Develop Reference

Why doesn't a panel with GridBagLayout show the content?

I wrote a little something here. It's working if I don't backPanel.setLayout(new GridBagLayout);
But without the grid bag, the content stays in the top left I maximise the screen.
With the grid bag I only get the red backPanel in the frame. Well, there is a gray pixel in the middle of the screen. I'm assuming that's my panel, but I can't make it bigger. I tried setSize but it doesn't change. Also, I had the panel.setBounds(0, 0, getWidth(),getHeight());. I'm not sure why I removed it.
My main is in the other file. The only thing it does at the moment is to call the LoginFrame.
Here is the code:
package first;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
public class LoginFrame extends JFrame implements ActionListener {
private JTextField textField;
private JPasswordField passwordField;
public LoginFrame() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(500, 300);
JPanel backPanel = new JPanel(new GridBagLayout());
backPanel.setBackground(Color.RED);
JPanel panel = new JPanel();
panel.setSize(500, 300);
panel.setBackground(Color.LIGHT_GRAY);
panel.setLayout(null);
JLabel label;
panel.add(label = new JLabel("Username:"));
label.setBounds(20, 100, 100, 25);
panel.add(textField = new JTextField());
textField.setBounds(140, 100, 200, 25);
panel.add(label = new JLabel("Password:"));
label.setBounds(20, 145, 100, 25);
panel.add(passwordField = new JPasswordField());
passwordField.setBounds(140, 145, 200, 25);
panel.add(label = new JLabel("CTC Bank"));
label.setFont(new Font("New Times Roman", Font.BOLD, 50));
label.setBounds(0, 0, getWidth(), 100);
label.setHorizontalAlignment(JLabel.CENTER);
JButton button;
panel.add(button = new JButton("Login"));
button.setBounds(140, 200, 100, 25);
button.addActionListener(this);
button = defaultActionKeyEnter(button, KeyEvent.VK_ENTER);
panel.add(button = new JButton("Register"));
button.setBounds(240, 200, 100, 25);
button.addActionListener(this);
button = defaultActionKeyEnter(button, KeyEvent.VK_ENTER);
//add(panel);
backPanel.add(panel);
add(backPanel, BorderLayout.CENTER);
revalidate();
repaint();
setLocationRelativeTo(null);
setVisible(true);
}
public static JButton defaultActionKeyEnter(JButton button, int desiredKeyCode) {
InputMap inputMap = button.getInputMap(JComponent.WHEN_FOCUSED);
KeyStroke spaceKeyPressed = KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0, false);
KeyStroke spaceKeyReleased = KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0, true);
KeyStroke desiredKeyPressed = KeyStroke.getKeyStroke(desiredKeyCode, 0, false);
KeyStroke desiredKeyReleased = KeyStroke.getKeyStroke(desiredKeyCode, 0, true);
inputMap.put(desiredKeyPressed, inputMap.get(spaceKeyPressed));
inputMap.put(desiredKeyReleased, inputMap.get(spaceKeyReleased));
inputMap.put(spaceKeyPressed, "none");
inputMap.put(spaceKeyReleased, "none");
return button;
}
// Unfinished code dont worry bout it...
#Override
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("Login")) {
if (textField.getText().equals("Heinz")
&& (new String(passwordField.getPassword()).equals("password123"))) {
// color = Color.GREEN;
} else {
JOptionPane.showMessageDialog(this, "Wrong Username or Password", "Error", JOptionPane.WARNING_MESSAGE);
// color = Color.RED;
}
} else {
JOptionPane.showMessageDialog(this, "Cya");
dispose();
setVisible(false);
}
// panel.setBackground(color);
}
}
I have seen questions about this but none of the answers were helpful in my case.
Calling the following didn't help.
revalidate();
repaint();
Did I maybe add it in the wrong order?
And how does the code look like to you? Would you consider this clean?

The layout of backPanel will mis-calculate the dimensions of "panel" because "panel" does not participate in layout management properly, without a layout manager of its own.
One solution to this is to use setLayout(null) also on the "backPanel", or add "panel" directly to the JFrame.
With the first suggestion ("backPanel.setLayout(null);" just after it is created), plus the following main method:
public static void main(String[] args) {
new LoginFrame();
}
I get this:

Components appear only when mouse hovers over them

I created a JFrame with the Swing framework, in which I added a JButton that will display a form created on a JPanel on the frame.
I added the action listener on the button and it is displaying panel as I expected;
But the boxes of components like radio buttons and checkboxes cannot be seen.
They appear only when I hover mouse over them.
Look at the other option in radio button and checkboxes:
Here is the code:
package codes;
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
public class JFrameBackground extends JFrame implements ActionListener
{
private static final long serialVersionUID = 1L;
JLabel l1,l2,l3,l4;
JTextField t1;
JButton b1;
JRadioButton r1;
JComboBox com1;
JCheckBox chk1;
JPanel p2;
JButton b;
public JFrameBackground()
{
p2=new JPanel();
p2.setLayout(null);
p2.setBounds(250, 0, 400, 400);
add(p2);
l1 = new JLabel("Name:");
l1.setBounds(100,10,70,30);
p2.add(l1);
t1 = new JTextField();
t1.setBounds(100,50,70,30);
p2.add(t1);
l2 = new JLabel("Gender:");
l2.setBounds(100,130,70,30);
p2.add(l2);
r1 = new JRadioButton("Male");
r1.setBounds(100,150,70,30);
p2.add(r1);
r1 = new JRadioButton("Female");
r1.setBounds(150,150,70,30);
p2.add(r1);
l3 = new JLabel("Course:");
l3.setBounds(100,180,70,30);
p2.add(l3);
chk1= new JCheckBox("Bca");
chk1.setBounds(100, 200, 70, 30);
p2.add(chk1);
chk1= new JCheckBox("BBA");
chk1.setBounds(150, 200, 70, 30);
p2.add(chk1);
chk1= new JCheckBox("BCOM");
chk1.setBounds(200, 200, 70, 30);
p2.add(chk1);
l4 = new JLabel("Country:");
l4.setBounds(100,220,70,30);
p2.add(l4);
String name[] = {"India","USA","UK","Rus"};
com1=new JComboBox(name);
com1.setBounds(100, 250, 70, 30);
p2.add(com1);
b1= new JButton("Submit");
b1.setBounds(140, 300, 90, 30);
p2.add(b1);
b =new JButton("Show form");
b.setBounds(0, 4, 190, 40);
b.setFocusPainted(false);
b.setBorderPainted(false);
b.addActionListener(this);
add(b);
b.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent me)
{
p2.setVisible(true);
}
});
Container c=getContentPane();
c.setBackground(Color.gray);
setBounds(170, 100, 1250, 500);
setLayout(null);
setVisible(true);
}
public static void main(String[] args)
{
new JFrameBackground();
}
public void actionPerformed(ActionEvent arg0)
{
}
}

This seems to work better.
I fixed radiobutton and checkbox positions.
I used different references for checkbox and radiobutton objects (r1, r2, chk1, chk2, chk3)
I added a buttongroup for radiobuttons.
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.ButtonGroup;
public class JFrameBackground extends JFrame implements ActionListener
{
private static final long serialVersionUID = 1L;
JLabel l1,l2,l3,l4;
JTextField t1;
JButton b1;
JRadioButton r1, r2;
JComboBox com1;
JCheckBox chk1, chk2, chk3;
JPanel p2;
JButton b;
public JFrameBackground()
{
p2=new JPanel();
p2.setLayout(null);
p2.setBounds(250, 0, 400, 400);
add(p2);
l1 = new JLabel("Name:");
l1.setBounds(100,10,70,30);
p2.add(l1);
t1 = new JTextField();
t1.setBounds(100,50,70,30);
p2.add(t1);
l2 = new JLabel("Gender:");
l2.setBounds(100,130,70,30);
p2.add(l2);
r1 = new JRadioButton("Male");
r1.setBounds(100,150,70,30);
p2.add(r1);
r2 = new JRadioButton("Female");
r2.setBounds(180,150,70,30);
p2.add(r2);
ButtonGroup bg=new ButtonGroup();
bg.add(r1);
bg.add(r2);
l3 = new JLabel("Course:");
l3.setBounds(100,180,70,30);
p2.add(l3);
chk1= new JCheckBox("Bca");
chk1.setBounds(100, 200, 70, 30);
p2.add(chk1);
chk2= new JCheckBox("BBA");
chk2.setBounds(180, 200, 70, 30);
p2.add(chk2);
chk3= new JCheckBox("BCOM");
chk3.setBounds(260, 200, 70, 30);
p2.add(chk3);
l4 = new JLabel("Country:");
l4.setBounds(100,220,70,30);
p2.add(l4);
String name[] = {"India","USA","UK","Rus"};
com1=new JComboBox(name);
com1.setBounds(100, 250, 70, 30);
p2.add(com1);
b1= new JButton("Submit");
b1.setBounds(140, 300, 90, 30);
p2.add(b1);
b =new JButton("Show form");
b.setBounds(0, 4, 190, 40);
b.setFocusPainted(false);
b.setBorderPainted(false);
b.addActionListener(this);
getContentPane().add(b);
b.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent me)
{
p2.setVisible(true);
}
});
Container c=getContentPane();
c.setBackground(Color.gray);
setBounds(170, 100, 1250, 500);
setLayout(null);
setVisible(true);
}
public static void main(String[] args)
{
new JFrameBackground();
}
public void actionPerformed(ActionEvent arg0)
{
}
}

The Components to the left are too large and therefore overlap the checkboxes. Thats why they are not shown correctly. So move the right components like that:
r1.setBounds(170, 150, 70, 30);
chk1.setBounds(170, 200, 70, 30);
chk1.setBounds(240, 200, 70, 30);
and it will work.

JPanel gets compressed and disappears when trying to move to the bottom

I have to do a project in Java and thought a GUI Text Adventure would be cool. My Problem is that when I create a JPanel and move it further down on the screen, the panel first changes its size and then disappears completely at one point.
On the GameScreen there should be a panel for choice Options to be put on but it refuses to go further down than about half the size of the Screen.
Here's the code:
import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class Yeet {
JFrame epicOfYeet;
Container con;
JPanel titleNamePanel, startButtonPanel, mainTextPanel, choiceButtonPanel;
JLabel titleNameLabel;
Font titleFont = new Font("Times New Roman", Font.PLAIN, 90);
Font normalFont = new Font ("Times New Roman", Font.PLAIN, 55);
JButton startButton;
JButton choice1;
JButton choice2;
JButton choice3;
JButton choice4;
JTextArea mainTextArea;
TitleScreenHandler tsHandler = new TitleScreenHandler();
public static void main(String[] args) {
new Yeet();
}
public Yeet() {
epicOfYeet = new JFrame();
epicOfYeet.setSize(1200, 1000);
epicOfYeet.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
epicOfYeet.getContentPane().setBackground(Color.black);
epicOfYeet.setLayout(null);
con = epicOfYeet.getContentPane();
titleNamePanel = new JPanel();
titleNamePanel.setBounds(190, 100, 800, 230);
titleNamePanel.setBackground(Color.black);
titleNameLabel = new JLabel("EPIC OF YEET");
titleNameLabel.setForeground(Color.red);
titleNameLabel.setFont(titleFont);
startButtonPanel = new JPanel();
startButtonPanel.setBounds(400, 500, 400, 100);
startButtonPanel.setBackground(Color.black);
startButton = new JButton("START");
startButton.setBackground(Color.black);
startButton.setForeground(Color.white);
startButton.setFont(normalFont);
startButton.addActionListener(tsHandler);
startButton.setFocusPainted(false);
titleNamePanel.add(titleNameLabel);
startButtonPanel.add(startButton);
con.add(titleNamePanel);
con.add(startButtonPanel);
epicOfYeet.setVisible(true);
}
public void createGameScreen(){
titleNamePanel.setVisible(false);
startButtonPanel.setVisible(false);
mainTextPanel = new JPanel();
mainTextPanel.setBounds(100, 100, 1000, 400);
mainTextPanel.setBackground(Color.green);
con.add(mainTextPanel);
mainTextArea = new JTextArea("You come to your senses again.\nThe dewy grass you're laying on is gleaming with moonlight.\nYour body aches as you get up and catch a \nglimpse of your surroundings.\n");
mainTextArea.setBounds(100, 100, 1000, 250);
mainTextArea.setBackground(Color.blue);
mainTextArea.setForeground(Color.white);
mainTextArea.setFont(normalFont);
mainTextArea.setLineWrap(true);
mainTextPanel.add(mainTextArea);
choiceButtonPanel = new JPanel();
choiceButtonPanel.setBounds(300, 500, 600, 550);
choiceButtonPanel.setBackground(Color.red);
con.add(choiceButtonPanel);
}
public class TitleScreenHandler implements ActionListener{
#Override
public void actionPerformed(ActionEvent event) {
createGameScreen();
}
}
}

Here is a basic implementation using layout mangers, avoiding the bad practice of null layout manager.
It is not an optimal one, but should get you started:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class Yeet {
JFrame epicOfYeet;
Container con;
JPanel titleNamePanel, startButtonPanel, mainTextPanel, choiceButtonPanel;
JLabel titleNameLabel;
Font titleFont = new Font("Times New Roman", Font.PLAIN, 90);
Font normalFont = new Font ("Times New Roman", Font.PLAIN, 55);
JButton startButton, coice1, choice2, choice3, choice4;
JTextArea mainTextArea;
TitleScreenHandler tsHandler = new TitleScreenHandler();
public static void main(String[] args) {
SwingUtilities.invokeLater(()->new Yeet());
}
public Yeet() {
epicOfYeet = new JFrame();
//epicOfYeet.setSize(1200, 1000); // do not set size. let layout manager calcualte it
epicOfYeet.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
epicOfYeet.getContentPane().setBackground(Color.black);
//epicOfYeet.setLayout(null); //aviod null layouts Jframe uses BorderLayout by default
con = epicOfYeet.getContentPane();
titleNamePanel = new JPanel();
//titleNamePanel.setBounds(190, 100, 800, 230);
titleNamePanel.setPreferredSize(new Dimension(800, 230));//set preferred size to be used by layout manager
titleNamePanel.setBackground(Color.black);
titleNameLabel = new JLabel("EPIC OF YEET");
titleNameLabel.setForeground(Color.red);
titleNameLabel.setFont(titleFont);
startButtonPanel = new JPanel();
//startButtonPanel.setBounds(400, 500, 400, 100);
startButtonPanel.setPreferredSize(new Dimension(400, 100));
startButtonPanel.setBackground(Color.black);
startButton = new JButton("START");
startButton.setBackground(Color.black);
startButton.setForeground(Color.white);
startButton.setFont(normalFont);
startButton.addActionListener(tsHandler);
startButton.setFocusPainted(false);
titleNamePanel.add(titleNameLabel);
startButtonPanel.add(startButton);
con.add(titleNamePanel, BorderLayout.PAGE_START); //set to top
con.add(startButtonPanel, BorderLayout.PAGE_END); //set to bottom
epicOfYeet.pack();
epicOfYeet.setVisible(true);
}
public void createGameScreen(){
//titleNamePanel.setVisible(false);
//startButtonPanel.setVisible(false);
con.remove(titleNamePanel);
con.remove(startButtonPanel);
mainTextPanel = new JPanel();
//mainTextPanel.setBounds(100, 100, 1000, 400);
mainTextPanel.setBackground(Color.green);
con.add(mainTextPanel); // added to center position of the BorderLayout (the default)
mainTextArea = new JTextArea(10, 20); //size in rows, cols
mainTextArea.setText("You come to your senses again.\nThe dewy grass you're laying on is gleaming with moonlight.\nYour body aches as you get up and catch a \nglimpse of your surroundings.\n");
//mainTextArea.setBounds(100, 100, 1000, 250);
mainTextArea.setBackground(Color.blue);
mainTextArea.setForeground(Color.white);
mainTextArea.setFont(normalFont);
mainTextArea.setLineWrap(true);
mainTextPanel.add(mainTextArea);
choiceButtonPanel = new JPanel();
//choiceButtonPanel.setBounds(300, 500, 600, 550);
choiceButtonPanel.setPreferredSize(new Dimension(600, 550));
choiceButtonPanel.setBackground(Color.red);
con.add(choiceButtonPanel, BorderLayout.PAGE_END);//add to bottom
epicOfYeet.pack();
}
public class TitleScreenHandler implements ActionListener{
#Override
public void actionPerformed(ActionEvent event) {
createGameScreen();
}
}
}

CardLayout showing blank JPanel in Java

I've searched up different tutorials and looked at the Class Profile for CardLayout and JPanel but I can't seem to get my window to show up. Currently it opens a frame with the proper dimensions and title but nothing in the actual container.
This is the code I have(P.S. I know it's a hot mess)
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
public class Casino extends JFrame implements ActionListener {
private JButton start, settings, scenario, music;
/**
* Constructor method
*/
public Casino(){
JPanel mainUI, startUI, settingsUI, scenarioUI, blackjackUI, oddorevenUI, tcmUI, overorunderUI, slotsUI;
JPanel menus = new JPanel(new CardLayout());
CardLayout GUI = (CardLayout) menus.getLayout();
mainUI = new JPanel();
getContentPane().add(mainUI);
mainUI.setBackground(new Color(53, 9, 9));
//Background items
JLabel title = new JLabel(new ImageIcon("title.png"));
title.setBounds(0,-280,780,700);
mainUI.add(title);
JLabel border = new JLabel(new ImageIcon("mainscreenborder.png"));
border.setBounds(0, 180, 780, 700);
mainUI.add(border);
//Main menu buttons
settings = new JButton();
ImageIcon s = new ImageIcon("settings-button.png");
settings.setBounds(320, 200, 122, 63);
settings.setIcon(s);
mainUI.add(settings);
music = new JButton();
ImageIcon m = new ImageIcon("music-button.png");
music.setBounds(320, 268, 122, 63);
music.setBackground(new Color(53, 9, 9));
music.setIcon(m);
mainUI.add(music);
scenario = new JButton();
ImageIcon sc = new ImageIcon("scenario-button.png");
scenario.setBounds(320, 336, 122, 63);
scenario.setBackground(new Color(53, 9, 9));
scenario.setIcon(sc);
mainUI.add(scenario);
start = new JButton();
ImageIcon st = new ImageIcon("start-button.png");
start.setBounds(320, 404, 122, 63);
start.setBackground(new Color(53, 9, 9));
start.setIcon(st);
mainUI.add(start);
menus.add(mainUI, "Main Menu");
GUI.show(menus, "Main Menu");
setSize(780, 700);
setResizable(false);
setLayout(GUI);
setTitle("White Lily Casino");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}
public void actionPerformed(ActionEvent e){
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Casino wlc = new Casino();
}
}
Note: It worked before when I was using the Container c method instead of using a JPanel and CardLayout. I am trying to switch it to card layout now because I want to use buttons to navigate to multiple screens

Try adding the mainUI to the JFrame
getContentPane().add(mainUI)
or
add(mainUI)

How do I set an image to a background

I'm trying to create a simple JFrame with the content pane JPanel. I want to know how to set an IMAGE as a background. I know that a lot of people have a already asked this, but I get unresolved compilation errors whenever I try.
In the end, I created a whole new class in my class, but that had errors too.
How do I do this? Please help.
package menu;
import java.awt.Color;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.ImageObserver;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
import models.AskTheAdmiralFrame;
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Image;
/**
*
* #author Russell
*
*/
public class HistoraskMenu extends JFrame {
private static final long serialVersionUID = 8106152174535131551L;
private static JPanel panel;
private JButton ATA = new JButton("Ask The Admiral");
public Color oldPaper = new Color(255, 230, 179);
private JLabel label = new JLabel();
private final JLabel label_1 = new JLabel("");
private final ImageIcon bg = new ImageIcon("/Users/Russell/Desktop/Russell/Java/Coding"
+ "/eclipse workspace/Historask/resources/bg.jpg");
Image img = bg.getImage();
public HistoraskMenu(){
setBounds(50, 50, 700, 500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Historask");
panel = new JPanel();
setContentPane(panel);
label.setHorizontalAlignment(SwingConstants.CENTER); //Sets position of Historask sign
label.setVerticalAlignment(SwingConstants.TOP);
label.setBackground(new Color(238, 232, 170)); //Sets the colour of the foreground and background of Historask sign
label.setForeground(oldPaper);
label.setIcon(new ImageIcon("/Users/Russell/Desktop/Russell/Java/Coding"
+ "/eclipse workspace/Historask/resources/title.png"));
label.setOpaque(true);
label.setBounds(50, 10, 500, 50);
getContentPane().add(label);
panel.add(label_1);
ATA.addMouseListener(new MouseAdapter() {
#Override
public void mousePressed(MouseEvent e) { //What happens when you press ATA button
new AskTheAdmiralFrame();
}
});
getContentPane().add(ATA);
setVisible(true);
}
public class panel extends JPanel{
setLayout(new GridLayout(0, 1, 0, 0));
public void paintComponent(Graphics g) {
g.drawImage(img, 0, 0, this);
super.paintComponents(g);
}
}

If you are referring to panel object in the HistoraskMenu() constructor it wont draw image because you are innitializing this to JPanel directly. Rather try panel = new panel();