Basically, i am trying to make it so there are 3 buttons on the bottom of the screen and then have a label which has words in it in the middle of the screen. However, i cant seem to have both buttons and the label in the GUI at the same time. I am a beginner and dont know much about layouts (even though i have read into them) so any help/guidance would be helpful on why i cannot see both the label and the buttons.enter code here
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;
public class AWorldPanel implements ActionListener {
/** Declaring all the menu items within the GUI **/
private JMenuItem Fileitem1 = new JMenuItem("New configuration");
private JMenuItem Fileitem2 = new JMenuItem("Open configuration file ");
private JMenuItem Fileitem3 = new JMenuItem("Save");
private JMenuItem Fileitem4 = new JMenuItem("Save As");
private JMenuItem Fileitem5 = new JMenuItem("Exit");
private JMenuItem Viewitem1 = new JMenuItem("Display configuration");
private JMenuItem Viewitem2 = new JMenuItem("Edit configuration");
private JMenuItem Viewitem3 = new JMenuItem("Info about Bugs");
private JMenuItem Viewitem4 = new JMenuItem("Info about Map");
private JMenuItem Edititem1 = new JMenuItem("Remove");
private JMenuItem Edititem2 = new JMenuItem("Add");
private JMenuItem Simulationitem1 = new JMenuItem("Simulation");
private JMenuItem Helpitem1 = new JMenuItem("Info about application");
private JMenuItem Helpitem2 = new JMenuItem("Info about author");
private JLabel theLabel;
private JPanel thePanel;
JButton Run, Pause, Reset;
JFrame GUI = new JFrame("Graphical User Interface");
private static AWorld guiworld;
public AWorldPanel() {
/** Creating the menu **/
JMenuBar menubar = new JMenuBar();
JMenu File = new JMenu("File");
JMenu View = new JMenu("View");
JMenu Edit = new JMenu("Edit");
JMenu Help = new JMenu("Help");
/** welcome label **/
theLabel = new JLabel("Hello ", JLabel.CENTER);
theLabel.setVisible(true);
theLabel.setVerticalTextPosition(JLabel.TOP);
theLabel.setHorizontalTextPosition(JLabel.CENTER);
/** file sub menus **/
menubar.add(File);
File.add(Fileitem1);
File.add(Fileitem2);
File.add(Fileitem3);
File.add(Fileitem4);
File.add(Fileitem5);
menubar.add(View);
View.add(Viewitem1);
View.add(Viewitem2);
View.add(Viewitem3);
View.add(Viewitem4);
menubar.add(Edit);
Edit.add(Edititem1);
Edit.add(Edititem2);
menubar.add(Help);
Help.add(Helpitem1);
Help.add(Helpitem2);
JPanel panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
panel.setBorder(new EmptyBorder(new Insets(300, 125, 100, 100)));
Run = new JButton("Run");
Pause = new JButton("Pause");
Reset = new JButton("Reset");
panel.add(Run);
panel.add(Box.createRigidArea(new Dimension(0, 5)));
panel.add(Pause);
panel.add(Box.createRigidArea(new Dimension(0, 5)));
panel.add(Reset);
GUI.add(panel);
GUI.add(theLabel);
GUI.setJMenuBar(menubar);
}
private static void createAndShowGUI() {
AWorldPanel newworld = new AWorldPanel();
// Create the container
JFrame frame = new JFrame("Graphical User Interface");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// changing the menu settings
newworld.GUI.setLocation(300, 100);
newworld.GUI.setSize(500, 500);
newworld.GUI.setVisible(true);// Now the frame will appear on screen
}
public static void main(String args[]) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
The default layout manager for a JFrame is a BorderLayout. If you don't specify a constraint then the component will be added to the BorderLayout.CENTER. You can't add multiple components to the same location in the layout. Try something like:
GUI.add(panel, BorderLayout.SOUTH);
GUI.add(theLabel, BorderLayout.CENTER);
Also, learn standard Java naming conventions. Every book, tutorial or example you will read uses these standards so don't make up your own conventions. Variable names do not start with an upper case character.
Related
Hi everyone ,i`m beginner in programmation and i wanted to make a text editor interface by using java Eclipse and i get problem each time i add scrollbar , the text area disappear ... How can i fix my code to continue on it ?... i saw many tutorials but nothing work>
import java.awt.*;
import java.awt.color.*;
import javax.swing.*;
public class Fenetre extends JFrame {
JMenuBar Menubar = new JMenuBar();
JMenu MenuFichier = new JMenu("Fichier");
JMenuItem MenuFichier1 = new JMenuItem("Nouveau");
JMenuItem MenuFichier2 = new JMenuItem("Ouvrir");
JMenuItem MenuFichier3 = new JMenuItem("Enregister");
JMenuItem MenuFichier4 = new JMenuItem("Enregister sous");
JMenuItem MenuFichier5 = new JMenuItem("Quitter");
JMenu MenuEdition = new JMenu("Edition");
JMenuItem MenuEdition1 = new JMenuItem("Couper");
JMenuItem MenuEdition2 = new JMenuItem("Copier");
JMenuItem MenuEdition3 = new JMenuItem("Coller");
JMenu MenuAide = new JMenu("Aide");
JMenuItem MenuAide1 = new JMenuItem("A propos");
JPanel p=new JPanel();
JScrollPane sp = new JScrollPane ();
JTextArea jt = new JTextArea (90,90);
public Fenetre() {
add(p);
setTitle("Text Editor");
setBounds(100,100, 500, 500);
//setExtendedState(JFrame.MAXIMIZED_BOTH);
sp.add(jt);
jt.setText(null);
jt.setLineWrap(true);
jt.setWrapStyleWord(true);
jt.setVisible(true);
sp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
sp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
p.add(sp);
sp.setVisible(true);
Menubar.add(MenuFichier);
Menubar.add(MenuEdition);
Menubar.add(MenuAide);
MenuFichier.add(MenuFichier1);
MenuFichier.add(MenuFichier2);
MenuFichier.addSeparator();
MenuFichier.add(MenuFichier3);
MenuFichier.add(MenuFichier4);
MenuFichier.addSeparator();
MenuFichier.add(MenuFichier5);
MenuEdition.add(MenuEdition1);
MenuEdition.add(MenuEdition2);
MenuAide.add(MenuAide1);
Menubar.setBackground(Color.PINK);
getContentPane().add(sp);
setJMenuBar(Menubar);
setVisible(true);
setAlwaysOnTop(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}}
and this is the main of the code
import java.awt.*;
import javax.swing.*;
import java.awt.Color;
public class CreationEditor {
public static void main(String[] args) {
JFrame f = new Fenetre();
}
}
Q1: MY JTextFeild and JMenuBar does not show up, and I don't know why
there is an picture of the program.
Q2: I have seen a lot of ways to write a program of interface, I don't know which way is better. Is this way or this way: https://www.youtube.com/watch?v=706Ye4ubtEY
import javax.swing.*;
import java.awt.*;
import javax.swing.JTextField;
import javax.swing.JMenuBar;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Real_Interface extends JFrame implements ActionListener {
public Real_Interface(){
JFrame window = new JFrame();
window.add(new JLabel("Rocket Data Visualization Tool"));
window.setTitle("Rocket Data Visualization Tool");
window.setSize(640, 480);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setLocationRelativeTo(null);
window.setVisible(true);
window.setResizable(false);
JTextField tf = new JTextField();
tf.setText("New Text");
String str = tf.getText();
tf.setVisible(true);
JMenuBar bar = new JMenuBar();
JMenu file = new JMenu("File");
JMenuItem menuItem = new JMenuItem("haha");
JMenuItem menuItem2 = new JMenuItem("haha2");
file.add(menuItem);
file.addSeparator();
file.add(menuItem2);
bar.add(file);
JButton button = new JButton("OK");
window.add(button);
button.setBounds(250, 400, 150, 40);
button.addActionListener(this);
}
public static void main(String[] args){
new Real_Interface();
}
public void actionPerformed(ActionEvent e) {
System.out.println("The Button Works!");
Plot.main(null);
}
}
A few reasons
The menubar has not been assigned to the frame
window.setJMenuBar(bar);
The textfield has not been added
window.add(textfield, BorderLayout.PAGE_START);
This component is visible by default so calling setVisible is unnecessary.
The frame needs to be made visible after all components have been added to the frame rather than beforehand
window.setVisible(true);
Your JTextField tf and JMenuBar bar aren't added to their parent (the window ?).
So, I would like my items to be positioned in the format below; I'm really not confident with positioning but would like to learn it a bit more. Here is the code as of yet:
package com.bleh.harry;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Main
{
private JMenuBar menuBar;
private JMenu fileMenu, windowMenu, helpMenu;
private JMenuItem fileNew, fileOpen, fileSave, windowTheme, windowLayout, windowProperties, helpWelcome, helpHelp, helpAbout;
private JTextArea mainTextArea;
public
Main()
{
JPanel mainCard = new JPanel(new BorderLayout(8,8));
JPanel mainTop = new JPanel(new FlowLayout(FlowLayout.CENTER));
menuBar = new JMenuBar();
fileMenu = new JMenu("File");
windowMenu = new JMenu("Window");
helpMenu = new JMenu("Help");
menuBar.add(fileMenu);
menuBar.add(windowMenu);
menuBar.add(helpMenu);
final CardLayout layout = new CardLayout(); //ADDS CARDS TO CONTAINER
final JPanel cards = new JPanel(layout);
cards.add(mainCard, "2");
mainCard.add(mainTop, BorderLayout.NORTH);
JFrame window = new JFrame("Pseudo code text editor");
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.getContentPane().add(cards);
window.setSize(1280, 720);
window.setLocationRelativeTo(null);
window.setVisible(true);
}
public static void main(String args[])
{
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new Main();
}
});
}
}
You could use a BorderLayout...
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class LayoutTest {
private JMenuBar menuBar;
private JMenu fileMenu, windowMenu, helpMenu;
private JMenuItem fileNew, fileOpen, fileSave, windowTheme, windowLayout, windowProperties, helpWelcome, helpHelp, helpAbout;
private JTextArea mainTextArea;
public LayoutTest() {
JPanel mainCard = new JPanel(new BorderLayout(8, 8));
menuBar = new JMenuBar();
fileMenu = new JMenu("File");
windowMenu = new JMenu("Window");
helpMenu = new JMenu("Help");
menuBar.add(fileMenu);
menuBar.add(windowMenu);
menuBar.add(helpMenu);
final CardLayout layout = new CardLayout();
final JPanel cards = new JPanel(layout);
cards.add(mainCard, "2");
JTabbedPane tabbedPane = new JTabbedPane();
tabbedPane.add("One", createPane());
tabbedPane.add("Two", createPane());
tabbedPane.add("Three", createPane());
tabbedPane.add("Four", createPane());
mainTextArea = new JTextArea(20, 40);
mainCard.add(tabbedPane, BorderLayout.WEST);
mainCard.add(new JScrollPane(mainTextArea));
JFrame window = new JFrame("Pseudo code text editor");
window.setJMenuBar(menuBar);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.getContentPane().add(cards);
window.pack();
window.setLocationRelativeTo(null);
window.setVisible(true);
}
protected JPanel createPane() {
return new JPanel() {
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
};
}
public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new LayoutTest();
}
});
}
}
The problem here, is the amount of space that the JTabbedPane wants is depended on it's content...
You could even try using a GridBagLayout which might give you a little more control...
import java.awt.CardLayout;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class LayoutTest {
private JMenuBar menuBar;
private JMenu fileMenu, windowMenu, helpMenu;
private JMenuItem fileNew, fileOpen, fileSave, windowTheme, windowLayout, windowProperties, helpWelcome, helpHelp, helpAbout;
private JTextArea mainTextArea;
public LayoutTest() {
JPanel mainCard = new JPanel(new GridBagLayout());
menuBar = new JMenuBar();
fileMenu = new JMenu("File");
windowMenu = new JMenu("Window");
helpMenu = new JMenu("Help");
menuBar.add(fileMenu);
menuBar.add(windowMenu);
menuBar.add(helpMenu);
final CardLayout layout = new CardLayout(); //ADDS CARDS TO CONTAINER
final JPanel cards = new JPanel(layout);
cards.add(mainCard, "2");
JTabbedPane tabbedPane = new JTabbedPane();
tabbedPane.add("One", createPane());
tabbedPane.add("Two", createPane());
tabbedPane.add("Three", createPane());
tabbedPane.add("Four", createPane());
mainTextArea = new JTextArea(20, 40);
GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = GridBagConstraints.BOTH;
gbc.weightx = 0.25;
gbc.weighty = 1;
mainCard.add(tabbedPane, gbc);
gbc.weightx = 0.75;
mainCard.add(new JScrollPane(mainTextArea), gbc);
JFrame window = new JFrame("Pseudo code text editor");
window.setJMenuBar(menuBar);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.getContentPane().add(cards);
window.pack();
window.setLocationRelativeTo(null);
window.setVisible(true);
}
protected JPanel createPane() {
return new JPanel() {
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
};
}
public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new LayoutTest();
}
});
}
}
Just remember, the JMenuBar belongs to the window ;)
To lay components out next to each other, I'd recommend using a BoxLayout. A BoxLayout takes an orientation parameter and lays components out accordingly. The two most used options are X_AXIS and Y_AXIS. X_AXIS lays things out left to right while Y_AXIS lays things out top to bottom. You want X_AXIS.
To set the layout with a BoxLayout using an instance of JFrame named window, do:
window.setLayout(new BoxLayout(window, BoxLayout.X_AXIS));
Edit - #Heuster linked another question that answers this.
I just found out about WindowBuilder and I'm making a simple chat client using it to teach myself. Right now I've got the basic chat frame done, but only some of the components that I've added are accessible in the code. Specifically, I can't access my input JTextArea, taInput. Is there something I need to do to be able to reference it (to get the text in it for sending, etc.)?
Here's a picture of the Design view:
And here's a the generated code:
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ScrollPaneConstants;
import javax.swing.border.EmptyBorder;
public class frame extends JFrame
{
private JPanel contentPane;
private JButton btnSend;
private JTextArea taDisplay;
/**
* Launch the application.
*/
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
try
{
frame frame = new frame();
frame.setVisible(true);
}
catch (Exception e)
{
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public frame()
{
setResizable(false);
setTitle("Client");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 440, 316);
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);
JMenu mnFile = new JMenu("File");
menuBar.add(mnFile);
JMenuItem mntmConnect = new JMenuItem("Connect...");
mnFile.add(mntmConnect);
JMenuItem mntmSaveChatLog = new JMenuItem("Save chat log...");
mnFile.add(mntmSaveChatLog);
JMenuItem mntmSettings = new JMenuItem("Settings...");
mnFile.add(mntmSettings);
JMenuItem mntmClose = new JMenuItem("Close");
mnFile.add(mntmClose);
JMenu mnEdit = new JMenu("Edit");
menuBar.add(mnEdit);
JMenu mnView = new JMenu("View");
menuBar.add(mnView);
JMenu mnHelp = new JMenu("Help");
menuBar.add(mnHelp);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JPanel panel = new JPanel();
contentPane.add(panel, BorderLayout.CENTER);
panel.setLayout(null);
btnSend = new JButton("Send");
btnSend.addMouseListener(new MouseAdapter()
{
#Override
public void mouseClicked(MouseEvent arg0)
{
taDisplay.append("Send clicked.\n");
}
});
btnSend.setBounds(314, 197, 100, 50);
panel.add(btnSend);
taDisplay = new JTextArea();
taDisplay.setLineWrap(true);
taDisplay.setEditable(false);
taDisplay.setBounds(10, 11, 404, 180);
panel.add(taDisplay);
JScrollPane spInput = new JScrollPane();
spInput.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
spInput.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
spInput.setBounds(10, 197, 294, 49);
panel.add(spInput);
JTextArea taInput = new JTextArea();
taInput.setLineWrap(true);
spInput.setViewportView(taInput);
}
}
From the design tab you could right click on the item (taInput) then click rename on the context menu, in the diaog, at the right of the name there where 2 buttons, clic on the (f) button (field) and then ok.
I have code that displays a menu and 4 JButtons in a JFrame. I tested the code last night and everything was working fine. Now the JButtons do not appear in the JFrame today in the morning. I tried doing in Eclipse and still I got the same result.
The output I am getting :
My code:
import java.awt.Color;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JSeparator;
public class Control {
//JFrame
JFrame main = new JFrame();
//MenuBar
JMenuBar menuBar = new JMenuBar();
//Adding the menu
JMenu fileMenu = new JMenu("File");
JMenu functionMenu = new JMenu("Function");
JMenu helpMenu = new JMenu("Help");
//Adding the Menu Item
JMenuItem addFlight = new JMenuItem("Add Flight");
JMenuItem exit = new JMenuItem("Exit");
JMenuItem landFlight = new JMenuItem("Land Flight");
JMenuItem virtualPath = new JMenuItem("Virtual Path");
JMenuItem flightDetails = new JMenuItem("Flight Details");
JMenuItem about = new JMenuItem("About ...");
//JPanel
JPanel pnlButton = new JPanel();
//Buttons
JButton btnAddFlight = new JButton("Add Flight");
JButton btnLandFlight = new JButton("Land Flight");
JButton btnVirtualPath = new JButton("Virtual Path");
JButton btnFlightDetails = new JButton("Flight Details");
public Control() {
//Adding to the file menu
fileMenu.add(addFlight);
fileMenu.add(exit);
//Adding to the function menu
functionMenu.add(landFlight);
functionMenu.add(virtualPath);
functionMenu.add(flightDetails);
//Adding to the help menu
helpMenu.add(about);
exit.add(new JSeparator());
flightDetails.add(new JSeparator());
//Adding the Menus to the Menu Bar
menuBar.add(fileMenu);
menuBar.add(functionMenu);
menuBar.add(helpMenu);
//FlightInfo setbounds
btnAddFlight.setBounds(30, 30, 120, 30);
btnLandFlight.setBounds(30, 80, 120, 30);
btnVirtualPath.setBounds(30, 130, 120, 30);
btnFlightDetails.setBounds(30, 180, 120, 30);
//JPanel bounds
pnlButton.setLayout(null);
//Adding to JFrame
pnlButton.add(btnAddFlight);
pnlButton.add(btnLandFlight);
pnlButton.add(btnVirtualPath);
pnlButton.add(btnFlightDetails);
main.add(pnlButton);
// JFrame properties
main.setJMenuBar(menuBar);
main.setLayout(null);
main.setBackground(Color.red);
main.setSize(800, 300);
main.setTitle("Air Traffic Control");
main.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
main.setVisible(true);
//Adding the actionlistener
//btnAddFlight.addActionListener(new AddFlight());
//btnLandFlight.addActionListener(new LandFlight());
}
public static void main(String[] args) {
new Control();
}
}
I want to make the JButtons appear on the JFrame.
Many Thanks
You shouldn't add widgets (pnlButton) directly to the JFrame, you need to add them to a sub panel that is automatically created for you called the content pane. To get the content pane do
Container cp = main.getContentPane();
so then do
cp.add(pnlButton);
It's typically a bad idea to use a null layout with absolute positioning, btw.
Use GridBagLayout instead of null layout.
visit the following links for reference
http://www.java2s.com/Code/Java/Swing-JFC/WorkGridBagConstraints3.htm
http://download.oracle.com/docs/cd/E17409_01/javase/tutorial/uiswing/layout/gridbag.html