How to set a background color to a JFrame containing multiple JPanels, JButtons and JLabels?
Question
The problem
First, I am using Eclipse. So, I'm building a Frame with multiple Panels, Buttons and Labels on it, and I would like to have another color than the default white. I tried several solution, found here on StackOverflow, like these :
- Setting background color on a jpanel
- Use of paintComponent function on a JPanel
- Setting background color for the JFrame
None of the solutions proposed here and there worked for me. Now is time to show a bit of code, in order to understand what I want to do, and if it is possible to do it.
So here is my JFrame class, called Body.java . As I am using a lot of classes (extending JPanel, like 15 or so), I commented all the code in Body that you can't compile. I just left a small class used on my frame, and I will apply the solution afterwards on each class. You can of course ask me for more classes ! I ran that code, and everything is OK (compilation and execution complete). I left everything so if you get more classes, you can compile this code.
Note that as I'm French, all the classe's names are in French, some comments too (but I translated all the necessary comments to understand what I'm doing, and I added some). What will be displayed will be in French too.
The code
Simplicity.java :
it is my controller, just used to launch the Frame
package controller;
import view.Body;
public class Simplicity {
public Simplicity() {
}
public static void main(String[] args) {
Body fen = new Body();
fen.setVisible(true);
}
}
Here is the code of the Frame :
Body.java
package view;
import java.awt.Color;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextPane;
/**
* @author David Rei
*
*/
/*
* This is a project in which we had to develop a UI for smartphones.
*/
public class Body extends JFrame{
private static final long serialVersionUID = 1L;
// initial size : width = 230, height = 390.
private static final int FRAME_WIDTH = 250;
private static final int FRAME_HEIGHT = 400;
// My fixed panels
private static JPanel niveauBase = new JPanel(); // Basic panel -> everything will go on it
private static JPanel infosReseauxHeure = new JPanel(); // Panel fixed
private JPanel panelChangeable = new JPanel(); // Scrolling panel
// up of page info
private static JTextPane infos = new JTextPane();
// Creation of the different pages (panels)
private Tutoriel tuto;
/*
private Accueil1 ac1;
private Accueil2 ac2;
private Medias1 med1;
private Multimedias1 multimed1;
private Outils1 out1;
private Outils2 out2;
private Jeux1 jeux1;
private Jeux2 jeux2;
private SocialInternet1 socInt1;
private SocialInternet2 socInt2;
private Appeler appeler;
private Urgences urgences;
private AppelEnCours appelEnCours;
private DemarrageApp demarrageApp;
private EnConstruction enConstruction;
*/
public Body() {
super();
buildFrame();
this.buildContentPane();
this.setContentPane(niveauBase);
}
public void buildFrame() {
this.setTitle("Simplicity");
this.setResizable(false);
this.setSize(FRAME_WIDTH, FRAME_HEIGHT);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.getContentPane().setBackground(new Color(255, 105, 86));
// toutes les dimensions sont en relatif par rapport à la taille de la JFrame. de fait, en changeant celle-ci, on peut adapter l'interface à différents écrans
// on met en place ce qui ne changera jamais d'un panel à l'autre --> les infos de base et le support
// support
niveauBase.setLayout(null);
// basic info
infosReseauxHeure.setBounds(0, 0, this.getWidth(), (int)(0.12*this.getHeight()));
infosReseauxHeure.setLayout(new GridLayout(0,1));
infosReseauxHeure.add(infos);
// adding the text
niveauBase.add(infosReseauxHeure);
// defining the limits of the changing Panel, bc they are always the same
panelChangeable.setLayout(null);
// My first try of changing the background
// panelChangeable.setBackground(new Color(255, 105, 86));
panelChangeable.setBounds(0, infosReseauxHeure.getHeight(), this.getWidth(), (int) (0.88*this.getHeight()));
niveauBase.add(panelChangeable);
// the basic frame, which will never change, is ready.
}
public void buildContentPane() {
// Instantiation of the pages
tuto = new Tutoriel(this);
/*
ac1 = new Accueil1(this);
ac2 = new Accueil2(this);
med1 = new Medias1(this);
multimed1 = new Multimedias1(this);
out1 = new Outils1(this);
out2 = new Outils2(this);
jeux1 = new Jeux1(this);
jeux2 = new Jeux2(this);
socInt1 = new SocialInternet1(this);
socInt2 = new SocialInternet2(this);
appeler = new Appeler(this);
urgences = new Urgences(this);
appelEnCours = new AppelEnCours(this);
demarrageApp = new DemarrageApp(this);
enConstruction = new EnConstruction(this);
*/
// Tutoriel is the first to be displayed
CaractsPanelChangeant(tuto);
panelChangeable.add(tuto);
// all the other panels have the same displaying characteristics
// navigating panels
/*
addPanels(ac1);
addPanels(ac2);
addPanels(med1);
addPanels(multimed1);
addPanels(out1);
addPanels(out2);
addPanels(jeux1);
addPanels(jeux2);
addPanels(socInt1);
addPanels(socInt2);
// applications panels
addPanels(appeler);
addPanels(urgences);
// diverse panels
addPanels(appelEnCours);
addPanels(demarrageApp);
addPanels(enConstruction);
*/
}
// fixating the same size and origins for all the panels
public void CaractsPanelChangeant(JPanel a) {
a.setBounds(0, 0, panelChangeable.getWidth(), panelChangeable.getHeight());
}
// regroup the same actions for the panels : bounds, adding and invisible
public void addPanels(JPanel a) {
CaractsPanelChangeant(a);
panelChangeable.add(a);
a.setVisible(false);
/*
* I tried to change the background here too
a.setOpaque(true);
a.setBackground(new Color(255, 105, 86));
*/
}
// JPanel getters
public static int getInfosReseauxHeureHeight() {
return infosReseauxHeure.getHeight();
}
/*
public Accueil1 getAc1() {
return ac1;
}
public Accueil2 getAc2() {
return ac2;
}
public Medias1 getMed1() {
return med1;
}
public Multimedias1 getMultimed1() {
return multimed1;
}
public Outils1 getOut1() {
return out1;
}
public Outils2 getOut2() {
return out2;
}
public Jeux1 getJeux1() {
return jeux1;
}
public Jeux2 getJeux2() {
return jeux2;
}
public SocialInternet1 getSocInt1() {
return socInt1;
}
public SocialInternet2 getSocInt2() {
return socInt2;
}
public Appeler getAppeler() {
return appeler;
}
public Urgences getUrgences() {
return urgences;
}
public AppelEnCours getAppelEnCours() {
return appelEnCours;
}
public DemarrageApp getDemarrageApp() {
return demarrageApp;
}
public EnConstruction getEnConstruction() {
return enConstruction;
}
*/
public Tutoriel getTuto() {
return tuto;
}
// other getters
public static int getFrameWidth() {
return FRAME_WIDTH;
}
public static int getFrameHeight() {
return FRAME_HEIGHT;
}
public JPanel getPanelChangeable() {
return panelChangeable;
}
// setters
public void setPanelChangeable(JPanel a) {
this.panelChangeable = a;
}
/*
public void switchAccueil(){
ac1.setVisible(!ac1.isVisible());
ac2.setVisible(!ac2.isVisible());
}
*/
}
So this is my JFrame. Here is now the small class I talked previously, which is the tutorial of using our project (comments in Body.java , at the beginning).
Tutoriel.java :
package view;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Insets;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import model.SelectAction;
/**
* @author David Rei
*
*/
/*
* This class displays a tutorial when the application is launched.
* It is then setVisible(false), to not appear again.
* Here, I use it to show you one of my panels, which background has to be a color.
*
*/
public class Tutoriel extends JPanel {
private static final long serialVersionUID = 1L;
private Body body;
// panels
private JPanel tout;
private JPanel centre;
private JPanel messageCentre1;
private JPanel messageCentre2;
// buttons
private JButton ok1;
private JButton ok2;
private JLabel messageHaut;
private JLabel tuto1;
private JLabel FGauche;
private JLabel FDroite;
private JLabel tuto2;
private JCheckBox tutoOff;
//private Color fond = new Color(255, 105, 86);
public Tutoriel(Body body) {
super();
this.body = body;
buildTuto();
}
public void buildTuto() {
this.setLayout(new GridLayout(0,1));
tout = new JPanel();
tout.setLayout(new BorderLayout(0,0));
this.add(tout);
// tutorial announce
messageHaut = new JLabel("TUTORIEL");
messageHaut.setForeground(new Color(0, 0, 0));
messageHaut.setFont(new Font("Arial", Font.BOLD, 20));
messageHaut.setHorizontalAlignment(JLabel.CENTER);
tout.add(messageHaut, BorderLayout.NORTH);
// central panel, with the tutorial
centre = new JPanel();
centre.setLayout(null);
tout.add(centre, BorderLayout.CENTER);
// first tutorial
messageCentre1 = new JPanel();
messageCentre1.setLayout(null);
messageCentre1.setBounds(0, 0, 250, 300);
centre.add(messageCentre1);
tuto1 = new JLabel("<html>POUR NAVIGUER ENTRE<br>LES DIFFÉRENTES PAGES<br>UTILISER LES FLÈCHES</html>");
tuto1.setForeground(new Color(0, 0, 0));
tuto1.setFont(new Font("Arial", Font.BOLD, 16));
tuto1.setHorizontalAlignment(JLabel.CENTER);
tuto1.setVerticalAlignment(JLabel.CENTER);
tuto1.setBounds(20, -10, 200, 150);
messageCentre1.add(tuto1);
// arrows
FGauche = new JLabel();
FGauche.setIcon(new ImageIcon(getClass().getResource("/img/left-blue.png")));
FGauche.setBackground(new Color(255, 153, 0));
FGauche.setBounds(80, 150, 40, 40);
messageCentre1.add(FGauche);
FDroite = new JLabel();
FDroite.setIcon(new ImageIcon(getClass().getResource("/img/right-blue.png")));
FDroite.setBackground(new Color(255, 153, 0));
FDroite.setBounds(140, 150, 40, 40);
messageCentre1.add(FDroite);
// OK button, first tutorial
ok1 = new JButton(new SelectAction(body));
ok1.setActionCommand("tuto1");
ok1.setText("OK");
ok1.setMargin(new Insets(5, 5, 5, 5));
ok1.setForeground(new Color(0, 0, 0));
ok1.setBackground(new Color(255, 153, 0));
ok1.setBounds(105, 230, 40, 40);
messageCentre1.add(ok1);
// second tutorial
messageCentre2 = new JPanel();
messageCentre2.setLayout(null);
messageCentre2.setBounds(0, 0, 250, 300);
centre.add(messageCentre2);
tuto2 = new JLabel("<html>POUR RETOURNER<br>A L'ACCUEIL, APPUYER<br>SUR LA TOUCHE G</html>");
tuto2.setForeground(new Color(0, 0, 0));
tuto2.setFont(new Font("Arial", Font.BOLD, 16));
tuto2.setHorizontalAlignment(JLabel.CENTER);
tuto2.setVerticalAlignment(JLabel.CENTER);
tuto2.setBounds(20, -10, 200, 150);
messageCentre2.add(tuto2);
// OK button, second tutorial
ok2 = new JButton(new SelectAction(body));
ok2.setActionCommand("tuto2");
ok2.setText("OK");
ok2.setMargin(new Insets(5, 5, 5, 5));
ok2.setForeground(new Color(0, 0, 0));
ok2.setBackground(new Color(255, 153, 0));
ok2.setBounds(105, 230, 40, 40);
messageCentre2.add(ok2);
// visibility of tutorial panels
//messageCentre1.setVisible(false);
messageCentre2.setVisible(false);
// deactivate the tutorial (and reach the main page)
tutoOff = new JCheckBox(new SelectAction(body));
tutoOff.setActionCommand("tutoOff");
tutoOff.setText("NE PLUS AFFICHER AU DÉMARRAGE");
tutoOff.setForeground(new Color(0, 0, 0));
tout.add(tutoOff, BorderLayout.SOUTH);
}
/*
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(fond);
g.drawOval(0, 0, 50, 50);
}
*/
public JPanel getMessageCentre1() {
return messageCentre1;
}
public JPanel getMessageCentre2() {
return messageCentre2;
}
}
The solution?
I know there is something with paintComponent , paint but I tried to understand how they work, I tried to implement the solutions in the links above, and I couldn't achieve it.
So, if you're still there, here is what I exactly would like to do : I would like to apply a color on the JPanel niveauBase , because everything will be placed on that Panel. So if I can have a color on it, I will not have to apply a color on each panel.
I think I explained everything, but feel free to ask for more explanations or details.
Thank you for your time, dear StackOverflowers !
1 answers
solution1
3 ACCPTED 2015-04-05 18:37:42
- Set the main content pane JPanel's background to whatever color you desire,
Color.BLUE. - Make all other JPanels that is displayed in your main GUI non-opaque by calling
setOpaque(false)on all of them (although I do find it hard that none of "the solutions proposed here" told you this. This will allow the background color of the contentPane to show through.
Also some side recommendations:
- While null layouts and
setBounds()might seem to Swing newbies like the easiest and best way to create complex GUI's, the more Swing GUI'S you create the more serious difficulties you will run into when using them. They won't resize your components when the GUI resizes, they are a royal witch to enhance or maintain, they fail completely when placed in scrollpanes, they look gawd-awful when viewed on all platforms or screen resolutions that are different from the original one.
For example, some of your code with the blue showing through:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
//!! import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextPane;
public class Simplicity {
public Simplicity() {
}
public static void main(String[] args) {
Body fen = new Body();
fen.setVisible(true);
}
}
class Body extends JFrame{
private static final long serialVersionUID = 1L;
private static final int FRAME_WIDTH = 250;
private static final int FRAME_HEIGHT = 400;
private static JPanel niveauBase = new JPanel(); // Basic panel -> everything will go on it
private static JPanel infosReseauxHeure = new JPanel(); // Panel fixed
private JPanel panelChangeable = new JPanel(); // Scrolling panel
// up of page info
private static JTextPane infos = new JTextPane();
// Creation of the different pages (panels)
private Tutoriel tuto;
public Body() {
super();
buildFrame();
this.buildContentPane();
this.setContentPane(niveauBase);
}
public void buildFrame() {
this.setTitle("Simplicity");
this.setResizable(false);
this.setSize(FRAME_WIDTH, FRAME_HEIGHT);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.getContentPane().setBackground(new Color(255, 105, 86));
// toutes les dimensions sont en relatif par rapport à la taille de la JFrame. de fait, en changeant celle-ci, on peut adapter l'interface à différents écrans
// on met en place ce qui ne changera jamais d'un panel à l'autre --> les infos de base et le support
// support
niveauBase.setLayout(null);
niveauBase.setBackground(Color.blue); //!!
// basic info
infosReseauxHeure.setOpaque(false);
infosReseauxHeure.setBounds(0, 0, this.getWidth(), (int)(0.12*this.getHeight()));
infosReseauxHeure.setLayout(new GridLayout(0,1));
infosReseauxHeure.add(infos);
// adding the text
niveauBase.add(infosReseauxHeure);
// defining the limits of the changing Panel, bc they are always the same
panelChangeable.setOpaque(false);
panelChangeable.setLayout(null);
// My first try of changing the background
// panelChangeable.setBackground(new Color(255, 105, 86));
panelChangeable.setBounds(0, infosReseauxHeure.getHeight(), this.getWidth(), (int) (0.88*this.getHeight()));
niveauBase.add(panelChangeable);
// the basic frame, which will never change, is ready.
}
public void buildContentPane() {
// Instantiation of the pages
tuto = new Tutoriel(this);
/*
ac1 = new Accueil1(this);
ac2 = new Accueil2(this);
med1 = new Medias1(this);
multimed1 = new Multimedias1(this);
out1 = new Outils1(this);
out2 = new Outils2(this);
jeux1 = new Jeux1(this);
jeux2 = new Jeux2(this);
socInt1 = new SocialInternet1(this);
socInt2 = new SocialInternet2(this);
appeler = new Appeler(this);
urgences = new Urgences(this);
appelEnCours = new AppelEnCours(this);
demarrageApp = new DemarrageApp(this);
enConstruction = new EnConstruction(this);
*/
// Tutoriel is the first to be displayed
CaractsPanelChangeant(tuto);
panelChangeable.add(tuto);
// all the other panels have the same displaying characteristics
// navigating panels
/*
addPanels(ac1);
addPanels(ac2);
addPanels(med1);
addPanels(multimed1);
addPanels(out1);
addPanels(out2);
addPanels(jeux1);
addPanels(jeux2);
addPanels(socInt1);
addPanels(socInt2);
// applications panels
addPanels(appeler);
addPanels(urgences);
// diverse panels
addPanels(appelEnCours);
addPanels(demarrageApp);
addPanels(enConstruction);
*/
}
// fixating the same size and origins for all the panels
public void CaractsPanelChangeant(JPanel a) {
a.setBounds(0, 0, panelChangeable.getWidth(), panelChangeable.getHeight());
}
// regroup the same actions for the panels : bounds, adding and invisible
public void addPanels(JPanel a) {
CaractsPanelChangeant(a);
panelChangeable.add(a);
a.setVisible(false);
/*
* I tried to change the background here too
a.setOpaque(true);
a.setBackground(new Color(255, 105, 86));
*/
}
// JPanel getters
public static int getInfosReseauxHeureHeight() {
return infosReseauxHeure.getHeight();
}
/*
public Accueil1 getAc1() {
return ac1;
}
public Accueil2 getAc2() {
return ac2;
}
public Medias1 getMed1() {
return med1;
}
public Multimedias1 getMultimed1() {
return multimed1;
}
public Outils1 getOut1() {
return out1;
}
public Outils2 getOut2() {
return out2;
}
public Jeux1 getJeux1() {
return jeux1;
}
public Jeux2 getJeux2() {
return jeux2;
}
public SocialInternet1 getSocInt1() {
return socInt1;
}
public SocialInternet2 getSocInt2() {
return socInt2;
}
public Appeler getAppeler() {
return appeler;
}
public Urgences getUrgences() {
return urgences;
}
public AppelEnCours getAppelEnCours() {
return appelEnCours;
}
public DemarrageApp getDemarrageApp() {
return demarrageApp;
}
public EnConstruction getEnConstruction() {
return enConstruction;
}
*/
public Tutoriel getTuto() {
return tuto;
}
// other getters
public static int getFrameWidth() {
return FRAME_WIDTH;
}
public static int getFrameHeight() {
return FRAME_HEIGHT;
}
public JPanel getPanelChangeable() {
return panelChangeable;
}
// setters
public void setPanelChangeable(JPanel a) {
this.panelChangeable = a;
}
/*
public void switchAccueil(){
ac1.setVisible(!ac1.isVisible());
ac2.setVisible(!ac2.isVisible());
}
*/
}
class Tutoriel extends JPanel {
private static final long serialVersionUID = 1L;
private Body body;
// panels
private JPanel tout;
private JPanel centre;
private JPanel messageCentre1;
private JPanel messageCentre2;
// buttons
private JButton ok1;
private JButton ok2;
private JLabel messageHaut;
private JLabel tuto1;
private JLabel FGauche;
private JLabel FDroite;
private JLabel tuto2;
private JCheckBox tutoOff;
//private Color fond = new Color(255, 105, 86);
public Tutoriel(Body body) {
super();
this.body = body;
buildTuto();
setOpaque(false);
}
public void buildTuto() {
this.setLayout(new GridLayout(0,1));
tout = new JPanel();
tout.setOpaque(false); //!!
tout.setLayout(new BorderLayout(0,0));
this.add(tout);
// tutorial announce
messageHaut = new JLabel("TUTORIEL");
messageHaut.setForeground(new Color(0, 0, 0));
messageHaut.setFont(new Font("Arial", Font.BOLD, 20));
messageHaut.setHorizontalAlignment(JLabel.CENTER);
tout.add(messageHaut, BorderLayout.NORTH);
// central panel, with the tutorial
centre = new JPanel();
centre.setOpaque(false);
centre.setLayout(null);
tout.add(centre, BorderLayout.CENTER);
// first tutorial
messageCentre1 = new JPanel();
messageCentre1.setLayout(null);
messageCentre1.setOpaque(false);
messageCentre1.setBounds(0, 0, 250, 300);
centre.add(messageCentre1);
tuto1 = new JLabel("<html>POUR NAVIGUER ENTRE<br>LES DIFFÉRENTES PAGES<br>UTILISER LES FLÈCHES</html>");
tuto1.setForeground(new Color(0, 0, 0));
tuto1.setFont(new Font("Arial", Font.BOLD, 16));
tuto1.setHorizontalAlignment(JLabel.CENTER);
tuto1.setVerticalAlignment(JLabel.CENTER);
tuto1.setBounds(20, -10, 200, 150);
messageCentre1.add(tuto1);
// arrows
FGauche = new JLabel("G");
//!! FGauche.setIcon(new ImageIcon(getClass().getResource("/img/left-blue.png")));
FGauche.setBackground(new Color(255, 153, 0));
FGauche.setBounds(80, 150, 40, 40);
messageCentre1.add(FGauche);
FDroite = new JLabel("D");
//!! FDroite.setIcon(new ImageIcon(getClass().getResource("/img/right-blue.png")));
FDroite.setBackground(new Color(255, 153, 0));
FDroite.setBounds(140, 150, 40, 40);
messageCentre1.add(FDroite);
// OK button, first tutorial
ok1 = new JButton(new SelectAction(body));
ok1.setActionCommand("tuto1");
ok1.setText("OK");
ok1.setMargin(new Insets(5, 5, 5, 5));
ok1.setForeground(new Color(0, 0, 0));
ok1.setBackground(new Color(255, 153, 0));
ok1.setBounds(105, 230, 40, 40);
messageCentre1.add(ok1);
// second tutorial
messageCentre2 = new JPanel();
messageCentre2.setOpaque(false);
messageCentre2.setLayout(null);
messageCentre2.setBounds(0, 0, 250, 300);
centre.add(messageCentre2);
tuto2 = new JLabel("<html>POUR RETOURNER<br>A L'ACCUEIL, APPUYER<br>SUR LA TOUCHE G</html>");
tuto2.setForeground(new Color(0, 0, 0));
tuto2.setFont(new Font("Arial", Font.BOLD, 16));
tuto2.setHorizontalAlignment(JLabel.CENTER);
tuto2.setVerticalAlignment(JLabel.CENTER);
tuto2.setBounds(20, -10, 200, 150);
messageCentre2.add(tuto2);
// OK button, second tutorial
ok2 = new JButton(new SelectAction(body));
ok2.setActionCommand("tuto2");
ok2.setText("OK");
ok2.setMargin(new Insets(5, 5, 5, 5));
ok2.setForeground(new Color(0, 0, 0));
ok2.setBackground(new Color(255, 153, 0));
ok2.setBounds(105, 230, 40, 40);
messageCentre2.add(ok2);
// visibility of tutorial panels
//messageCentre1.setVisible(false);
messageCentre2.setVisible(false);
// deactivate the tutorial (and reach the main page)
tutoOff = new JCheckBox(new SelectAction(body));
tutoOff.setActionCommand("tutoOff");
tutoOff.setText("NE PLUS AFFICHER AU DÉMARRAGE");
tutoOff.setForeground(new Color(0, 0, 0));
tout.add(tutoOff, BorderLayout.SOUTH);
}
/*
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(fond);
g.drawOval(0, 0, 50, 50);
}
*/
public JPanel getMessageCentre1() {
return messageCentre1;
}
public JPanel getMessageCentre2() {
return messageCentre2;
}
}
// !! hadd to add this to get code to compile!
class SelectAction extends AbstractAction {
private Body body;
public SelectAction(Body body) {
this.body = body;
}
@Override
public void actionPerformed(ActionEvent evt) {
// TODO put some junk in here!
}
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.
Related Question
How to move JButtons and JLabels position in a JPanel, JFrame
How do I display JButtons and JLabels in a JFrame?
How to create a new JFrame with dynamic JLabels & JButtons without encountering NullPointerException?
JButtons inside JPanels with a GridLayout JFrame
How to change background in JFrame consisting of JPanels?
By using custom color as Background JFrame stops showing any JPanels
How to add multiple JPanels to JFrame with different sizes
How to use multiple jpanels in the general jframe
How to add JLabels to JFrame?
Setting multiple JPanels to JFrame
Related Tags