I want to add JCombobox to the panel at run time, I don't have idea about this, so please if you have any idea about this suggest me.
I assume you want to add a combo box to a component that is already on screen. Just add the component to the appropriate Container and call the Container's validate method. Here is a little example for this:
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Application {
private static final String[] choices = { "One", "Two", "Three" };
/**
* #param args
*/
public static void main(String[] args) {
JFrame frame = new JFrame();
final JPanel content = new JPanel();
content.setPreferredSize(new Dimension(50, 200));
content.setLayout(new BoxLayout(content, BoxLayout.Y_AXIS));
JButton addButton = new JButton(new AbstractAction("Add Combobox") {
private static final long serialVersionUID = 1L;
#Override
public void actionPerformed(ActionEvent arg0) {
content.add(new JComboBox(choices));
content.validate();
}
});
frame.add(content);
content.add(addButton);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
Although I have used a frame only for this example, it should also work for a JPanel.
Related
list is to accept input from Action1 this works, however, whenever a new element is added to the list, the list's position moves back to the default top-middle position.
This also occurs when the frame is resized, so as a temporary fix I the line frame.setResizable(false) but I do not want that to be permanent.
How would I fix both of these issues?
import static java.lang.String.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionListener;
public class lists
{
static String newUrl;
static DefaultListModel<String> model = new DefaultListModel<String>();
static int listXCoord = 650;
static int listYCoord = 10;
public static void createGUI()
{
JFrame frame = new JFrame();
frame.setVisible(true);
frame.setSize(800,600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
JPanel panel = new JPanel();
frame.add(panel);
JButton addurl = new JButton("Add URL");
panel.add(addurl);
addurl.addActionListener(new Action1());
JButton remurl = new JButton("Remove URL");
panel.add(remurl);
//model.addElement("one");
//model.addElement("two");
//model.addElement("three");
JList list = new JList<String>(model);
list.setCellRenderer(new DefaultListCellRenderer());
list.setVisible(true);
list.setLocation(listXCoord, listYCoord);
list.setBackground(new Color(186, 203, 250));
//list.setLocation(650, 10);
panel.add(list);
list.setSize(130, 540);
}
static class Action1 implements ActionListener
{
public void actionPerformed (ActionEvent e)
{
newUrl = JOptionPane.showInputDialog("Enter the URL to be Launched");
model.addElement(newUrl);
}
}
public static void main(String[] args)
{
createGUI();
}
}
Basically, you're fighting the layout manager (Flowlayout) and losing. When you add a new element to the JList, the container hierarchy is been revalidated which is causing the layout managers to re-layout the contents of their containers
The basic solution would be to use a different layout, but, JFrame uses a BorderLayout, so instead of adding the JList to the JPanel, you could simply add it to the EAST position of the frame instead
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultListCellRenderer;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Lists {
static String newUrl;
static DefaultListModel<String> model = new DefaultListModel<String>();
static int listXCoord = 650;
static int listYCoord = 10;
public static void createGUI() {
JFrame frame = new JFrame();
frame.setSize(800, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
frame.add(panel);
JButton addurl = new JButton("Add URL");
panel.add(addurl);
addurl.addActionListener(new Action1());
JButton remurl = new JButton("Remove URL");
panel.add(remurl);
//model.addElement("one");
//model.addElement("two");
//model.addElement("three");
JList list = new JList<String>(model);
list.setCellRenderer(new DefaultListCellRenderer());
list.setVisible(true);
list.setLocation(listXCoord, listYCoord);
list.setBackground(new Color(186, 203, 250));
//list.setLocation(650, 10);
frame.add(new JScrollPane(list), BorderLayout.EAST);
frame.setVisible(true);
}
static class Action1 implements ActionListener {
public void actionPerformed(ActionEvent e) {
newUrl = JOptionPane.showInputDialog("Enter the URL to be Launched");
model.addElement(newUrl);
}
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
createGUI();
}
});
}
}
See Laying Out Components Within a Container, How to Use BorderLayout and How to use FlowLayout for more details.
You should also be calling setVisible last, after all the components have been added to the frame, this reduces the possibilities that some of your components won't be displayed when you think they should be.
JList will also benefit from been contained within a JScrollPane. See How to Use Lists and How to Use Scroll Panes for more details
I want to put value in txtf1 at output screen and get it. How can we put value on text field on output screen?
import java.awt.Color;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
public class demog extends JPanel implements ActionListener{
private TextField textf, txtf1;
public void jhand(){
textf = new TextField();
textf.setSize(40, 40);
textf.setText("20");
textf.setEditable(false);
textf.setBackground(Color.WHITE);
textf.setForeground(Color.BLACK);
//textf.setHorizontalAlignment(SwingConstants.CENTER);
textf.setLocation(15, 15);
//textf.addActionListener(this);
txtf1 = new TextField();
txtf1.setSize(40, 40);
txtf1.getText();
txtf1.setEditable(false);
txtf1.setBackground(Color.WHITE);
txtf1.setForeground(Color.BLACK);
//txtf1.setHorizontalAlignment(SwingConstants.CENTER);
txtf1.setLocation(50, 50);
JFrame frame = new JFrame("demo");
JPanel p = new JPanel();
p.setOpaque(true);
p.setBackground(Color.WHITE);
p.setLayout(null);
frame.setContentPane(p);
frame.setSize(500,500);
frame.setVisible(true);
p.add(textf);
p.add(txtf1);
}
public void actionPerformed(ActionEvent evt) {
String text = textf.getText();
System.out.println(text);
}
public static void main(String... args){
demog g = new demog();
g.jhand();
}
}
You have to change some of your code in order to work. You had some problem in your code which I resolved them for you in the following code. See the comments to learn some in swing ;-)
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
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.JPanel;
import javax.swing.JTextField;
import javax.swing.WindowConstants;
// Use upper Case in the start of you class names:
public class Demog extends JPanel implements ActionListener {
private JTextField textf, txtf1;
public Demog() {
jhand();
}
public void jhand() {
setLayout(new FlowLayout()); // Always set the layout before you add components
// you can use null layout, but you have to use setBounds() method
// for placing the components. For an advanced layout see the
// tutorials for GridBagLayout and mixing layouts with each other.
textf = new JTextField(); // Do not mix AWT component with
// Swing (J components. See the packages)
//textf.setSize(40, 40); // Use setPreferredSize instead
textf.setPreferredSize(new Dimension(40, 40));
textf.setText("20");
textf.setEditable(false); // Text fields are for getting data from user
// If you need to show something to user
// use JLabel instead.
textf.setBackground(Color.WHITE);
textf.setForeground(Color.BLACK);
add(textf);
txtf1 = new JTextField();
//txtf1.setSize(40, 40); Use setPreferredSize instead
txtf1.setPreferredSize(new Dimension(40, 40));
txtf1.getText();
txtf1.setEditable(false);
txtf1.setBackground(Color.WHITE);
txtf1.setForeground(Color.BLACK);
add(txtf1);
JButton b = new JButton("Click ME!");
b.addActionListener(this);
add(b);
}
public void actionPerformed(ActionEvent evt) {
String text = textf.getText();
JOptionPane.showMessageDialog(Demog.this, "\"textf\" text is: "+text);
}
public static void main(String[] args) {
JFrame frame = new JFrame("demo");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
Demog p = new Demog();
p.setBackground(Color.WHITE);
frame.setContentPane(p);
frame.setSize(500, 500);
frame.setVisible(true);
}
}
Good Luck.
How to create a game menu with three interfaces,1st interface has two option exit and continue,choose team and continue or back,3rd playing interface
package SimpleSoccer;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuBar;
import javax.swing.JPanel;
/** * * #author Andyblem */ public class TopLevelDemo {
static JButton startButton = new JButton("START");
static JButton exitButton = new JButton("EXIT");
static JButton backButton = new JButton("MENU");
static JPanel panel = new JPanel(new FlowLayout());
static JFrame frame;
private static void createAndShowGUI(){
frame = new JFrame("Top Level Demo");
frame.setSize(400,400);
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar cyanMenuBar = new JMenuBar();
cyanMenuBar.setOpaque(true);
cyanMenuBar.setBackground(Color.cyan);
cyanMenuBar.setPreferredSize(new Dimension(200,180));
JLabel yellowLabel = new JLabel();
yellowLabel.setOpaque(true);
yellowLabel.setBackground(Color.yellow);
yellowLabel.setPreferredSize(new Dimension(200,20));
frame.setJMenuBar(cyanMenuBar);
frame.getContentPane().add(panel);
panel.add(startButton);
panel.add(exitButton);
// frame.getContentPane().add(exitButton);
frame.pack();
frame.setVisible(true);
}
public static void main(String args[]){
createAndShowGUI();
}
}
Your "question" (if you could even call it that) is kind of unclear. Seems like you just don't know where to begin. So I'll give you a tip.
What I would do is:
Use a CardLayout. What the layout does is "layer" panels, making them navigable with methods like show(pickAPanelToShow), next(nextPanel), and previous(previousPanel).
What you can do is on first page have a the two buttons, if continue is pressed, then the next() method can take you to the chooseTeamPanel. And from that panel you can navigate to the gamePanel after the team is chosen.
You can see more at How to use CardLayout and you can see an example here
I have a MainPanel which uses the Gridlayout. Consequently I have created four JPanel classes for the: NORTH, EAST, CENTER and EAST layouts respectively. I then add all four to my MainPanel.
However, on my WEST panel I use another grid layout to store JButtons and JTextFields. I want to constantly update my JTextFields as they display a value (that changes when a button on another panel is clicked). How do I allow that value to be changed when the JFrame is running?
I tried using paintComponent, but it keeps on adding multiple copies of the same JTextField after each other, as I add it in my paintComponent method. If I remove the add method the values won't update.
Action works well to encapsulate such functionality. In the example below, a number of text fields listen for an ActionEvent received from a single Update button. The common UpdateHandler is derived from AbstractAction.
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
/** #see http://stackoverflow.com/a/14947144/230513 */
public class Test {
private JButton button = new JButton("Update");
private void display() {
JFrame f = new JFrame("Test");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(createPanel(button), BorderLayout.NORTH);
f.add(createPanel(button), BorderLayout.WEST);
f.add(createPanel(button), BorderLayout.EAST);
f.add(createPanel(button), BorderLayout.SOUTH);
JPanel p = new JPanel();
p.add(button);
f.add(p, BorderLayout.CENTER);
f.getRootPane().setDefaultButton(button);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
private static JPanel createPanel(JButton b) {
JPanel panel = new JPanel(new FlowLayout(FlowLayout.CENTER));
final JTextField text = new JTextField();
b.addActionListener(new UpdateHandler(text));
panel.add(text);
return panel;
}
private static class UpdateHandler extends AbstractAction {
private JTextField text;
private DateFormat df = new SimpleDateFormat("HH:mm:ss.SSS");
public UpdateHandler(JTextField t) {
super("update");
t.setText(df.format(new Date()));
this.text = t;
}
#Override
public void actionPerformed(ActionEvent e) {
text.setText(df.format(new Date()));
}
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
new Test().display();
}
});
}
}
I'm fairly new to GUI. I'm trying to make it so that depending on which radio button is selected, a JLabel changes its value. For example, if "id" is selected, it'll display "http://steamcommunity.com/id/" and if "profile" is selected, it'll display "http://steamcommunity.com/profiles/". I have some code up and running and it's nearly complete:
package sgt;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
public class RadioButtonPrompt extends JPanel
implements ActionListener {
private static final long serialVersionUID = 1L;
static String idString = "ID";
static String profileString ="Profile";
static String type = idString;
public RadioButtonPrompt() {
super(new BorderLayout());
// Create radio buttons.
JRadioButton idButton = new JRadioButton(idString, true);
idButton.setMnemonic(KeyEvent.VK_I);
idButton.setActionCommand(idString);
JRadioButton profileButton = new JRadioButton(profileString);
profileButton.setMnemonic(KeyEvent.VK_P);
profileButton.setActionCommand(profileString);
// Group radio buttons.
ButtonGroup group = new ButtonGroup();
group.add(idButton);
group.add(profileButton);
idButton.addActionListener(this);
profileButton.addActionListener(this);
JPanel radioPanel = new JPanel(new GridLayout(0, 1));
radioPanel.add(idButton);
radioPanel.add(profileButton);
JPanel textPanel = new JPanel ();
JLabel URL = new JLabel(setJLabelValue());
JTextField text = new JTextField("sampletextfield");
text.setPreferredSize(new Dimension(100, 20));
textPanel.add(URL);
textPanel.add(text);
JPanel buttonPanel = new JPanel(new GridLayout(1, 0));
JButton submit = new JButton("Submit");
submit.setMnemonic(KeyEvent.VK_S);
buttonPanel.add(submit);
add(radioPanel, BorderLayout.LINE_START);
add(textPanel, BorderLayout.CENTER);
add(buttonPanel, BorderLayout.PAGE_END);
setBorder(BorderFactory.createCompoundBorder());
}
private String setJLabelValue() {
if (type.equals("ID")) {
return "http://steamcommunity.com/id/";
}
return "http://steamcommunity.com/profiles/";
}
public void actionPerformed(ActionEvent e) {
// Returns either "Profile" or "ID"
type = ((JRadioButton)e.getSource()).getText();
System.out.println(type);
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("Steam Game Tracker");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JComponent newContentPane = new RadioButtonPrompt();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
// Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
Take a look at this SO thread.
in actionPerformed() you need to textpanel.setText() to whatever you want based on which button was clicked. I'm guessing at the method name, haven't done any UI stuff with Java for a while.