JPanel wird nicht angezeigt

[schokoscharpe123]

Ich bin grade dabei mir ein paar Grundkenntnisse in Java anzueignen und bin deshalb damit beschäftigt ein kleines "Progrämmchen" zu schreiben, doch auf einmal wird mir im Haupt-Programm(Klasse: Beispielklasse2) das home Panel in meinem Frame nicht angezeigt... Danke schonmal fürs Helfen

Klasse: Beispielklasse:

package de.beispielnutzer.Beispielklasse;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Arrays;

public class Beispielklasse extends JPanel
                          implements ActionListener {
    private static String OK = "ok";
 
    int t = 3;
    private JFrame controllingFrame;
    private JPasswordField passwordField;
    private JPasswordField usernameField;
    public Prog(JFrame f) {
        //Flow Layout wird benutzt.
        controllingFrame = f;
     
        //Usernameeingabe wird erstellt
        usernameField = new JPasswordField(10);
        usernameField.addActionListener(this);
     
        //Passworteingabe wird erstellt.
        passwordField = new JPasswordField(10);
        passwordField.setActionCommand(OK);
        passwordField.addActionListener(this);
     
        JLabel userlabel = new JLabel("Username eingeben: ");
        userlabel.setLabelFor(usernameField);
        JLabel label = new JLabel("Password eingeben: ");
        label.setLabelFor(passwordField);
        JComponent buttonPane = createButtonPanel();
        //Panels werden erstellt.
        JPanel textPane = new JPanel(new FlowLayout(FlowLayout.TRAILING));
        textPane.add(userlabel);
        textPane.add(usernameField);
        textPane.add(label);
        textPane.add(passwordField);
    
        controllingFrame.setResizable(false);
        controllingFrame.setAlwaysOnTop(true);
     
        add(textPane);
        add(buttonPane);
    }
    protected JComponent createButtonPanel() {
        JPanel p = new JPanel(new GridLayout(0,1));
        JButton okButton = new JButton("OK");
     
        okButton.setActionCommand(OK);
        okButton.addActionListener(this);
        p.add(okButton);
        return p;
    }
    public void actionPerformed(ActionEvent e) {
        String cmd = e.getActionCommand();
        if (OK.equals(cmd)) {
            char[] input = passwordField.getPassword();
            char[] userinput = usernameField.getPassword();
                if (isUsernameCorrect(userinput) && isPasswordCorrect(input)) {
                    JOptionPane.showMessageDialog(controllingFrame,
                        "Richtig!");
                    controllingFrame.setVisible(false);
                    Main programobject = new Main();
                    programobject.mainprogram();
                 
                } else {
                if (t == 2 ) {
                    t--;
                    JOptionPane.showMessageDialog(controllingFrame,
                        "Falscher Username oder falsches Passwort. Noch " + t + " Versuch.");
  
                Arrays.fill(input, '0');
  
                usernameField.selectAll();
                resetFocus();
                 
                } else {
                    if(t==1) {
                     
                        JOptionPane.showMessageDialog(controllingFrame,
                                "Keine Versuche verbleibend!");
                        System.exit(ERROR);
                    } else {
                        t--;
                        JOptionPane.showMessageDialog(controllingFrame,
                            "Falscher Username oder falsches Passwort. Noch " + t + " Versuche.");
      
                    Arrays.fill(input, '0');
      
                    usernameField.selectAll();
                    resetFocus();
                    }
                }
             } } else {
        
        }
    }
    private static boolean isPasswordCorrect(char[] input) {
        boolean isCorrect = true;
        char[] correctPassword = { 'b', 's', 'p' };
        if (input.length != correctPassword.length) {
            isCorrect = false;
        } else {
            isCorrect = Arrays.equals (input, correctPassword);
        }

        Arrays.fill(correctPassword,'0');
        return isCorrect;
    }
    protected void resetFocus() {
        usernameField.requestFocusInWindow();
    }
 
    private static boolean isUsernameCorrect(char[] userinput) {
        boolean isCorrect = true;
        char[] correctPassword = { 'b', 's', 'p' };
        if (userinput.length != correctPassword.length) {
            isCorrect = false;
        } else {
            isCorrect = Arrays.equals (userinput, correctPassword);
        }

        Arrays.fill(correctPassword,'0');
        return isCorrect;
    }
 
    private static void createAndShowGUI() {

        JFrame frame = new JFrame("Einloggen");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        final Prog newContentPane = new Prog(frame);
        newContentPane.setOpaque(true);
        frame.setContentPane(newContentPane);
        frame.addWindowListener(new WindowAdapter() {
            public void windowActivated(WindowEvent e) {
                newContentPane.resetFocus();
            }
        });
     

        //Fenster sichtbar machen.
        frame.pack();
        frame.setVisible(true);
    }
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
        UIManager.put("swing.boldMetal", Boolean.FALSE);
        createAndShowGUI();
            }
        });
    }
}

Beispielklasse2:

package de.beispielnutzer.Beispielklasse2;

import java.awt.Dimension;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;

import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Beispielklasse2 {
    Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
    int width = (int) size.getWidth();
    int height = (int) size.getHeight();
    int pwidth= (int) width/2;
    int pheight = (int) height/2;
    int x = (int) width/4;
    int y = (int) height/4;
  
    public static String SMALL = "small";
    public static String CLOSE = "close";
    public static String SETTINGS = "settings";
  
    public Main() {
    }
  
    public void mainprogram() {
      
        JFrame program = new JFrame("Beispielprogramm");
        program.setVisible(true);
        program.setBounds(480, 270, 960, 540);
      
      
        JPanel homePanel = new JPanel();
        homePanel.setLayout(null);
        program.add(homePanel);
      
        JButton settingsButton = new JButton();
        settingsButton.setIcon(new ImageIcon("img/wheel.png"));
        settingsButton.setBounds(880, 15, 50, 50);
        settingsButton.setBorder(BorderFactory.createEmptyBorder());
        settingsButton.setContentAreaFilled(false);
        settingsButton.setActionCommand(SETTINGS);
        settingsButton.setVisible(true);
        homePanel.add(settingsButton);
      
        JButton greySettingsButton = new JButton();
        greySettingsButton.setIcon(new ImageIcon("img/greyWheel.png"));
        greySettingsButton.setBounds(880, 15, 50, 50);
        greySettingsButton.setBorder(BorderFactory.createEmptyBorder());
        greySettingsButton.setContentAreaFilled(false);
        greySettingsButton.setActionCommand(SETTINGS);
        greySettingsButton.setVisible(true);
      
        JButton closeButton = new JButton();
        closeButton.setIcon(new ImageIcon("img/close.png"));
        closeButton.setBounds(810, 15, 50, 50);
        closeButton.setBorder(BorderFactory.createEmptyBorder());
        closeButton.setContentAreaFilled(false);
        closeButton.setActionCommand(CLOSE);
        homePanel.add(closeButton);
      
        JButton smallButton = new JButton();
        smallButton.setIcon(new ImageIcon("img/small.png"));
        smallButton.setBounds(715, 15, 80, 50);
        smallButton.setBorder(BorderFactory.createEmptyBorder());
        smallButton.setContentAreaFilled(false);
        smallButton.setActionCommand(SMALL);
        homePanel.add(smallButton);
      
        JLabel homeLabel = new JLabel("Home");
        homeLabel.setBounds(150, 5, 300, 80);
        homeLabel.setFont(new Font("BankGothic Md BT Mittel", 0, 60));
        homePanel.add(homeLabel);
      
      
        JPanel settingsPanel = new JPanel();
        settingsPanel.setLayout(null);
        settingsPanel.setVisible(false);
        settingsPanel.add(smallButton);
        settingsPanel.add(closeButton);
        settingsPanel.add(greySettingsButton);
        program.add(settingsPanel);
      
        JLabel settingsLabel = new JLabel("Settings");
        settingsLabel.setBounds(150, 5, 500, 80);
        settingsLabel.setFont(new Font("BankGothic Md BT Mittel", 0, 60));
        settingsPanel.add(settingsLabel);
      
        JLabel windowNameLabel = new JLabel("Window Name:");
      
        JTextField windowName = new JTextField();
      
      
      
      
        ImageIcon box = new ImageIcon ("img/box.png");
        JLabel boxLabel = new JLabel (box);
        boxLabel.setBounds(-40, 60, 1920, 1080);
        homePanel.add(boxLabel);
      
      
      
      
    }
      
    public void actionPerformed(ActionEvent e) {
        String cmd = e.getActionCommand();
   
        if(SETTINGS.equals(cmd)) {
          
        } else {
            if(CLOSE.equals(cmd)) {
              
            } else {
                if(SMALL.equals(cmd)) {
                  
                }
            }
        }

    }
  
  
  
}

 

[mihe7]

1. https://www.java-forum.org/thema/mehrere-jpanels-auf-ein-jframe-hinzufuegen.181879/
2. Hinzufügen, bevor JFrame sichtbar gemacht wird.
3. Du solltest schon die Klassen mit ihren richtigen Namen posten.