I have one class called TabBuilder which I use to create the interface of my application, but I'm going through a weird problem. If I try to run the code as it's below it will draw the mainScreen but if I request the SearchScreen from the BarMenu it doesn't show up. If I try to execute only SearchScreen by itself (calling its builder) within the public static void main (String[] args) MainString it wont show up too. but If go to the request event and tip TabBuilder tb = new TabBuilder(); tb.requestTab();the screen will show up as it should be. So, what might be wrong? Thanks in advance
MainScreen:
public class MainScreen{
public MainScreen()
{
TabBuilder tb = new TabBuilder();
tb.mainTab();
}
}
SearchScreen:
public class SearchScreen{
public void SearchScreen(){
TabBuilder tb = new TabBuilder();
tb.requestTab();
}
}
TabBuilder:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TabBuilder implements ActionListener {
JTabbedPane tabbedPane = new JTabbedPane();
JMenuItem close, request;
protected JTextField txtrequest = new JTextField();
JButton btrequest = new JButton();
protected JFrame requestFrame = new JFrame();
public void TabBuilder(){
}
public void mainTab(){
JMenuBar bar;
JMenu file, register;
JFrame mainFrame = new JFrame();
bar= new JMenuBar();
file= new JMenu("File");
register= new JMenu("Request");
close= new JMenuItem("Close");
close.addActionListener(this);
request= new JMenuItem("Request Query");
request.addActionListener(this);
bar.add(file);
bar.add(register);
file.add(close);
register.add(request);
mainFrame.setExtendedState(mainFrame.getExtendedState() | mainFrame.MAXIMIZED_BOTH); // Maximized Window or setSize(getMaximumSize());
mainFrame.setTitle("SHST");
mainFrame.setJMenuBar(bar);
mainFrame.setDefaultCloseOperation(0);
mainFrame.setVisible(true);
WindowListener J=new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
};
mainFrame.addWindowListener(J);
}
public void requestTab(){
JLabel lbrequest;
JPanel requestPane;
btrequest= new JButton("request");
lbrequest= new JLabel("Type Keywords in english to be requested below:");
txtrequest= new JTextField();
requestPane=new JPanel();
requestPane.setBackground(Color.gray);
requestPane.add(lbrequest);
requestPane.add(txtrequest);
requestPane.add(btrequest);
requestPane.setLayout(new GridLayout(3,3));
btrequest.setEnabled(true);
requestFrame.add(requestPane);
requestFrame.setTitle("SHST");
requestFrame.setSize(400, 400);
requestFrame.setVisible(true);
requestFrame.setDefaultCloseOperation(1);
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==close){
System.exit(0);
}
if(e.getSource()==request){
TabBuilder tb = new TabBuilder();
tb.requestTab();
}
}
public static void main (String[] args){
MainScreen m = new MainScreen();
}
}
The constructor of SearchScreen was settled as void. That caused nothing to return as object when calling the constructor. Newbie failure but simple solution.
Related
Im having trouble in selecting the JCombox items here is a gif:
Gif that shows exactly what is the problem
here is code that you can test your own as asked by #UNKNOWN
i delete everything that no needed so you can test , i have no error in console;
the code works perfectly but the combo slection error is there
import javax.swing.*;
import java.awt.*;
public class ForTest extends JFrame {
private JTextArea txtArea= null;
private JComboBox cmbFontSize = null;
private JComboBox cmbFontFamily = null;
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new ForTest();
}
});
}
private ForTest(){
init();
}
public void init(){
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this.setTitle("FOR TEST");
this.setLocationRelativeTo(null);
this.setSize(850,500);
txtArea= new JTextArea();
txtArea.setSize(830,470);
JScrollPane panScrollable = new JScrollPane(txtArea);
panScrollable.setSize(840,480);
this.add(panScrollable, BorderLayout.CENTER);
JMenuBar jmbTop= new JMenuBar();
JMenu modifica = new JMenu("Modifica");
modifica.setFont(new Font("arial",Font.PLAIN,15));
JMenu fontSettings= new JMenu("Font Settings");
JMenuItem cmbFam= new JMenuItem("FONT FAMILY");
cmbFontSize = new JComboBox();
cmbFontFamily = new JComboBox();
cmbFam.add(cmbFontFamily);
fontSettings.add(cmbFam);
// fontSettings.add(cmbFontSize);
//fontSettings.add(cmbFontFamily);
modifica.add(fontSettings);
jmbTop.add(modifica);
loadFontFamily();
loadFontSize();
this.setJMenuBar(jmbTop);
this.setVisible(true);
}
private void loadFontFamily() {
String fonts[] =
GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();
for ( int i = 0; i < fonts.length; i++ )
{
cmbFontFamily.addItem(fonts[i]);
}
}
private void loadFontSize() {
for (int i= 10; i<50;i++){
cmbFontSize.addItem(i);
}
}
}
the code is simple but cant understand why i cannot select the items
thanks in advance:)
You should wrap the JComboBox inside a JMenuItem object and then add the to the JMenu one. That would do the trick
I am trying to use a layered pane to make a menu for a program I'm working on, but the button won't display. I can't seem to figure out what it is...
public class FlashcardGUI {
public static void main(String[] args)
{
JFrame projectFrame = new JFrame("StudyFast Flashcard");
projectFrame.setName("StudyFast Flashcards");
projectFrame.setSize(1000,600);
projectFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
projectFrame.setVisible(true);
JLayeredPane projectLayeredPane = new JLayeredPane();
projectFrame.setContentPane(projectLayeredPane);
JPanel projectMenu1 = new JPanel();
projectLayeredPane.setLayer(projectMenu1, 0);
final JButton startNow = new JButton();
startNow.setText("Exit");
startNow.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
});
projectFrame.add(projectLayeredPane);
projectLayeredPane.add(projectMenu1);
projectMenu1.add(startNow);
}
}
Put these two lines at the end of your main method. The order is important in order to make the button display.
projectFrame.pack();
projectFrame.setVisible(true);
(Make sure to remove the projectFrame.setVisible(true); you already have on line 9.)
I have updated your code and it is working now. Please see the inline comments for the issue in your code. Hope this helps.
public class FlashcardGUI2 {
public static void main(String[] args) {
JFrame projectFrame = new JFrame("StudyFast Flashcard");
projectFrame.setName("StudyFast Flashcards");
projectFrame.setSize(1000,600);
projectFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
projectFrame.setVisible(true);
JLayeredPane projectLayeredPane = new JLayeredPane();
LayoutManager layout = new FlowLayout(); //creating a FlowLayout object
projectLayeredPane.setLayout(layout); //adding the layout to JLayeredPane
//because JLayeredPane do not have default layout of
//its own. The reason you were not
//getting the button displayed
projectLayeredPane.setPreferredSize(new Dimension(300, 310));
JPanel projectMenu1 = new JPanel();
final JButton startNow = new JButton();
startNow.setText("Exit");
startNow.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
projectLayeredPane.add(projectMenu1,new Integer(50));
projectLayeredPane.add(startNow,new Integer(10));
projectFrame.add(projectLayeredPane);
projectFrame.pack();
}
}
Hello I would like to ask how can I call my Main menu screen from MainScreen? and kindly explain a little more details about Listener.
below is my prepared code:
public class MainScreen {
public static void main(String[] args) {
JFrame frame = new JFrame();
JPanel panel = new JPanel();
frame.add(panel);
placeComponents(panel);
frame.setVisible(true);
}
private static void placeComponents(JPanel panel) {
JLabel WelcomeNote = new JLabel("Welcome");
panel.add(WelcomeNote);
JButton Start = new JButton("Start");
panel.add(Start);
//Insert action for Start button here
}
}
public class MainMenu {
public static void main(String[] args){
JFrame frame = new JFrame();
JPanel panel = new JPanel();
frame.add(panel);
placeComponents(panel);
frame.setVisible(true);
}
private static void placeComponents(JPanel panel) {
JLabel menuLbl = new JLabel("Main Menu");
panel.add(menuLbl);
}
}
What is wrong?
You cannot have two main methods in a single file in Java.
Program
Here is a demo program to change windows.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
class First extends JFrame
{
JLabel jlb = new JLabel("Label in First Window");
JButton jb = new JButton("Next Window");
First()
{
super("First Windows");
//Set this frame
this.setSize(350,250);
this.setLayout(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Setting size of components
jlb.setBounds(10,10,200,40);
jb.setBounds(10,120,150,40);
add(jlb);
add(jb);
jb.addActionListener((e)->{
this.setVisible(false);
new Second();
});
setVisible(true);
}
}
class Second extends JFrame implements ActionListener
{
JLabel jlb = new JLabel("Label in Second Window");
JButton jb = new JButton("Prev. Window");
Second()
{
super("Second Window");
this.setSize(350,250);
this.setLayout(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Setting size of components
jlb.setBounds(10,10,200,40);
jb.setBounds(10,120,150,40);
add(jlb);
add(jb);
jb.addActionListener(this);
setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
this.setVisible(false);
new First();
}
}
class StartHere
{
public static void main(String[] args) {
Runnable r = ()->{
new First();
};
r.run();
}
}
Understanding the above program.
The StartHere class has a main method. It is just used for calling the first window you like. I could even call Second using new Second().
First and Second are similar codes.
Both of them have buttons. On each button (or JButton) I have added a method named addActionListner(this). This method fires up an ActionEvent which as you can see in Second class is captured by actionPerformed method. This method is declared in Functional Interface, ActionListener. The 'this' passed in Second class is you telling where the actionPerformed method is present in your code. The parameter is an ActionListener. Hence, you have to implement ActionListener for the class where you define actionPerformed.
Bonus
The First class doesn't seem to follow the norms described above. I passed a strange syntax. It is a new feature included in Java 8.
See this Oracle tutorial about Lambda Expressions.
I have 2 classes. Both implements runnable to create the GUI. The first one is the main, and the second one is the secondary class.
I want within the actionlistener of the main class to startup the secondary class.
Here is the code (the two classes are separated files):
public class Main implements Runnable
{
private JTextField txt1, txt2;
private JLabel lbl1, lbl2;
public void run()
{
JFrame frame = new JFrame("Secondary");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container pane = frame.getContentPane();
JPanel background = new JPanel();
background.setLayout(new BoxLayout(background, BoxLayout.LINE_AXIS));
.........
// Horizontally adding the textbox and button in a Box
Box box = new Box(BoxLayout.Y_AXIS);
......
background.add(box);
pane.add(background);
frame.pack();
frame.setVisible(true);
}
private class SListener implements ActionListener
{
public void actionPerformed(ActionEvent a)
{
Secondary s = new Secondary();
}
}
public static void main (String[] args)
{
Main gui = new Main();
SwingUtilities.invokeLater(gui);
}
}
public class Secondary implements Runnable
{
private JTextField txt1, txt2;
private JLabel lbl1, lbl2;
public Secondary()
{
Secondary gui = new Secondary();
SwingUtilities.invokeLater(gui);
}
public void run()
{
JFrame frame = new JFrame("Secondary");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container pane = frame.getContentPane();
JPanel background = new JPanel();
background.setLayout(new BoxLayout(background, BoxLayout.LINE_AXIS));
.........
// Horizontally adding the textbox and button in a Box
Box box = new Box(BoxLayout.Y_AXIS);
......
background.add(box);
pane.add(background);
frame.pack();
frame.setVisible(true);
}
}
I want to keep the code in two files, I don't want to mixed the two classes in one file.
As you can see from the code, in the Secondary class, in it's constructor I create an Instance of the Secondary class and I run the gui so that when the Instance of this class is created in the Main class, to run the gui.
Unfortunately this technique is not working.
Any ideas?
Thanks
The following line are complety wrong:
public Secondary(){
Secondary gui = new Secondary();
SwingUtilities.invokeLater(gui);
}
Each time you call new Secondary() somewhere in your code, the above code will be triggered, which in turn calls new Secondary() again, and again, and again, ... and your program is blocked.
You probably want to replace it either by
public Secondary(){
SwingUtilities.invokeLater(this);
}
which will avoid the loop, but this is weird behaviour for a constructor.
It makes much more sense to switch to an empty constructor (or delete it all together)
public Secondary(){
}
and rewrite your listener to
public void actionPerformed(ActionEvent a){
Secondary s = new Secondary();
SwingUtilities.invokeLater( s );
}
I would recommend that you completely re-design your program. I find that it is most helpful to gear my GUI's towards creation of JPanels, not top level windows such as JFrame, which can then be placed into JFrames or JDialogs, or JTabbedPanes, or swapped via CardLayouts, wherever needed. I find that this greatly increase the flexibility of my GUI coding, and is exactly what I suggest that you do. So...
Your first class creates a JPanel that is then placed into a JFrame.
In the first class's ActionListener, create an instance of the 2nd class, place it into a JDialog (not a JFrame), and then display it.
For example,
import java.awt.Component;
import java.awt.Dialog.ModalityType;
import java.awt.Dimension;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.*;
public class TwoWindowEg {
public TwoWindowEg() {
// TODO Auto-generated constructor stub
}
private static void createAndShowGui() {
GuiPanel1 mainPanel = new GuiPanel1();
JFrame frame = new JFrame("Main GUI");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
class GuiPanel1 extends JPanel {
private static final int PREF_W = 800;
private static final int PREF_H = 650;
private GuiPanel2 guiPanel2 = new GuiPanel2(); // our second class!
private JDialog dialog = null; // our JDialog
public GuiPanel1() {
setBorder(BorderFactory.createTitledBorder("GUI Panel 1"));
add(new JButton(new LaunchNewWindowAction("Launch New Window")));
add(new JButton(new DisposeAction("Exit", KeyEvent.VK_X)));
}
#Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
private class LaunchNewWindowAction extends AbstractAction {
public LaunchNewWindowAction(String name) {
super(name);
}
#Override
public void actionPerformed(ActionEvent e) {
if (dialog == null) {
// get the Window that holds this JPanel
Window win = SwingUtilities.getWindowAncestor(GuiPanel1.this);
dialog = new JDialog(win, "Second Window", ModalityType.APPLICATION_MODAL);
dialog.add(guiPanel2);
dialog.pack();
}
dialog.setVisible(true);
}
}
}
class GuiPanel2 extends JPanel {
public GuiPanel2() {
setBorder(BorderFactory.createTitledBorder("GUI Panel 1"));
add(new JLabel("The second JPanel/Class"));
add(new JButton(new DisposeAction("Exit", KeyEvent.VK_X)));
}
}
class DisposeAction extends AbstractAction {
public DisposeAction(String name, int mnemonic) {
super(name);
putValue(MNEMONIC_KEY, mnemonic);
}
#Override
public void actionPerformed(ActionEvent e) {
Component comp = (Component) e.getSource();
Window win = SwingUtilities.getWindowAncestor(comp);
win.dispose();
}
}
Alternatively, you could swap JPanel "views" using a CardLayout, but either way, you will want to avoid showing two JFrames. Please have a look at The Use of Multiple JFrames, Good/Bad Practice?.
I'm working on a pathfinder program which uses GUI. I tried to run the program before I added some stuff and it showed everything fine. But after working on it some more it stopped showing the buttons and the menu bar.
Here is the code. Some variable names are in Swedish as well, but I hope that it won't be an issue. (Please take in mind that the program is far from finished.)
Thank you in advance!
import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
public class Pathfinder extends JFrame {
JButton hittaVäg, visaFörbindelse, nyPlats, nyFörbindelse, ändraFörbindelse;
JMenuBar menyBar;
JMenuItem ny, avsluta, hittaVägMeny, visaFörbindelseMeny, nyPlatsMeny, nyFörbindelseMeny, ändraFörbindelseMeny;
String str = System.getProperty("user.dir");
JFileChooser jfc;
BildPanel Bild = null;
Pathfinder(){
super("PathFinder");
setLayout(new BorderLayout());
setSize(590, 400);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
jfc = new JFileChooser(".");
JPanel norra = new JPanel();
add(norra, "norra");
JButton hittaVäg = new JButton("Hitta väg");
JButton visaFörbindelse = new JButton("Visa förbindelse");
JButton nyPlats = new JButton("Ny plats");
JButton nyFörbindelse = new JButton("Ny förbindelse");
JButton ändraFörbindelse = new JButton("Ändra förbindelse");
norra.add(hittaVäg);
norra.add(visaFörbindelse);
norra.add(nyPlats);
norra.add(nyFörbindelse);
norra.add(ändraFörbindelse);
hittaVäg.addActionListener(new HittaLyss());
visaFörbindelse.addActionListener(new VisaLyss());
nyPlats.addActionListener(new NyPlatsLyss());
nyFörbindelse.addActionListener(new NyFörbindelseLyss());
ändraFörbindelse.addActionListener(new NyFörbindelseLyss());
JMenuBar menyBar = new JMenuBar();
setJMenuBar(menyBar);
JMenu arkivMeny = new JMenu("Arkiv");
JMenu operationerMeny = new JMenu("Operationer");
menyBar.add(arkivMeny);
menyBar.add(operationerMeny);
JMenuItem ny = new JMenuItem("Ny");
JMenuItem avsluta = new JMenuItem("Avsluta");
arkivMeny.add(ny);
arkivMeny.add(avsluta);
ny.addActionListener(new NyLyss());
avsluta.addActionListener(new AvslutaLyss());
JMenuItem hittaVägMeny = new JMenuItem("Hitta väg");
JMenuItem visaFörbindelseMeny = new JMenuItem("Visa förbindelse");
JMenuItem nyPlatsMeny = new JMenuItem("Ny plats");
JMenuItem nyFörbindelseMeny = new JMenuItem("Ny förbindelse");
JMenuItem ändraFörbindelseMeny = new JMenuItem("Ändra förbindelse");
operationerMeny.add(hittaVägMeny);
operationerMeny.add(visaFörbindelseMeny);
operationerMeny.add(nyPlatsMeny);
operationerMeny.add(nyFörbindelseMeny);
operationerMeny.add(ändraFörbindelseMeny);
hittaVäg.addActionListener(new HittaLyss());
visaFörbindelse.addActionListener(new VisaLyss());
nyPlats.addActionListener(new NyPlatsLyss());
nyFörbindelse.addActionListener(new NyFörbindelseLyss());
ändraFörbindelse.addActionListener(new ÄndraFörbindelseLyss());
}
class HittaLyss implements ActionListener{
public void actionPerformed(ActionEvent ave){
}
}
class VisaLyss implements ActionListener{
public void actionPerformed(ActionEvent ave){
}
}
class NyPlatsLyss implements ActionListener{
public void actionPerformed(ActionEvent ave){
}
}
class NyFörbindelseLyss implements ActionListener{
public void actionPerformed(ActionEvent ave){
}
}
class ÄndraFörbindelseLyss implements ActionListener{
public void actionPerformed(ActionEvent ave){
}
}
class NyLyss implements ActionListener{
public void actionPerformed(ActionEvent ave){
int svar = jfc.showOpenDialog(Pathfinder.this);
if (svar == JFileChooser.APPROVE_OPTION){
File f = jfc.getSelectedFile();
String filnamn = f.getAbsolutePath();
if (Bild != null)
remove(Bild);
Bild = new BildPanel(filnamn);
add(Bild, BorderLayout.CENTER);
validate();
repaint();
pack();
}
}
}
class AvslutaLyss implements ActionListener{
public void actionPerformed(ActionEvent ave){
}
}
public static void main (String[] args){
new Pathfinder();
}
}
One of the issues is IllegalArgumentException at line
add(norra, "norra");
The layout of the frame's content pane is set to BorderLayout, but this layout does not understand "norra" constraint. See How to Use BorderLayout for more details and examples.
Also, you should call setVisible once all the components are added and initialized.
Call setVisible(true) on the JFrame after adding all components, not before. The order should be:
Add components
Call pack() on the JFrame
Then call setVisible(true) on the JFrame.
You need to first add the components and then call setVisible(true).
So the order matters here. Try it, see if it helps.