如何为包含多个 JPanel、JButton 和 JLabel 的 JFrame 设置背景颜色？

Question

问题

首先，我使用的是 Eclipse。所以，我正在构建一个框架，上面有多个面板、按钮和标签，我想要一种不同于默认白色的颜色。我尝试了几种解决方案，在 Whosebug 上找到，如下所示：

Setting background color on a jpanel
Use of paintComponent function on a JPanel
Setting background color for the JFrame

None 在这里和那里提出的解决方案对我有用。现在是时候展示一些代码了，以了解我想做什么，以及是否可以做到。

所以这是我的 JFrame class，名为 Body.java。因为我使用了很多 classes（扩展 JPanel，比如 15 个左右），所以我注释了 Body 中您无法编译的所有代码。我只是在框架上留下了一个小 class，之后我会在每个 class 上应用该解决方案。你当然可以问我更多 classes ！我运行那个代码，一切正常（编译执行完成）。我把所有东西都留下了，所以如果你得到更多 classes，你可以编译这段代码。

请注意，由于我是法国人，所有 classe 的名字都是法语，还有一些评论（但我运行列出了所有必要的评论以了解我在做什么，并且我添加了一些）。将显示的内容也将以法语显示。

密码

`Simplicity.java` :

这是我的控制器，只是用来启动Frame

package controller;

import view.Body;

public class Simplicity {

    public Simplicity() {
        
    }

    public static void main(String[] args) {
        
        Body fen = new Body();
        fen.setVisible(true);
        
    }

}

框架代码如下：

`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());
    }
    */
}

这就是我的 JFrame。现在这里是我之前讲过的小class，也就是我们项目的使用教程（Body.java开头的评论）

`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;
    } 

}

解决方案？

我知道 paintComponent、paint 有一些问题，但我试图了解它们是如何工作的，我尝试实施上面链接中的解决方案，但我无法实现。

所以，如果您还在那里，这就是我真正想做的事情：我想在 JPanel niveauBase 上应用一种颜色，因为所有内容都将放置在该面板上。所以如果我可以在上面涂上颜色，我就不必在每个面板上都涂上颜色了。

我想我已经解释了一切，但请随时询问更多解释或细节。

感谢您的宝贵时间，亲爱的 Whosebugers！

Answer 1

将主要内容窗格 JPanel 的背景设置为您想要的任何颜色，Color.BLUE。
通过对所有其他 JPanel 调用 setOpaque(false) 使显示在主 GUI 中的所有其他 JPanel 不透明（尽管我确实发现 "the solutions proposed here" 的 none 告诉你这个。这将允许 contentPane 的背景颜色显示出来。

还有一些补充建议：

虽然空布局和 setBounds() 对于 Swing 新手来说似乎是创建复杂 GUI 的最简单和最好的方法，但您创建的 Swing GUI 越多，您在使用时运行遇到的困难就越严重他们。它们不会在 GUI 调整大小时调整您的组件的大小，它们是皇家来增强或维护的，当放置在滚动窗格中时它们会完全失败，当在所有平台或不同的屏幕分辨率上查看时它们看起来很糟糕从原来的。

例如，您的一些代码显示为蓝色：

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!

   }
}

如何为包含多个 JPanel、JButton 和 JLabel 的 JFrame 设置背景颜色？

How to set a background color to a JFrame containing multiple JPanels, JButtons and JLabels?

java

user-interface

swing

colors

jpanel

问题

密码

`Simplicity.java` :

`Body.java`

`Tutoriel.java` :

解决方案？

如何为包含多个 JPanel、JButton 和 JLabel 的 JFrame 设置背景颜色？

How to set a background color to a JFrame containing multiple JPanels, JButtons and JLabels?

java

user-interface

swing

colors

jpanel

问题

密码

Simplicity.java :

Body.java

Tutoriel.java :

解决方案？

`Simplicity.java` :

`Body.java`

`Tutoriel.java` :