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Is it possible to split initialize section into different classes?

I have been working on some side project involving MySQL, with will use tree different screens: 'menu, ' add breed', 'browse breed'.
At this point section initialize is getting quite large and I would like to split it into 3 different classes.
Is it possible to initialize for example JPanel outside Window class?
public class Window {
public static void setBreed()
{
for(int i=0; i<16;i++) {
breedLabels[i].setText(breedInfo[i]);
breedLabels[i].setBounds(600,100+i*30,300, 100);
breedLabels[i].setFont(new Font("Verdana", Font.PLAIN, 20));
viewBreed.add(breedLabels[i]);
}
}
public static void setText()
{
for(int i=0; i<16;i++) {
textLabels[i].setText(text[i]);
textLabels[i].setBounds(300,100+i*30,300, 100);
textLabels[i].setFont(new Font("Verdana", Font.PLAIN, 20));
viewBreed.add(textLabels[i]);
}
}
public static String URL = "jdbc:mysql://localhost:3306/chooseyourpuppy";
public static String user = "root";
public static String password = "";
public static String query = "select * from breeds";
static String [] breedInfo = new String[16];
static String [] text = new String[16];
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Window window = new Window();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
View.connect(URL, user, password, query);
}
public Window() {
initialize();
}
private JFrame frame;
public JPanel addBreed;
public static JPanel viewBreed;
public JPanel menu;
public static JLabel[] textLabels;
public static JLabel[] breedLabels;
private void initialize() {
final int WIDTH = 1280, HEIGHT = 720;
frame = new JFrame();
frame.getContentPane().setBackground(Color.WHITE);
frame.getContentPane().setLayout(null);
frame.setBounds(100, 100, WIDTH, HEIGHT);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("MyBREEDS Viewer");
frame.setResizable(false);
frame.setVisible(true);
//header
JPanel red = new JPanel();
red.setBounds(400, 0, 888, 80);
frame.getContentPane().add(red);
red.setBackground(new Color(204, 0, 0));
red.setLayout(null);
JPanel darkGrey = new JPanel();
darkGrey.setBounds(0, 0, 387, 80);
frame.getContentPane().add(darkGrey);
darkGrey.setBackground(new Color(51, 51, 51));
darkGrey.setLayout(null);
JLabel txtpnChoose = new JLabel();
txtpnChoose.setForeground(new Color(240, 240, 240));
txtpnChoose.setBounds(56, 11, 367, 63);
txtpnChoose.setFont(new Font("Verdana", Font.BOLD, 46));
txtpnChoose.setText("Choose your");
txtpnChoose.setBackground(null);
darkGrey.add(txtpnChoose);
JLabel txtpnPuppy = new JLabel();
txtpnPuppy.setBounds(5, 11, 166, 63);
txtpnPuppy.setForeground(new Color(240, 240, 240));
txtpnPuppy.setFont(new Font("Nunito-Bold", Font.BOLD, 46));
txtpnPuppy.setText("puppy");
txtpnPuppy.setBackground(null);
red.add(txtpnPuppy);
JLayeredPane layeredPane = new JLayeredPane();
layeredPane.setBounds(0, 0, WIDTH, HEIGHT);
frame.getContentPane().add(layeredPane);
layeredPane.setLayout(new CardLayout(0, 0));
JButton btnMenu = new JButton("Back to menu");
btnMenu.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
layeredPane.removeAll();
layeredPane.add(menu);
layeredPane.repaint();
layeredPane.revalidate();
}
});
btnMenu.setForeground(Color.WHITE);
btnMenu.setBackground(new Color(51, 51, 51));
btnMenu.setFont(new Font("Verdana", Font.BOLD, 18));
btnMenu.setBounds(660, 20, 180, 40);
btnMenu.setBorderPainted(false);
btnMenu.setFocusPainted(false);
red.add(btnMenu);
//menu
menu = new JPanel();
menu.setBackground(Color.WHITE);
layeredPane.add(menu, "name_410359960271086");
menu.setLayout(null);
JButton btnBrowse = new JButton("Browse breeds");
btnBrowse.setBounds(100, 300, 400, 200);
btnBrowse.setFont(new Font("Verdana", Font.PLAIN, 40));
btnBrowse.setBorder(new LineBorder(Color.DARK_GRAY));
btnBrowse.setBorder(BorderFactory.createStrokeBorder(new BasicStroke(5.0f)));
btnBrowse.setBackground(Color.WHITE);
btnBrowse.setRequestFocusEnabled(false);
btnBrowse.setVisible(true);
btnBrowse.setFocusPainted(false);
btnBrowse.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
layeredPane.removeAll();
layeredPane.add(viewBreed);
layeredPane.repaint();
layeredPane.revalidate();
setText();
setBreed();
}
});
btnBrowse.addMouseListener(new MouseAdapter() {
#Override
public void mouseEntered(MouseEvent e) {
btnBrowse.setBackground(new Color(237, 237, 237));
}
#Override
public void mouseExited(MouseEvent e) {
btnBrowse.setBackground(Color.WHITE);
}
});
menu.add(btnBrowse);
addBreed = new JPanel();
layeredPane.add(addBreed, "name_410359942089403");
addBreed.setVisible(false);
addBreed.setBackground(Color.WHITE);
addBreed.setLayout(null);
//view breed window
viewBreed = new JPanel();
layeredPane.add(viewBreed, "name_410359924014670");
viewBreed.setLayout(null);
viewBreed.setVisible(false);
viewBreed.setBackground(Color.WHITE);
ImageIcon previous = new ImageIcon("src/images/previous.png");
ImageIcon previousHover = new ImageIcon("src/images/previousHover.png");
JButton prevBreed = new JButton(previous);
prevBreed.addMouseListener(new MouseAdapter() {
#Override
public void mouseEntered(MouseEvent e) {
prevBreed.setIcon(previousHover);
}
#Override
public void mouseExited(MouseEvent e) {
prevBreed.setIcon(previous);
}
});
prevBreed.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
View.changeBreed(false);
}
});
prevBreed.setBounds(30, 300, previous.getIconHeight(), previous.getIconWidth());
viewBreed.add(prevBreed);
prevBreed.setRequestFocusEnabled(false);
prevBreed.setOpaque(false);
prevBreed.setContentAreaFilled(false);
prevBreed.setBorderPainted(false);
prevBreed.setFocusPainted(false);
ImageIcon next = new ImageIcon("src/images/next.png");
ImageIcon nextHover = new ImageIcon("src/images/nextHover.png");
JButton nextBreed = new JButton(next);
nextBreed.addMouseListener(new MouseAdapter() {
#Override
public void mouseEntered(MouseEvent e) {
nextBreed.setIcon(nextHover);
}
#Override
public void mouseExited(MouseEvent e) {
nextBreed.setIcon(next);
}
});
nextBreed.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
View.changeBreed(true);
}
});
nextBreed.setBounds(1140, 300, previous.getIconHeight(), previous.getIconWidth());
viewBreed.add(nextBreed);
nextBreed.setRequestFocusEnabled(false);
nextBreed.setVisible(true);
nextBreed.setOpaque(false);
nextBreed.setContentAreaFilled(false);
nextBreed.setBorderPainted(false);
nextBreed.setFocusPainted(false);
//add breed window
JButton btnAdd = new JButton("Add new breed");
btnAdd.setBounds(780, 300, 400, 200);
btnAdd.setFont(new Font("Verdana", Font.PLAIN, 40));
btnAdd.setBorder(new LineBorder(Color.DARK_GRAY));
btnAdd.setBorder(BorderFactory.createStrokeBorder(new BasicStroke(5.0f)));
btnAdd.setBackground(Color.WHITE);
btnAdd.setRequestFocusEnabled(false);
btnAdd.setFocusPainted(false);
btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
layeredPane.removeAll();
layeredPane.add(addBreed);
layeredPane.repaint();
layeredPane.revalidate();
}
});
btnAdd.addMouseListener(new MouseAdapter() {
#Override
public void mouseEntered(MouseEvent e) {
btnAdd.setBackground(new Color(237, 237, 237));
}
#Override
public void mouseExited(MouseEvent e) {
btnAdd.setBackground(Color.WHITE);
}
});
menu.add(btnAdd);
breedLabels = new JLabel[breedInfo.length];
for(int i=0; i<breedInfo.length; i++) {
breedLabels[i] = new JLabel(breedInfo[i]);
}
textLabels = new JLabel[breedInfo.length];
for(int i=0; i<breedInfo.length; i++) {
textLabels[i] = new JLabel(breedInfo[i]);
}
}
}

Is it possible to initialize for example JPanel outside Window class?"
Yes. A different class might contain a method that creates & returns a JPanel.
Other tips:
Java GUIs have to work on different OS', screen size, screen resolution etc. using different PLAFs in different locales. As such, they are not conducive to pixel perfect layout. Instead use layout managers, or combinations of them along with layout padding and borders for white space.
Application resources will become embedded resources by the time of deployment, so it is wise to start accessing them as if they were, right now. An embedded-resource must be accessed by URL rather than file. See the info. page for embedded resource for how to form the URL.
new Font("Verdana", Font.PLAIN, 20) Use defaults or logical fonts (E.G. Font.SERIF) unless the font is supplied with your app. as an embedded resource.
The loop and array of labels that are added to viewBreed suggest it should be a JList rather than a JPanel
layeredPane.removeAll(); .. Ugh.. Use a CardLayout as shown in this answer.
What is the purpose of the JLayeredPane? I expect it's unnecessary purely on the basis that there is so little use for them.

JButton is not adding

I'm not sure why my JButton is not displaying when I add it to the JPanel class: if my class extends JPanel, shouldn't this.add be sufficient? And if I remove this Jpanel class from another Jpanel, the components attached to this panel should disappear as well right? Thank you!
public class Menu extends JPanel{
private static final long serialVersionUID = 1L;
static boolean startGame = false;
public static String user;
public Menu(final JFrame frame) {
JPanel userName = new JPanel(); // create new JPanel
final JTextField text = new JTextField();
text.setText("input your username here");
//adds userName input box to the panel
Action action = new AbstractAction(){
private static final long serialVersionUID = 1L;
#Override
public void actionPerformed(ActionEvent e) {
user = text.getText();
text.setVisible(false);
Menu.startGame = true;
}};
text.addActionListener(action);
userName.add(text);
frame.add(userName, BorderLayout.SOUTH);
frame.revalidate();
frame.repaint();
setFocusable(true);
addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
sndMenu newMenu = new sndMenu(frame);
newMenu.setVisible(true);
}
});
/**
* this does not display help!
*/
//add a button to the menu called "help"
JButton help = new JButton("get instructions");
this.add(help,BorderLayout.CENTER);
help.setVisible(true);
help.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
instructions instr = new instructions(frame);
frame.add(instr);
frame.revalidate();
frame.repaint();
}
});
}
public void paint (Graphics g) {
super.paint(g);
g.setColor(Color.black);
g.fillRect(0, 0, Game.WIDTH, Game.HEIGHT);
Font fnt0 = new Font("Manaspace", Font.BOLD, 40);
Font fnt1 = new Font("Manaspace", Font.BOLD, 30);
g.setFont(fnt0);
g.setColor(Color.white);
g.drawString("Welcome To Jumping Box!", 120, 300);
g.setFont(fnt1);
g.drawString("Click to play!", 260, 400);
}
}

Making a keyevent in a JFrame

I'm trying to make a key make something happen in a JFrame. Right now I'm just trying to disable a button when you press the left key, but nothing is happening. I thought I have everything right, but it does nothing.
EDIT: I noticed that when I don't click start first, it works. But after you press start, it won't respond.
Here's my code so far:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MyFrame extends JFrame implements ActionListener, KeyListener
{
private static final long serialVersionUID = 1L;
private JPanel p1;
private JButton b1, b2;
private JLabel lb1;
private int a;
private Font font = new Font("Arial", Font.BOLD, 20);
public MyFrame()
{
setLayout(new FlowLayout());
setSize(700,600);
setVisible(true);
setResizable(false);
addKeyListener(this);
setFocusable(true);
p1 = new JPanel(); add(p1);
p1.setBackground(Color.BLACK);
p1.setPreferredSize(new Dimension(650,500));
p1.setFocusable(true);
b1 = new JButton("Start"); add(b1);
b1.addActionListener(this);
b2 = new JButton("Test"); add(b2);
b2.setFocusable(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent event)
{
Graphics g = p1.getGraphics();
g.setColor(Color.WHITE);
g.fillRect(30, 210, 10, 70);
g.fillRect(620, 210, 10, 70);
for(int i=0; i<7; i++)
{
g.fillRect(325, a, 10, 70);
a += 90;
}
g.setFont(font);
g.drawString("Player 1: ", 120, 20);
g.drawString("Player 2: ", 450, 20);
}
public void keyPressed(KeyEvent e)
{
int d = e.getKeyCode();
if(d==KeyEvent.VK_LEFT)
{
b2.setEnabled(false);
}
}
public void keyReleased(KeyEvent e)
{
}
public void keyTyped(KeyEvent e)
{
}
}
And here's my Main.java file:
public class Main {
public static void main(String[] arg)
{
MyFrame mf = new MyFrame();
}
}

KeyListener has a lot of problems, with regards to focus (among other things). With Swing, it is preferred to use Key Bindings, which gives us more control over the focus options. There are different InputMaps for WHEN_FOCUSED, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_IN_FOCUSED_WINDOW. Their names are almost self documenting. So if we were to do
JPanel panel = (JPanel)frame.getContentPane();
InputMap imap = panel.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
then we are getting the InputMap for when the frame is focused. We would then bind a KeyStroke with an Action to that InputMap and the component's ActionMap. For example
JPanel panel = (JPanel)frame.getContentPane();
InputMap imap = panel.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
imap.put(KeyStroke.getKeyStroke("LEFT"), "leftAction");
ActionMap amap = panel.getActionMap();
Action leftAction = new AbstractAction() {
#Override
public void actionPerformed(ActionEvent e) {
doSomethingWhenLeftIsPressed();
}
};
amap.put("leftAction", leftAction);
Resources
How to use Actions
How to Use Key Bindings

You forgot to tell the JFrame that it should be listening for keys with this line of code:addKeyListener(this);

Clicking on JButton(Bubble Sort) clears the JTextField.Why?

public class Sort_BenchMark extends JFrame {
private JPanel contentPane;
private JTextField textField;
private JButton btnBubbleSort;
private JLabel label_1;
private JButton btnGenerate;
private JButton btnSelectionSort;
private JLabel lblSs;
private JLabel lblStatus;
/**
* Launch the application.
*/
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
try
{
Sort_BenchMark frame = new Sort_BenchMark();
frame.setVisible(true);
}
catch (Exception e)
{
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Sort_BenchMark()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
textField = new JTextField("Enter ");
textField.setForeground(Color.GRAY);
textField.addFocusListener(new FocusListener() {
#Override
public void focusLost(FocusEvent e) {
// TODO Auto-generated method stub
}
#Override
public void focusGained(FocusEvent e) {
textField.setText("");
textField.setForeground(Color.BLACK);
}
});
textField.setBounds(29, 30, 139, 20);
contentPane.add(textField);
textField.setColumns(10);
label_1 = new JLabel("");
label_1.setBounds(334, 20, 120, 30);
contentPane.add(label_1);
btnBubbleSort = new JButton("Bubble Sort");
btnBubbleSort.setBounds(204, 20, 120, 30);
contentPane.add(btnBubbleSort);
btnSelectionSort = new JButton("Selection Sort");
btnSelectionSort.setBounds(204, 70, 120, 30);
contentPane.add(btnSelectionSort);
lblSs = new JLabel("");
lblSs.setBounds(334, 70, 120, 30);
contentPane.add(lblSs);
lblStatus = new JLabel("");
lblStatus.setBounds(75, 87, 93, 23);
contentPane.add(lblStatus);
final JRadioButton rdbtnAvgCase = new JRadioButton("Avg Case");
rdbtnAvgCase.setBounds(29, 150, 109, 23);
contentPane.add(rdbtnAvgCase);
ButtonGroup b = new ButtonGroup();
b.add(rdbtnAvgCase);
btnGenerate = new JButton("Generate");
btnGenerate.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
btnBubbleSort.setEnabled(true);
btnSelectionSort.setEnabled(true);
final String s = textField.getText();
if(s.contentEquals(""))
{
lblStatus.setText("Enter length");
}
else
{
lblStatus.setText("Ready");
if(rdbtnAvgCase.isSelected())
{
btnBubbleSort.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
Thread t1 = new Thread(new Runnable()
{
#Override
public void run()
{
btnBubbleSort.setEnabled(false);
label_1.setText("done");
btnBubbleSort.setEnabled(true);
}
});
t1.start();
}
});
btnSelectionSort.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
Thread t3 = new Thread(new Runnable()
{
#Override
public void run()
{
btnSelectionSort.setEnabled(false);
lblSs.setText("done");
btnSelectionSort.setEnabled(true);
}
});
t3.start();
}
});
}
}
}
});
btnGenerate.setBounds(64, 62, 88, 25);
contentPane.add(btnGenerate);
}
}
The above code is about Swing.
The actual code how i designed is:-(In the frame)
Select the Average Case (RadioButton)
Enter any number in textfield (Enter)
click on generate
click on any sort button(Bubble Sort and Selection Sort)
Now, whats the problem is, If I click on BubbleSort the text field gets cleared. But it should not happen as per I designed. Can anyone suggest me the solution so that text field wont get clear after entered anything in it?

These lines here:
#Override
public void focusGained(FocusEvent e) {
textField.setText(""); //HERE
textField.setForeground(Color.BLACK);
}
in the focus listener code says that when you click in the textfield then set its text to a empty string.

Firstly, horrible nested ActionPerformed you've got there.
That aside, Vincent Ramdhanie is right as to where the problem is originating. The reason why it only happens when you click a certain button, is because when you disable a button, then it cannot have focus, which forces the focus to be on something else, which in the disable-btnBubbleSort's case, appears to be your textfield.
Instead of btnSelectionSort.setEnabled(false) and btnSelectionSort.setEnabled(true), try using setVisible(false) and setVisible(true).
If that doesn't work, drop the onfocus-part, and do something with a mouse-click event instead.

How to use a text area?

I m creating a GUI in java and would like to use a JTextArea, however I am having a lot of trouble adding it to the frame. How would I go about creating a text Area and then using it to read text or display text?
Here is my GUI code so far:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class addMemoUI extends JFrame {
JFrame frame = new JFrame();
/**
* Create the application.
*/
public addMemoUI() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame.getContentPane().setBackground(new Color(255, 255, 255));
frame.getContentPane().setLayout(null);
JButton button = new JButton("Create");
button.setBackground(new Color(100, 149, 237));
button.setBounds(135, 350, 130, 50);
frame.getContentPane().add(button);
JLabel lblMemos = new JLabel("MEMOS");
lblMemos.setForeground(new Color(100, 149, 237));
lblMemos.setFont(new Font("Moire", Font.BOLD, 30));
lblMemos.setBounds(22, 21, 234, 37);
frame.getContentPane().add(lblMemos);
JButton button_1 = new JButton("Cancel");
button_1.setBackground(new Color(100, 149, 237));
button_1.setBounds(5, 350, 130, 50);
frame.getContentPane().add(button_1);
frame.setBounds(100, 100, 270, 400);
frame.setUndecorated(true); //REMOVES MENU BAR
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton btnExit = new JButton("");
btnExit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
System.exit(0);
}
});
}
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MemoUI window = new MemoUI();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}
Thanks very much :)

Here is example for how to use JTextArea. You can set, get or append text. You can find the others by google.
public class Example {
private JTextArea jtextbox;
private void initialize() {
JFrame frm = new JFrame();
:
JScrollPane scroll = new JScrollPane();
jtextbox= new JTextArea();
scroll.setViewportView(jtextbox); // add scroll panel
jtextbox.setTabSize(4);
jtextbox.setLineWrap(true);
jtextbox.setBackground(SystemColor.window);
}
private void setText(String text) {
jtextbox.append(text); // or setText(text)
}
private String getText() {
return jtextbox.getText();
}
}