Java grid layout GUI - how to enter new pane on event?

Java grid layout GUI - how to enter new pane on event? - java

How can I set a button to link to a completely different grid pane? If I click the JButton "More options" for example, I want it to link me to a new page with more JButton options. Right now, everything is static.
The program right now just calculates the area of a rectangle given an length and width when you press "Calculate." The grid layout is 4 x 2, denoted by JLabel, JTextField, and JButton listed below.
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class RectangleProgram extends JFrame
{
private static final int WIDTH = 400;
private static final int HEIGHT = 300;
private JLabel lengthL, widthL, areaL;
private JTextField lengthTF, widthTF, areaTF;
private JButton calculateB, exitB;
//Button handlers:
private CalculateButtonHandler cbHandler;
private ExitButtonHandler ebHandler;
public RectangleProgram()
{
lengthL = new JLabel("Enter the length: ", SwingConstants.RIGHT);
widthL = new JLabel("Enter the width: ", SwingConstants.RIGHT);
areaL = new JLabel("Area: ", SwingConstants.RIGHT);
lengthTF = new JTextField(10);
widthTF = new JTextField(10);
areaTF = new JTextField(10);
//SPecify handlers for each button and add (register) ActionListeners to each button.
calculateB = new JButton("Calculate");
cbHandler = new CalculateButtonHandler();
calculateB.addActionListener(cbHandler);
exitB = new JButton("Exit");
ebHandler = new ExitButtonHandler();
exitB.addActionListener(ebHandler);
setTitle("Sample Title: Area of a Rectangle");
Container pane = getContentPane();
pane.setLayout(new GridLayout(4, 2));
//Add things to the pane in the order you want them to appear (left to right, top to bottom)
pane.add(lengthL);
pane.add(lengthTF);
pane.add(widthL);
pane.add(widthTF);
pane.add(areaL);
pane.add(areaTF);
pane.add(calculateB);
pane.add(exitB);
setSize(WIDTH, HEIGHT);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
private class CalculateButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
double width, length, area;
length = Double.parseDouble(lengthTF.getText()); //We use the getText & setText methods to manipulate the data entered into those fields.
width = Double.parseDouble(widthTF.getText());
area = length * width;
areaTF.setText("" + area);
}
}
public class ExitButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
}
public static void main(String[] args)
{
RectangleProgram rectObj = new RectangleProgram();
}
}

You can use CardLayout. It allows the two or more components share the same display space.
Here is a simple example
public class RectangleProgram {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame("Area of a Rectangle");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextField lengthField = new JTextField(10);
JTextField widthField = new JTextField(10);
JTextField areaField = new JTextField(10);
JButton calculateButton = new JButton("Calculate");
JButton exitButton = new JButton("Exit");
final JPanel content = new JPanel(new CardLayout());
JButton optionsButton = new JButton("More Options");
optionsButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
CardLayout cardLayout = (CardLayout) content.getLayout();
cardLayout.next(content);
}
});
JPanel panel = new JPanel(new GridLayout(0, 2)) {
#Override
public Dimension getPreferredSize() {
return new Dimension(250, 100);
}
};
panel.add(new JLabel("Enter the length: ", JLabel.RIGHT));
panel.add(lengthField);
panel.add(new JLabel("Enter the width: ", JLabel.RIGHT));
panel.add(widthField);
panel.add(new JLabel("Area: ", JLabel.RIGHT));
panel.add(areaField);
panel.add(calculateButton);
panel.add(exitButton);
JPanel optionsPanel = new JPanel();
optionsPanel.add(new JLabel("Options", JLabel.CENTER));
content.add(panel, "Card1");
content.add(optionsPanel, "Card2");
frame.add(content);
frame.add(optionsButton, BorderLayout.PAGE_END);
frame.pack();
frame.setVisible(true);
}
});
}
}
Read How to Use CardLayout

Related

More than 1 object in a single JFrame

I'm hoping someone can push me in the right direction with this. I have 3 separate classes, Calculator, Calculator2, and a Calculator3. In principal they are all the same, except for a few changes to some of the buttons, so I'll just paste the code for Calculator. I was wondering how can I get them so all appear in a single JFrame next to each other in a main? I attached my most recent attempt of the main as well.
Here is Calculator:
public class Calculator implements ActionListener {
private JFrame frame;
private JTextField xfield, yfield;
private JLabel result;
private JButton subtractButton;
private JButton divideButton;
private JButton addButton;
private JButton timesButton;
private JPanel xpanel;
public Calculator() {
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
xpanel = new JPanel();
xpanel.setLayout(new GridLayout(3,2));
xpanel.add(new JLabel("x:", SwingConstants.RIGHT));
xfield = new JTextField("0", 5);
xpanel.add(xfield);
xpanel.add(new JLabel("y:", SwingConstants.RIGHT));
yfield = new JTextField("0", 5);
xpanel.add(yfield);
xpanel.add(new JLabel("Result:"));
result = new JLabel("0");
xpanel.add(result);
frame.add(xpanel, BorderLayout.NORTH);
/***********************************************************************
***********************************************************************
**********************************************************************/
JPanel southPanel = new JPanel(); //New panel for the artimatic buttons
southPanel.setBorder(BorderFactory.createEtchedBorder());
timesButton = new JButton("Multiplication");
southPanel.add(timesButton);
timesButton.addActionListener(this);
subtractButton = new JButton("Subtract");
southPanel.add(subtractButton);
subtractButton.addActionListener(this);
divideButton = new JButton("Division");
southPanel.add(divideButton);
divideButton.addActionListener(this);
addButton = new JButton("Addition");
southPanel.add(addButton);
addButton.addActionListener(this);
frame.add(southPanel , BorderLayout.SOUTH);
Font thisFont = result.getFont(); //Get current font
result.setFont(thisFont.deriveFont(thisFont.getStyle() ^ Font.BOLD)); //Make the result bold
result.setForeground(Color.red); //Male the result answer red in color
result.setBackground(Color.yellow); //Make result background yellow
result.setOpaque(true);
frame.pack();
frame.setVisible(true);
}
/**
* clear()
* Resets the x and y field to 0 after invalid integers were input
*/
public void clear() {
xfield.setText("0");
yfield.setText("0");
}
#Override
public void actionPerformed(ActionEvent event) {
String xText = xfield.getText(); //Get the JLabel fiels and set them to strings
String yText = yfield.getText();
int xVal;
int yVal;
try {
xVal = Integer.parseInt(xText); //Set global var xVal to incoming string
yVal = Integer.parseInt(yText); //Set global var yVal to incoming string
}
catch (NumberFormatException e) { //xVal or yVal werent valid integers, print message and don't continue
result.setText("ERROR");
clear();
return ;
}
if(event.getSource().equals(timesButton)) { //Button pressed was multiply
result.setText(Integer.toString(xVal*yVal));
}
else if(event.getSource().equals(divideButton)) { //Button pressed was division
if(yVal == 0) { //Is the yVal (bottom number) 0?
result.setForeground(Color.red); //Yes it is, print message
result.setText("CAN'T DIVIDE BY ZERO!");
clear();
}
else
result.setText(Integer.toString(xVal/yVal)); //No it's not, do the math
}
else if(event.getSource().equals(subtractButton)) { //Button pressed was subtraction
result.setText(Integer.toString(xVal-yVal));
}
else if(event.getSource().equals(addButton)) { //Button pressed was addition
result.setText(Integer.toString(xVal+yVal));
}
}
}
And here is my current main:
public class DemoCalculator {
public static void main(String[] args) {
JFrame mainFrame = new JFrame("Calculators");
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Calculator calc = new Calculator();
Calculator2 calc2 = new Calculator2();
JPanel calcPanel = new JPanel(new BorderLayout());
JPanel calcPanel2 = new JPanel(new BorderLayout());
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
//calcPanel.add(calc, BorderLayout.CENTER);
//calcPanel2.add(calc2, BorderLayout.CENTER);
mainPanel.add(calcPanel);
mainPanel.add(calcPanel2);
calcPanel.add(mainPanel);
mainFrame.getContentPane().add(calcPanel);
mainFrame.getContentPane().add(calcPanel2);
mainFrame.pack();
mainFrame.setVisible(true);
}
}

You should just create a single JFrame and put your Calculator classes each into a single JPanel.Don't create a new JFrame for each class.
public class Calculator{
JPanel panel;
public Calculator(){
panel = new JPanel();
/*
* Add labels and buttons etc.
*/
panel.add(buttons);
panel.add(labels);
}
//Method to return the JPanel
public JPanel getPanel(){
return panel;
}
}
Then add the panels to your JFrame in your testers class using whatever layout best suits your needs.
public class DemoCalculator {
public static void main(String[] args) {
JPanel cal1,cal2;
JFrame frame = new JFrame("Calculators");
frame.add(cal1 = new Calculator().getPanel(),new BorderLayout().EAST);
frame.add(cal2 = new Calculator2().getPanel(),new BorderLayout().WEST);
frame.setSize(1000,600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setResizable(false);
frame.setVisible(true);
}
}

Fails to display label and text field in Swing

I just started learning Swing with a simple code to create login form.
package swingbeginner;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class LoginForm {
private JFrame mainFrame;
private JLabel headerLabel;
private JLabel inputLabel;
private JPanel inputPanel;
private JPanel controlPanel;
private JLabel statusLabel;
public LoginForm() {
prepareGUI();
}
public static void main(String[] args) {
LoginForm loginForm = new LoginForm();
loginForm.loginProcess();
}
private void prepareGUI() {
mainFrame = new JFrame("Login");
mainFrame.setSize(600, 600);
mainFrame.setLayout(new FlowLayout());
headerLabel = new JLabel("",JLabel.CENTER );
statusLabel = new JLabel("",JLabel.CENTER);
statusLabel.setSize(350,100);
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent) {
}
});
inputLabel = new JLabel();
inputLabel.setLayout(null);
inputPanel = new JPanel();
inputPanel.setLayout(null);
controlPanel = new JPanel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(inputLabel);
mainFrame.add(inputPanel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void loginProcess() {
headerLabel.setText("Please Login to Continue!");
JLabel usernameLabel = new JLabel("Username");
usernameLabel.setBounds(10,20,80,25);
JLabel passwordLabel = new JLabel("Password");
passwordLabel.setBounds(10, 20, 80, 25);
JTextField usernameTextbox = new JTextField();
usernameTextbox.setBounds(100,20,165,25);
JPasswordField passwordTextbox = new JPasswordField();
passwordTextbox.setBounds(100,20,165,25);
JButton loginButton = new JButton("Login");
JButton cancelButton = new JButton("Cancel");
loginButton.setActionCommand("Login");
cancelButton.setActionCommand("Cancel");
loginButton.addActionListener(new ButtonClickListener());
cancelButton.addActionListener(new ButtonClickListener());
inputLabel.add(usernameLabel);
inputPanel.add(usernameTextbox);
inputLabel.add(passwordLabel);
inputPanel.add(passwordTextbox);
controlPanel.add(loginButton);
controlPanel.add(cancelButton);
mainFrame.setVisible(true);
}
private class ButtonClickListener implements ActionListener {
public void actionPerformed(ActionEvent actionEvent) {
String command = actionEvent.getActionCommand();
if(command.equals("Login")) {
statusLabel.setText("Logging In");
}
else if(command.equals("Cancel")) {
statusLabel.setText("Login Cancelled");
}
}
}
}
My code displays header along with Login and Cancel button. But the Labels/Text field (Username and Password) are not been displayed in the panel.
Where am I going wrong?

since everyone is missing the fact of the null layout ill create an answer myself.
inputPanel.setLayout(null);
if you add components to this, you will have to specify the position or you simply use a layoutmanager like BorderLayout or FlowLayout.
inputPanel.setLayout(new FlowLayout());
if you use this you will be able to simply add the components to the JPanel. Also as stated in the other answers, don't add JLabels to other JLables, because the most top one will override the others. With that being said a solution code which should work would looks like this:
public class LoginForm {
private JFrame mainFrame;
private JLabel headerLabel;
private JPanel inputPanel;
private JPanel controlPanel;
private JLabel statusLabel;
public LoginForm() {
prepareGUI();
}
public static void main(String[] args) {
LoginForm loginForm = new LoginForm();
loginForm.loginProcess();
}
private void prepareGUI() {
mainFrame = new JFrame("Login");
mainFrame.setSize(600, 600);
mainFrame.setLayout(new FlowLayout());
headerLabel = new JLabel("",JLabel.CENTER );
statusLabel = new JLabel("",JLabel.CENTER);
statusLabel.setSize(350,100);
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent) {
}
});
//changes here
inputPanel = new JPanel();
inputPanel.setLayout(new FlowLayout());
controlPanel = new JPanel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(inputLabel);
mainFrame.add(inputPanel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void loginProcess() {
headerLabel.setText("Please Login to Continue!");
JLabel usernameLabel = new JLabel("Username");
usernameLabel.setBounds(10,20,80,25);
JLabel passwordLabel = new JLabel("Password");
passwordLabel.setBounds(10, 20, 80, 25);
JTextField usernameTextbox = new JTextField();
usernameTextbox.setBounds(100,20,165,25);
JPasswordField passwordTextbox = new JPasswordField();
passwordTextbox.setBounds(100,20,165,25);
JButton loginButton = new JButton("Login");
JButton cancelButton = new JButton("Cancel");
loginButton.setActionCommand("Login");
cancelButton.setActionCommand("Cancel");
loginButton.addActionListener(new ButtonClickListener());
cancelButton.addActionListener(new ButtonClickListener());
inputPanel.add(usernameLabel); //changes here
inputPanel.add(usernameTextbox);
inputPanel.add(passwordLabel); //changes here
inputPanel.add(passwordTextbox);
controlPanel.add(loginButton);
controlPanel.add(cancelButton);
mainFrame.setVisible(true);
}
private class ButtonClickListener implements ActionListener {
public void actionPerformed(ActionEvent actionEvent) {
String command = actionEvent.getActionCommand();
if(command.equals("Login")) {
statusLabel.setText("Logging In");
}
else if(command.equals("Cancel")) {
statusLabel.setText("Login Cancelled");
}
}
}
}

Here is your solution:
package swingbeginner;
public class LoginForm {
private JFrame mainFrame;
private JLabel headerLabel;
private JLabel inputLabel;
private JPanel inputPanel;
private JPanel controlPanel;
private JLabel statusLabel;
public LoginForm() {
prepareGUI();
}
public static void main(String[] args) {
LoginForm loginForm = new LoginForm();
loginForm.loginProcess();
}
private void prepareGUI() {
mainFrame = new JFrame("Login");
mainFrame.setSize(600, 600);
mainFrame.setLayout(new BorderLayout());
headerLabel = new JLabel("header", JLabel.CENTER);
statusLabel = new JLabel("status", JLabel.CENTER);
statusLabel.setSize(350, 100);
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent) {
}
});
controlPanel = new JPanel();
controlPanel.setLayout(new FlowLayout(FlowLayout.CENTER, 100, 100));
mainFrame.add(headerLabel, BorderLayout.NORTH);
mainFrame.add(controlPanel, BorderLayout.CENTER);
mainFrame.add(statusLabel, BorderLayout.SOUTH);
mainFrame.setVisible(true);
}
private void loginProcess() {
headerLabel.setText("Please Login to Continue!");
JLabel usernameLabel = new JLabel("Username");
usernameLabel.setBounds(10, 20, 80, 25);
JLabel passwordLabel = new JLabel("Password");
passwordLabel.setBounds(10, 20, 80, 25);
JTextField usernameTextbox = new JTextField(20);
usernameTextbox.setBounds(100, 20, 165, 25);
JPasswordField passwordTextbox = new JPasswordField(20);
passwordTextbox.setBounds(100, 20, 165, 25);
JButton loginButton = new JButton("Login");
JButton cancelButton = new JButton("Cancel");
loginButton.setActionCommand("Login");
cancelButton.setActionCommand("Cancel");
loginButton.addActionListener(new ButtonClickListener());
cancelButton.addActionListener(new ButtonClickListener());
controlPanel.add(usernameLabel);
controlPanel.add(usernameTextbox);
controlPanel.add(passwordLabel);
controlPanel.add(passwordTextbox);
controlPanel.add(loginButton);
controlPanel.add(cancelButton);
mainFrame.setVisible(true);
}
private class ButtonClickListener implements ActionListener {
public void actionPerformed(ActionEvent actionEvent) {
String command = actionEvent.getActionCommand();
if (command.equals("Login")) {
statusLabel.setText("Logging In");
}
else if (command.equals("Cancel")) {
statusLabel.setText("Login Cancelled");
}
}
}
}

You are adding usernameLabel and passwordLabel onto another label inputLabel. [When stacking labels, the topmost label will overwrite and those labels will disappear.] (JLabel on top of another JLabel)! Why don't you add all the labels and fields directly to the mainFrame i.e. the JFrame object?

You are adding Labels/Textfield(Username and Password) to inputLabel which is an instance of JLabel which is not of type of a container.
Change
inputLabel.add(usernameLabel);
inputPanel.add(usernameTextbox);
inputLabel.add(passwordLabel);
inputPanel.add(passwordTextbox);
to
controlPanel.add(usernameLabel);
controlPanel.add(usernameTextbox);
controlPanel.add(passwordLabel);
controlPanel.add(passwordTextbox);
Also give JTextField a default size, so change
JTextField usernameTextbox = new JTextField();
JPasswordField passwordTextbox = new JPasswordField();
to
JTextField usernameTextbox = new JTextField(20);
JPasswordField passwordTextbox = new JPasswordField(20);
Or you can change the type of inputLabel variable to JPanel and set it a layout like FlowLayout.
In this case no need to use setBounds method on components.
Note: that you use the same bounds for multiple components which will make them one on top of another.

How to position JButton in a JFrame window?

My program is about a supermarket. I want to position the JButton 'b1' just below JLabel 'l1' and also below JTextField 'jt1'. I want the JButton 'b1' to also be in the centre but below 'l1' and 'jt1'. Below is the delivery() method of my program:
public static void delivery()
{
final JFrame f1 = new JFrame("Name");
f1.setVisible(true);
f1.setSize(600,200);
f1.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f1.setLocation(700,450);
JPanel p1 = new JPanel();
final JLabel l1 = new JLabel("Enter your name: ");
final JTextField jt1 = new JTextField(20);
JButton b1 = new JButton("Ok");
b1.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
input1 = jt1.getText();
f1.setVisible(false);
}
});
p1.add(b1);
p1.add(l1);
p1.add(jt1);
f1.add(p1);
final JFrame f2 = new JFrame("Address");
f2.setVisible(true);
f2.setSize(600,200);
f2.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f2.setLocation(700,450);
JPanel p2 = new JPanel();
final JLabel l2 = new JLabel("Enter your address: ");
final JTextField jt2 = new JTextField(20);
JButton b2 = new JButton("Ok");
b2.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
input2 = jt2.getText();
f2.setVisible(false);
}
});
p2.add(b2);
p2.add(l2);
p2.add(jt2);
f2.add(p2);
}
}

You can use multiple JPanels to get close to what you want:
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class MyGui {
public static void delivery()
{
JFrame f1 = new JFrame("Name");
f1.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f1.setBounds(200, 100, 500, 300);
Container cpane = f1.getContentPane();
JPanel p1 = new JPanel();
p1.setLayout(new BoxLayout(p1, BoxLayout.LINE_AXIS)); //Horizontal
JLabel l1 = new JLabel("Enter your name: ");
JTextField jt1 = new JTextField(20);
jt1.setMaximumSize( jt1.getPreferredSize() );
p1.add(l1);
p1.add(jt1);
JPanel p2 = new JPanel();
p2.setLayout(new BoxLayout(p2, BoxLayout.PAGE_AXIS)); //Vertical
p2.add(p1);
JButton b1 = new JButton("Ok");
p2.add(b1);
cpane.add(p2);
f1.setVisible(true);
}
}
public class SwingProg {
private static void createAndShowGUI() {
MyGui.delivery();
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}

Use the GridBagLayout Class. It's for custom designing using Constraints.

Can't seem to get .remove to work

So for a class that I am currently taking I need to create an ATM System. So, I decided to have 2 panels. A main panel, where all of the processes take place, and an options panel, where the options are listed for the user. The problem, as mentioned above, is that I can't seem to get the main panel to be removed so I can actually replace it with the panel for, say the create account screen. In fact, all that happens is that the terminal window shows. Completely blank. As far as I have checked, the buttons event is firing and it even gets past the remove function.
In any event, I can't seem to figure out what the problem is, perhaps it is because the button being pressed is also being removed with the panel. Here's the related code.
public class AccountSystem extends JFrame implements ActionListener
{
public static Account currentuser = new Account(); //This is so that the methods know which account is currently logged in so they can perform operations on it.
public static int count=0;
public static Account acc[] = new Account[1000];
public static String parts[] = new String[3];
private JButton login, logout, createacc, deposit1, deposit2, withdraw1, withdraw2, transfer1, transfer2, nevermind;
private JPanel options, mainarea, titlecard;
private JTextField username, password, transfer, depositarea, withdrawarea, retypearea;
private JLabel userprompt, depositprompt, withdrawpromt, balancedisp, passwordprompt, mainmessage, title;
private String newuser, newpass, newpassconfirm;
BorderLayout borderlayout;
GridLayout gridlayout;
public AccountSystem()
{
borderlayout = new BorderLayout();
borderlayout.setHgap(5);
borderlayout.setVgap(5);
//Establishing our buttons here.
JButton login = new JButton("Login");
login.addActionListener(this);
JButton createacc = new JButton("New Account");
createacc.addActionListener(this);
//Establishing our panels here.
JPanel options = new JPanel();
JPanel mainarea = new JPanel();
JPanel titlecard = new JPanel();
//Establishing our JLabel here.
JLabel userprompt = new JLabel("Username: ");
JLabel passwordprompt = new JLabel("Password: ");
JLabel title = new JLabel(" LOGIN ");
//Establishing our textfields here.
JTextField username = new JTextField(20);
JTextField password = new JTextField(20);
JTextField transfer = new JTextField(20);
JTextField withdrawarea = new JTextField(20);
//Building the GUI here.
titlecard.setSize(500,50);
titlecard.setLocation (0,0);
mainarea.setSize(300,450);
mainarea.setLocation(0,50);
options.setSize(150,450);
options.setLocation(300,50);
titlecard.add(title);
mainarea.add(userprompt);
mainarea.add(username);
mainarea.add(passwordprompt);
mainarea.add(password);
mainarea.add(login);
mainarea.add(createacc);
getContentPane().setLayout(null);
getContentPane().add(titlecard);
getContentPane().add(mainarea);
getContentPane().add(options);
}
}
public void actionPerformed (ActionEvent e)
{
if ((e.getActionCommand()).equals("Login"))
{
login();
}
else if ((e.getActionCommand()).equals("New Account"))
{
accountmaker();
}
else if ((e.getActionCommand()).equals("Deposit Funds"))
{
deposit();
}
else if ((e.getActionCommand()).equals("Withdraw Funds"))
{
withdraw();
}
else if ((e.getActionCommand()).equals("Withdraw"))
{
withdrawprocedure();
}
else if ((e.getActionCommand()).equals("Create Account"))
{
accountprocedure();
}
}
public void accountmaker() //This is the screen where the user creates the account they want to. Of course, something needed to be done to differentiate this screen and the login screen.
{
currentuser = null; //This is so that the program doesn't get somehow confused when dealing with multiple uses of the program.
getContentPane().remove(mainarea);
title.setText("Create New Account");
mainarea = new JPanel();
JLabel userprompt = new JLabel ("Username: ");
JLabel passwordprompt = new JLabel("Password: ");
JLabel retype = new JLabel ("Retype: "); //This is what makes it different from the login screen
createacc = new JButton ("Create Account");
createacc.addActionListener(this);
JButton nevermind = new JButton("Cancel");
nevermind.addActionListener(this);
JTextField username = new JTextField(20);
JTextField password = new JTextField(20);
retypearea = new JTextField(20);
mainarea.setSize(300,500);
mainarea.setLocation(0,0);
mainarea.add(userprompt);
mainarea.add(username);
mainarea.add(passwordprompt);
mainarea.add(password);
mainarea.add(retype);
mainarea.add(retypearea);
getContentPane().add(mainarea);
getContentPane().invalidate();
getContentPane().validate();
getContentPane().repaint();
}
And this is the Account class that the program uses.
public class Account
{
private String username;
private String password;
private double balance=0;
public void deposit (double deposit)
{
balance += deposit;
}
public void withdraw (double withdraw)
{
balance -= withdraw;
}
public void setBalance (double newbalance)
{
balance = newbalance;
}
public void setUsername (String newusername)
{
username = newusername;
}
public void setPassword (String newpassword)
{
password = newpassword;
}
public String getUsername ()
{
return username;
}
public double getbalance ()
{
return balance;
}
public String getpassword()
{
return password;
}
}

If I understand correctly.. you basically need to replace the main panel with account panel on certain event!
I have written example code (please modify it according to your project)
In this code.. I have created 4 panels namely
Component Panel: To hold all components
Main Panel: contains the label with text "Main Panel" and its border is painted RED
Account Panel: contains the label with text "Account Panel" and its border is painted GREEN
Option Panel: empty panel with its border is painted BLUE
Two buttons:
Account Button: Which should replace Main Panel with Account Panel
Main Button: Which should replace Account Panel with Main Panel
Using GridBagLayout, all you need to do is to place Main Panel and Account Panel at the same location i.e. gridx = 0 and gridy = 0 for both. At first Main Panel shall be displayed. On event "Account Button" set Main Panel's visibility false and Account Panels' true. For event "Main Button" do the vica versa. GridBagLayout is fantastic dynamic layout which manages the empty spacing by itslef without any distortion.
public class SwingSolution extends JFrame implements ActionListener
{
private JPanel componentPanel = null;
private JPanel mainPanel = null;
private JLabel mainLabel = null;
private JPanel optionPanel = null;
private JPanel accountPanel = null;
private JLabel accountLabel = null;
private JButton replaceToAccountPanel = null;
private JButton replaceToMainPanel = null;
private final static String MAIN_TO_ACCOUNT = "MainToAccount";
private final static String ACCOUNT_TO_MAIN = "AccountToMain";
public JPanel getComponentPanel()
{
if(null == componentPanel)
{
componentPanel = new JPanel();
GridBagLayout gridBagLayout = new GridBagLayout();
componentPanel.setLayout(gridBagLayout);
GridBagConstraints constraint = new GridBagConstraints();
constraint.insets = new Insets(10, 10, 10, 10);
mainPanel = new JPanel();
constraint.gridx = 0;
constraint.gridy = 0;
mainPanel.setMinimumSize(new Dimension(100, 50));
mainPanel.setPreferredSize(new Dimension(100, 50));
mainPanel.setMaximumSize(new Dimension(100, 50));
mainPanel.setBorder(
BorderFactory.createLineBorder(Color.RED));
mainLabel = new JLabel("Main Panel");
mainPanel.add(mainLabel);
componentPanel.add(mainPanel, constraint);
accountPanel = new JPanel();
constraint.gridx = 0;
constraint.gridy = 0;
accountPanel.setMinimumSize(new Dimension(100, 50));
accountPanel.setPreferredSize(new Dimension(100, 50));
accountPanel.setMaximumSize(new Dimension(100, 50));
accountPanel.setBorder(
BorderFactory.createLineBorder(Color.GREEN));
accountLabel = new JLabel("Account Panel");
accountPanel.add(accountLabel);
componentPanel.add(accountPanel, constraint);
optionPanel = new JPanel();
constraint.gridx = 0;
constraint.gridy = 1;
optionPanel.setMinimumSize(new Dimension(100, 50));
optionPanel.setPreferredSize(new Dimension(100, 50));
optionPanel.setMaximumSize(new Dimension(100, 50));
optionPanel.setBorder(
BorderFactory.createLineBorder(Color.BLUE));
componentPanel.add(optionPanel, constraint);
replaceToAccountPanel = new JButton("Account Button");
replaceToAccountPanel.setName(MAIN_TO_ACCOUNT);
constraint.gridx = 0;
constraint.gridy = 2;
replaceToAccountPanel.setSize(new Dimension(800, 30));
replaceToAccountPanel.addActionListener(this);
componentPanel.add(replaceToAccountPanel, constraint);
replaceToMainPanel = new JButton("Main Button");
replaceToMainPanel.setName(ACCOUNT_TO_MAIN);
constraint.gridx = 1;
constraint.gridy = 2;
replaceToMainPanel.setMinimumSize(new Dimension(800, 30));
replaceToMainPanel.addActionListener(this);
componentPanel.add(replaceToMainPanel, constraint);
}
return componentPanel;
}
public void actionPerformed (ActionEvent evt)
{
JButton buttonClicked = (JButton) evt.getSource();
if(buttonClicked != null)
{
if(buttonClicked.getName().equals(MAIN_TO_ACCOUNT))
{
mainPanel.setVisible(false);
accountPanel.setVisible(true);
}
else if(buttonClicked.getName().equals(ACCOUNT_TO_MAIN))
{
mainPanel.setVisible(true);
accountPanel.setVisible(false);
}
}
}
public static void main(String[] args)
{
JFrame frame = new JFrame();
SwingSolution main = new SwingSolution();
frame.setTitle("Simple example");
frame.setSize(400, 300);
frame.setLocationRelativeTo(null);
frame.setContentPane(main.getComponentPanel());
frame.setVisible(true);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
}

CardLayout issue

I have a card layout, first card is a menu.
I Select the second card, and carry out some action. We'll say add a JTextField by clicking a button. If I return to the menu card, and then go back to the second card, that JTextField I added the first time will still be there.
I want the second card to be as I originally constructed it each time I access it, with the buttons, but without the Textfield.

Make sure the panel you're trying to reset has code that takes it back to its "as it was originally constructed" state. Then, when you process the whatever event that causes you to change cards, call that code to restore the original state before showing the card.

Here is the final sorted out version, to remove the card, after doing changes to it, have a look, use the revalidate() and repaint() thingy as usual :-)
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ApplicationBase extends JFrame
{
private JPanel centerPanel;
private int topPanelCount = 0;
private String[] cardNames = {
"Login Window",
"TextField Creation"
};
private TextFieldCreation tfc;
private LoginWindow lw;
private JButton nextButton;
private JButton removeButton;
private ActionListener actionListener = new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
if (ae.getSource() == nextButton)
{
CardLayout cardLayout = (CardLayout) centerPanel.getLayout();
cardLayout.next(centerPanel);
}
else if (ae.getSource() == removeButton)
{
centerPanel.remove(tfc);
centerPanel.revalidate();
centerPanel.repaint();
tfc = new TextFieldCreation();
tfc.createAndDisplayGUI();
centerPanel.add(tfc, cardNames[1]);
}
}
};
private void createAndDisplayGUI()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationByPlatform(true);
centerPanel = new JPanel();
centerPanel.setLayout(new CardLayout());
lw = new LoginWindow();
lw.createAndDisplayGUI();
centerPanel.add(lw, cardNames[0]);
tfc = new TextFieldCreation();
tfc.createAndDisplayGUI();
centerPanel.add(tfc, cardNames[1]);
JPanel bottomPanel = new JPanel();
removeButton = new JButton("REMOVE");
nextButton = new JButton("NEXT");
removeButton.addActionListener(actionListener);
nextButton.addActionListener(actionListener);
bottomPanel.add(removeButton);
bottomPanel.add(nextButton);
add(centerPanel, BorderLayout.CENTER);
add(bottomPanel, BorderLayout.PAGE_END);
pack();
setVisible(true);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new ApplicationBase().createAndDisplayGUI();
}
});
}
}
class TextFieldCreation extends JPanel
{
private JButton createButton;
private int count = 0;
public void createAndDisplayGUI()
{
final JPanel topPanel = new JPanel();
topPanel.setLayout(new GridLayout(0, 2));
createButton = new JButton("CREATE TEXTFIELD");
createButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
JTextField tfield = new JTextField();
tfield.setActionCommand("JTextField" + count);
topPanel.add(tfield);
topPanel.revalidate();
topPanel.repaint();
}
});
setLayout(new BorderLayout(5, 5));
add(topPanel, BorderLayout.CENTER);
add(createButton, BorderLayout.PAGE_END);
}
}
class LoginWindow extends JPanel
{
private JPanel topPanel;
private JPanel middlePanel;
private JPanel bottomPanel;
public void createAndDisplayGUI()
{
topPanel = new JPanel();
JLabel userLabel = new JLabel("USERNAME : ", JLabel.CENTER);
JTextField userField = new JTextField(20);
topPanel.add(userLabel);
topPanel.add(userField);
middlePanel = new JPanel();
JLabel passLabel = new JLabel("PASSWORD : ", JLabel.CENTER);
JTextField passField = new JTextField(20);
middlePanel.add(passLabel);
middlePanel.add(passField);
bottomPanel = new JPanel();
JButton loginButton = new JButton("LGOIN");
bottomPanel.add(loginButton);
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
add(topPanel);
add(middlePanel);
add(bottomPanel);
}
}
If you just wanted to remove the Latest Edit made to the card, try this code :
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ApplicationBase extends JFrame
{
private JPanel centerPanel;
private int topPanelCount = 0;
private String[] cardNames = {
"Login Window",
"TextField Creation"
};
private TextFieldCreation tfc;
private LoginWindow lw;
private JButton nextButton;
private JButton removeButton;
private ActionListener actionListener = new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
if (ae.getSource() == nextButton)
{
CardLayout cardLayout = (CardLayout) centerPanel.getLayout();
cardLayout.next(centerPanel);
}
else if (ae.getSource() == removeButton)
{
TextFieldCreation.topPanel.remove(TextFieldCreation.tfield);
TextFieldCreation.topPanel.revalidate();
TextFieldCreation.topPanel.repaint();
}
}
};
private void createAndDisplayGUI()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationByPlatform(true);
centerPanel = new JPanel();
centerPanel.setLayout(new CardLayout());
lw = new LoginWindow();
lw.createAndDisplayGUI();
centerPanel.add(lw, cardNames[0]);
tfc = new TextFieldCreation();
tfc.createAndDisplayGUI();
centerPanel.add(tfc, cardNames[1]);
JPanel bottomPanel = new JPanel();
removeButton = new JButton("REMOVE");
nextButton = new JButton("NEXT");
removeButton.addActionListener(actionListener);
nextButton.addActionListener(actionListener);
bottomPanel.add(removeButton);
bottomPanel.add(nextButton);
add(centerPanel, BorderLayout.CENTER);
add(bottomPanel, BorderLayout.PAGE_END);
pack();
setVisible(true);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new ApplicationBase().createAndDisplayGUI();
}
});
}
}
class TextFieldCreation extends JPanel
{
private JButton createButton;
private int count = 0;
public static JTextField tfield;
public static JPanel topPanel;
public void createAndDisplayGUI()
{
topPanel = new JPanel();
topPanel.setLayout(new GridLayout(0, 2));
createButton = new JButton("CREATE TEXTFIELD");
createButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
tfield = new JTextField();
tfield.setActionCommand("JTextField" + count);
topPanel.add(tfield);
topPanel.revalidate();
topPanel.repaint();
}
});
setLayout(new BorderLayout(5, 5));
add(topPanel, BorderLayout.CENTER);
add(createButton, BorderLayout.PAGE_END);
}
}
class LoginWindow extends JPanel
{
private JPanel topPanel;
private JPanel middlePanel;
private JPanel bottomPanel;
public void createAndDisplayGUI()
{
topPanel = new JPanel();
JLabel userLabel = new JLabel("USERNAME : ", JLabel.CENTER);
JTextField userField = new JTextField(20);
topPanel.add(userLabel);
topPanel.add(userField);
middlePanel = new JPanel();
JLabel passLabel = new JLabel("PASSWORD : ", JLabel.CENTER);
JTextField passField = new JTextField(20);
middlePanel.add(passLabel);
middlePanel.add(passField);
bottomPanel = new JPanel();
JButton loginButton = new JButton("LGOIN");
bottomPanel.add(loginButton);
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
add(topPanel);
add(middlePanel);
add(bottomPanel);
}
}

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