thusly:
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JTextField;
#SuppressWarnings("serial")
public class LoginDialogMcve extends JFrame {
protected JTextField stringEntry, dateEntry;
public LoginDialogMcve() {
super("Create Textbox");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());
this.stringEntry = new JTextField(5);
add(this.stringEntry);
this.dateEntry = new JTextField(5);
add(this.dateEntry);
}
public static void main(String... args) {
LoginDialogMcve me = new LoginDialogMcve();
me.pack();
me.setLocationByPlatform(true);
me.setVisible(true);
}
}
Edit: Thanks for the feedback, this is quite possibly not a Java problem. Could have something to do with OSx... Uploaded simpler example with mcve
My MCVE that works fine. Test it yourself to see.
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
// import net.miginfocom.swing.MigLayout;
#SuppressWarnings("serial")
public class LoginDialogMcve extends JFrame {
protected JTextField stringEntry, dateEntry;
protected JLabel stringEntryLabel, dateEntryLabel;
protected JButton print;
protected Action validateAction;
public LoginDialogMcve() {
super("Create Textbox");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new FlowLayout());
// setLayout(new MigLayout("ins 10, gap 5",
// "[][grow]",
// "[][][]"));
this.stringEntryLabel = new JLabel("Name:");
add(this.stringEntryLabel);
this.stringEntry = new JTextField(5);
add(this.stringEntry);
this.dateEntryLabel = new JLabel("Date:");
add(this.dateEntryLabel);
this.dateEntry = new JTextField(5);
add(this.dateEntry);
this.validateAction = new MyAction();
this.print = new JButton(this.validateAction);
add(this.print);
getRootPane().getActionMap().put("validate", this.validateAction);
}
public static void main(String... args) {
LoginDialogMcve me = new LoginDialogMcve();
me.pack();
me.setLocationByPlatform(true);
me.setVisible(true);
}
public class MyAction extends AbstractAction {
public MyAction() {
super("Validate");
}
#Override
public void actionPerformed(ActionEvent e) {
// lots of irrelevant code
}
}
}
Related
I want to be able to call the Introduction.Intro() method into my main file code, but it tells me I am unable to call a non-static method intro from a static context. Since I am still fairly new to coding I'm not entirely sure what the problem is. I've added my codes down below. I've tried countless online methods but sadly none have seemed to work.
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Start extends JFrame implements ActionListener
{
private JFrame Main;
private JPanel PanelA, PanelB, PanelC;
private JLabel Text, ImageL;
private JButton Button;
private ImageIcon Image;
public Start ()
{
//Button
Button = new JButton("Start");
Button.addActionListener(new ButtonListener());
//Text
Text = new JLabel("Welcome To The Game"); //ADD NAME OF THE GAME
//Image
Image = new ImageIcon(getClass().getResource("download.jfif")); //ADD THE IMAGE FOR WELCOME
ImageL = new JLabel(Image);
//Top Panel (PanelA) - Image
PanelA = new JPanel();
PanelA.setBorder(BorderFactory.createEmptyBorder(0,200,150,200));
PanelA.setLayout(new FlowLayout(FlowLayout.CENTER));
PanelA.add(ImageL);
//Middle Panel (PanelB) - Text
PanelB = new JPanel();
PanelB.setBorder(BorderFactory.createEmptyBorder(50,200,10,200));
PanelB.setLayout(new FlowLayout(FlowLayout.CENTER));
PanelB.add(Text);
//Bottom Panel (PanelC) - Buttons
PanelC = new JPanel();
PanelC.setBorder(BorderFactory.createEmptyBorder(0,200,20,200));
PanelC.setLayout(new FlowLayout(FlowLayout.CENTER));
PanelC.add(Button);
//Main Frame
Main = new JFrame ();
Main.add(PanelA, BorderLayout.NORTH);
Main.add(PanelB, BorderLayout.CENTER);
Main.add(PanelC, BorderLayout.SOUTH);
Main.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Main.setTitle("GAME TITLE"); //ADD THIS LATER
Main.pack();
Main.setVisible(true);
}
#Override
public void actionPerformed(ActionEvent ae)
{
}
public class ButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == Button)
{
Introduction.Intro1(); //THESE LINE RIGHT HERE
return null; //THESE LINE RIGHT HERE
}
}
}
public static void main(String[] args)
{
new Start();
}
}
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Introduction
{
private JFrame Main;
private JPanel PanelD;
private JLabel Text, ImageL;
private JButton Button;
private ImageIcon Image;
public void Intro()
{
Image = new ImageIcon(getClass().getResource("guy.jfif"));
ImageL = new JLabel(Image);
PanelD = new JPanel();
PanelD.setBorder(BorderFactory.createEmptyBorder(0,100,10,100));
PanelD.setLayout(new FlowLayout(FlowLayout.CENTER));
PanelD.add(ImageL);
PanelD.setVisible(true);
Main.add(PanelD, BorderLayout.NORTH);
}
}
EDIT: So I made another method in the Introduction class where I added this line of code, it managed to fix the error, however, the panel isn't being saved and my JFrame is outputting blank.
public static JFrame Intro1()
{
Introduction M = new Introduction();
return M;
}
If you are looking to initialize the Introduction class in main method of Start class, You can add belo code in main method after Start()
Introduction M = new Introduction();
You main method becomes :
public static void main(String[] args)
{
new Start();
Introduction M = new Introduction();
m.Intro
}
Looking at this set of code, It looks like there is incompatible issue, as you have declare JFrame as return type, while you are returning instance of Introduction.
public static JFrame Intro1()
{
Introduction M = new Introduction();
return M;
}
I'm failing to understand why my yankee and whiskey JButtons aren't working. Right now I only want them to close the program when romeo is greater than 1 and sierra is greater than 1.
import java.awt.*;
import java.lang.*;
import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.*;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.JPanel;
import java.util.Scanner;
public class AlphaMenu extends JFrame /*implements actionPerformed*/
{
private GraphicsDevice gamma;
public JButton charlie, zulu, yankee, xray;
public JFrame beta;
public JPanel delta, echo, foxtrot, golf, hotel;
public JTextArea whiskey, victor;
public BorderLayout uniform;
public ImageIcon bg;
public JLabel tango;
public int sierra, romeo;
public Integer quebec, papa;
public ActionEvent oscar;
public ActionEvent november;
public AlphaMenu()
{
//Initialization of Objects
charlie = new JButton("EXIT");
zulu = new JButton("Enter Time");
yankee = new JButton("Enter Amount of Money");
xray = new JButton("Calculate");
sierra = 0;
romeo = 0;
quebec = new Integer(0);
papa = new Integer(0);
whiskey = new JTextArea(2, 15);
victor = new JTextArea(2, 15);
bg = new ImageIcon("background.gif");
beta = new JFrame();
delta = new JPanel();
echo = new JPanel();
foxtrot = new JPanel();
golf = new JPanel();
hotel = new JPanel();
uniform = new BorderLayout();
ImageIcon bg = new ImageIcon("background.gif");
tango = new JLabel("");
tango.setIcon(bg);
//Modification of panels
beta.add(delta, uniform.PAGE_END);
beta.add(golf, uniform.PAGE_START);
beta.add(echo, uniform.LINE_START);
beta.add(foxtrot, uniform.LINE_END);
beta.add(hotel, uniform.CENTER);
golf.add(tango);
//Modification of JButton charlie & adding of JButtons
charlie.setPreferredSize(new Dimension(100, 50));
delta.add(charlie);
charlie.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
});
echo.add(whiskey);
echo.add(yankee);
foxtrot.add(victor);
foxtrot.add(zulu);
//Modification of JFrame beta
beta.setUndecorated(true);
beta.setExtendedState(JFrame.MAXIMIZED_BOTH);
beta.setResizable(false);
beta.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
beta.setVisible(true);
}
public void buttonSetup() throws NumberFormatException
{
//Modification of JButton yankee & JTextArea whiskey & int sierra
romeo = quebec.parseInt(whiskey.getText());
yankee.setPreferredSize(new Dimension(300, 50));
yankee.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent oscar)
{
System.exit(0);
}
});
//Modification of JButton zulu & JTextArea victor & int romeo
sierra = papa.parseInt(victor.getText());
zulu.setPreferredSize(new Dimension(300, 50));
zulu.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent november)
{
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)
{
}
public static void main(String[] args)
{
new AlphaMenu();
}
}
So, you have two JTextArea (JTextField would probably be better) and a button. you want some buttons to execute exit when the text of both textareas is an integer greater than 1.
seems that your buttonSetup() function isn't called anywhere.
Anyway, I'd create an ActionListener that reads the texts, converts to integer, tests your condition and executes exit(). This ActionListener should be added to all the buttons you want to perform the action
final ActionListener al = new ActionListener() {
public void actionPerformed(ActionEvent event) {
try {
final int intRomeo = Integer.parseInt(romeo.getText());
final int intSierra = Integer.parseInt(sierra .getText());
if (intRomeo > 1 && intSierra > 1) {
// whatever you want to do
System.exit(0);
}
} catch (/*NumberFormat*/ Exception e) {
// ...not integers
}
};
}
whiskey.addActionListener(al);
yankee.addActionListener(al);
I have to add: the variable names you are using are really bad. Consider choosing something more significative.
For starters, readability...it would probably help the "sloppiness" if you used more appropriate names for your variables, indented different sections of code, and used comments to help describe sections in layman's terms. Maybe "btnExit" and "btnCalculate" would help make things a little easier to navigate.
Moving forward, you also don't have two different classes here, you have one class with several methods. Which is fine but wanted to inform you of that. I think maybe you need to add the buttons to their panels after your action listeners and formatting for each button. I'm just getting into some swing stuff myself and I've noticed moving the .add() functions around in the code has helped when I run into issues like this. Try the following bellow. I indented and used new naming conventions for the comments, but the code uses your convention.
//add the pnlEcho to frmBeta
beta.add(echo, uniform.LINE_START);
//format btnYankee
yankee.setPreferredSize(new Dimension(300, 50));
//btnYankee action listener
yankee.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) { //default action event
System.exit(0); //you could use this
beta.dispose(); //or you could dispose the frame and
//do more work after it is gone
}
});
//add btnYankee to pnlEcho
echo.add(yankee);
I'm failing to understand why my yankee and whiskey JButtons aren't
working
The variable wiskey is not JButton type but JTextArea type.
I am learning the basics of Java and decided to practice working on objects, by making a simple program which I called a 'PlayerAction Counter'. It does nothing more that counting an 'action' which is fired by clicking '+1' button and additionally reset the counter, when the 'Reset' button is clicked. For this case I've made a Application.java which holds the main method and launches the program, Interface.java for GUI, EventHandling.java for events and Person.java which holds interface components and methods to change their state. It looks like this:
My idea was to create the window in Interface class and set it's layout, then create two Person objects called PlayerOne and Player Two. The Person class creates two labels and two buttons and set a label of one by a constructor parameter.
I've managed to add these two objects' elements to the GUI by getters and it looks just fine. I added ActionListener to both buttons in Person class and it also works just fine.
I am stuck on getting back to Person fields and methods from EventHandling class. I've created a setValueLabel() which increases by one a value of 'action' and sets it on the label, but I have to idea how to launch the method from another class. I can not make another object inside (throws StackOverFlow error), but should it not somehow refer to those two made in Interface class?
Here is the code:
Application.java
import java.awt.EventQueue;
public class Application {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
new Interface().setVisible(true);
}
});
}
}
Interface.java
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import javax.swing.SwingConstants;
public class Interface extends JFrame {
private JLabel titleLabel;
private JPanel mainPanel;
private JPanel leftPanel, rightPanel;
private JSeparator separator;
Person PlayerOne = new Person("PlayerOne");
Person PlayerTwo = new Person("PlayerTwo");
public Interface() {
//Basic init
setTitle("PlayerAction Counter");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
//Layout
mainPanel = new JPanel();
add(mainPanel);
mainPanel.setLayout(new BorderLayout());
mainPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
leftPanel = new JPanel();
rightPanel = new JPanel();
leftPanel.setLayout(new BoxLayout(leftPanel, BoxLayout.Y_AXIS));
leftPanel.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
mainPanel.add(leftPanel, BorderLayout.WEST);
separator = new JSeparator(SwingConstants.VERTICAL);
mainPanel.add(separator, BorderLayout.CENTER);
titleLabel = new JLabel("PlayerAction Counter");
mainPanel.add(titleLabel, BorderLayout.PAGE_START);
//Components init
PlayerTwo.getPersonLabel().setAlignmentX(Component.CENTER_ALIGNMENT);
leftPanel.add(PlayerTwo.getPersonLabel());
PlayerTwo.getValueLabel().setAlignmentX(Component.CENTER_ALIGNMENT);
leftPanel.add(PlayerTwo.getValueLabel());
PlayerTwo.getValueUpButton().setAlignmentX(Component.CENTER_ALIGNMENT);
leftPanel.add(PlayerTwo.getValueUpButton());
PlayerTwo.getValueResetButton().setAlignmentX(Component.CENTER_ALIGNMENT);
leftPanel.add(PlayerTwo.getValueResetButton());
rightPanel.setLayout(new BoxLayout(rightPanel, BoxLayout.Y_AXIS));
rightPanel.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
mainPanel.add(rightPanel, BorderLayout.EAST);
PlayerOne.getPersonLabel().setAlignmentX(Component.CENTER_ALIGNMENT);
rightPanel.add(PlayerOne.getPersonLabel());
PlayerOne.getValueLabel().setAlignmentX(Component.CENTER_ALIGNMENT);
rightPanel.add(PlayerOne.getValueLabel());
PlayerOne.getValueUpButton().setAlignmentX(Component.CENTER_ALIGNMENT);
rightPanel.add(PlayerOne.getValueUpButton());
PlayerOne.getValueResetButton().setAlignmentX(Component.CENTER_ALIGNMENT);
rightPanel.add(PlayerOne.getValueResetButton());
pack();
}
}
Person.java
import java.awt.Component;
import javax.swing.JButton;
import javax.swing.JLabel;
public class Person {
private JLabel personLabel;
private JLabel valueLabel;
private JButton valueUpButton;
private JButton valueResetButton;
private int actionValue = 0;
public Person(String s) {
personLabel = new JLabel(s);
setComponents();
}
private void setComponents() {
valueUpButton = new JButton("+1");
valueResetButton = new JButton("Reset");
valueLabel = new JLabel(""+actionValue);
EventHandling eventHand = new EventHandling(valueUpButton, valueResetButton);
valueResetButton.addActionListener(eventHand);
valueUpButton.addActionListener(eventHand);
}
public void setValueLabel() {
actionValue++;
valueLabel.setText("" +actionValue);
}
public JLabel getPersonLabel() {
return personLabel;
}
public JLabel getValueLabel() {
return valueLabel;
}
public JButton getValueUpButton() {
return valueUpButton;
}
public JButton getValueResetButton() {
return valueResetButton;
}
}
EventHandling.java
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JLabel;
public class EventHandling implements ActionListener {
private JButton valueUpButton;
private JButton valueResetButton;
public EventHandling(JButton valueUpButton, JButton valueResetButton) {
this.valueUpButton = valueUpButton;
this.valueResetButton = valueResetButton;
}
#Override
public void actionPerformed(ActionEvent event) {
if (event.getSource() == valueUpButton) {
//no idea how to launch Person.setValueLabel();
//creating new Person object throws StackOverFlow error and I doubt that's the way
}
else if (event.getSource() == valueResetButton) {
}
}
}
I do hope my issue is understandable. The question is: how should it be done?
Please keep in mind that I am a complete rookie and try to learn OOP, but am very confused by it. Please point my mistakes in thinking and the code.
Any feedback will be greatly appraciated.
Thank you.
i wanted to make a java program for getting keystrokes without focusing and without keyevent class object for my project ..
is there any way to do so..??
i tried this but it is not fulfilling my requirements!!
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
import javax.swing.text.Keymap;
public class key1 {
private static void showUI() {
JFrame jFrame = new JFrame("");
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container container = jFrame.getContentPane();
JTextField txt = new JTextField();
container.add(txt, BorderLayout.NORTH);
ActionListener actListener = new ActionListener() {
#Override
public void actionPerformed(ActionEvent event) {
System.out.println(event.getActionCommand() + " selected");
}
};
JPanel jPane = new JPanel();
JButton defaultButton = new JButton("Hit Enter");
defaultButton.addActionListener(actListener);
jPane.add(defaultButton);
JButton otherButton = new JButton("Onother Button");
otherButton.addActionListener(actListener);
jPane.add(otherButton);
container.add(jPane, BorderLayout.SOUTH);
Keymap map = txt.getKeymap();
KeyStroke stroke = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, false);
map.removeKeyStrokeBinding(stroke);
jFrame.getRootPane().setDefaultButton(defaultButton);
jFrame.setSize(350, 250);
jFrame.setVisible(true);
}
public static void main(String args[]) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
showUI();
}
});
}
}
I don't believe this is possible at the Swing level..the entire KeyEvent API revolves around some Component having focus :(
In fact, I'm pretty sure the JVM only generates events based on what the OS gives to it..and you can only get those events if something is in focus.
However, I've found a library that might do what you want. I have never used it though..just looked up out of curiosity:
http://code.google.com/p/jnativehook/
I'm new to java programming and currently enrolled in a 2week class. I'd like to ask is it possible to separate acionlistener from the gui class? I'd like to apply mvc while I'm still learning but have no idea on how to start with and how should I do it.
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;
public class WriteFile extends JFrame implements ActionListener{
JTextArea textBox;
JButton convert;
WriteFile(){
//windows
setDefaultCloseOperation(javax.swing.WindowConstants.HIDE_ON_CLOSE);
setVisible(true);
setSize(300, 300);
setLocationRelativeTo(null);
//others
textBox = new JTextArea("Type something here", 5, 15);
convert = new JButton("Display");
//layout
add(textBox, BorderLayout.CENTER);
add(convert, BorderLayout.LINE_END);
//actionlistener
convert.addActionListener(this);
}
#Override
public void actionPerformed(ActionEvent event) {
String output = "";
output = textBox.getText();
JOptionPane.showMessageDialog(null, output);
}
}
and here is my main:
import java.awt.BorderLayout;
public class main {
public static void main(String[] args) {
WriteFile wc = new WriteFile();
wc.pack();
}
}
I would take a look at the Action API.
It allows you to define a "Action" and it's properties independently of the UI.
It's a very powerful concept as it allows you to centralise commonly used actions in a independent way that allows them to be reused.
Have a look at How to use Actions for more information.
yes just make another class that implements ActionListener outside the gui class
public class MyActionListener implements ActionListener{
public void actionPerformed(ActionEvent event) {
JOptionPane.showMessageDialog(null, ((JTextArea) event.getSource()).getText() );
}