I've been looking around, including in the Java documentation, but there isn't a clear answer that I've found for my question : I would like to switch from one JFrame to another at the click of a button; that is, have the old JFrame close while the new one opens. I've heard of "CardLayout" but I'm not so sure how it works. Would anyone mind explaining it, or some other method?
Thanks
Here is an example of a CardLayout
As you've heard other say, don't use multiple JFrames.
import javax.swing.*;
import java.awt.*;
public class MainFrame
{
static JPanel homeContainer;
static JPanel homePanel;
static JPanel otherPanel;
static CardLayout cl;
public MainFrame()
{
JFrame mFrame = new JFrame("CardLayout Example");
JButton showOtherPanelBtn = new JButton("Show Other Panel");
JButton backToHomeBtn = new JButton("Show Home Panel");
cl = new CardLayout(5, 5);
homeContainer = new JPanel(cl);
homeContainer.setBackground(Color.black);
homePanel = new JPanel();
homePanel.setBackground(Color.blue);
homePanel.add(showOtherPanelBtn);
homeContainer.add(homePanel, "Home");
otherPanel = new JPanel();
otherPanel.setBackground(Color.green);
otherPanel.add(backToHomeBtn);
homeContainer.add(otherPanel, "Other Panel");
showOtherPanelBtn.addActionListener(e -> cl.show(homeContainer, "Other Panel"));
backToHomeBtn.addActionListener(e -> cl.show(homeContainer, "Home"));
mFrame.add(homeContainer);
cl.show(homeContainer, "Home");
mFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
mFrame.setLocationRelativeTo(null);
mFrame.setExtendedState(JFrame.MAXIMIZED_BOTH);
mFrame.pack();
mFrame.setVisible(true);
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(MainFrame::new);
}
}
You don't need to use a CardLayout for anything in this case. In fact, JFrame's don't have layouts.
Here's some code to illustrate that idea (assuming you're using Java 8; otherwise, add the final modifier to oldFrame and newFrame:
JFrame parent = new JFrame();
JDialog oldFrame = new JDialog("My Old Frame's Title");
JDialog newFrame = new JDialog("My New Frame's Title");
JPanel panel = new JPanel();
JButton myButton = new JButton();
myButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
oldFrame.dispose(); //closes your old frame
newFrame.setVisible(true); //opens your new frame
}
});
panel.add(myButton);
oldFrame.add(panek);
oldFrame.setVisible(true);
Whenever you click your button, the old frame closes, and the new one opens.
Related
I'm trying to learn Java Swing. Right now, I'm making a simple program and I need to make a button. I have two classes: driver and swing.
I create the button and import the javax.swing.JButton and added the button. Finally, the button added to the panel but Idk why I just get the panel?
Can anyone help me, please? Here's my code:
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Swing extends JFrame {
private JFrame f;
private JButton button;
private JLabel label;
private JPanel panel;
public Swing() {
}
public Swing(String titleName) {
creatButton();
creatFrame(titleName);
}
public void creatButton() {
JButton btn = new JButton("click me");
JPanel panel = new JPanel();
panel.add(btn);
btn.setBounds(50, 100, 95, 30);
add(panel);
}
private void creatFrame(String title) {
JFrame f = new JFrame(title);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
f.setSize(400, 500);
f.setLayout(null);
}
}
public class Driver {
public static void main (String [] args) {
new Swing ("calculator");
}
}
Okay,lets start with...
JButton btn = new JButton("click me");
JPanel panel = new JPanel();
panel.add(btn);
btn.setBounds(50, 100, 95, 30);
add(panel);
You:
Create a button
Create a panel
You add the button to panel
You add the panel to the frame
And then...
JFrame f = new JFrame("calculator");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new
f.setVisible(true);
You create a brand new instance of JFrame and show it, but it has nothing on to it?! 😱!
Instead, you should avoid extending from JFrame and maybe use JPanel instead, something like...
public class Swing extends JPanel {
private JButton button;
private JLabel label;
public Swing() {
creatButton();
add(button);
}
public void creatButton() {
JButton btn = new JButton("click me");
}
}
Then you can just create a window (or other container) and add it to it
JFrame f = new JFrame(title);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new Swing());
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
As a general rule, JFrame is a really poor extension point, it's a complex, compound component and locks you into a single use case. It's generally a better idea to start with something JPanel which provides you with a lot more flexibility and a lot less complexity and is easily reusable.
You really, really, really need to avoid null layouts
creatFrame is creating a new JFrame different than the frame itself (your Swing class extending JFrame).
Remove the line:
JFrame f = new JFrame(title);
and call the methods over this instead of f.
I was wondering if it was possible to add dropdown menus to a main JPanel from a different class instead of calling it from that class itself. Mainly because a friend and I are working on a personal project trying to create different programs in different tabs.
Here's our main GUI:
public class GUI extends JFrame {
public GUI() {
setTitle("Andy and Jack's favorite programs");
JTabbedPane jtp = new JTabbedPane();
getContentPane().add(jtp);
JPanel jp1 = new JPanel();
JLabel label1 = new JLabel();
JPanel jp2 = new JPanel();
JLabel label2 = new JLabel();
jp1.add(label1);
jtp.addTab("Andy - Encryption Program");
jp2.add(label2);
jtp.addTab("Andy - Hello World Program");
}
public static void main(String[] args) {
GUI tp = new GUI();
tp.setVisible(true);
tp.setMinimumSize(new Dimension(400, 400));
}
Here's one of our tabs:
public class encryptionPrograms extends GUI {
String[] options = new String[] { "XOR", "RSA" };
ComboBox optionsList = new JComboBox(options);
jp1.add(optionsList, BorderLayout.CENTER);
}
I'm not sure if I'm doing it correctly or not. Just got into Java and we've have been playing around with the GUI buttons and such.
There is a lot of "wrong" here and without you saying what your intention is with adding a comboBox to your jPanel it's hard to tell you the right way to do it but yes it can be done.
But first of: Always declare your variables before you initialize them so that you can access them for other methods in the class:
public class GUI extends JFrame{
private JPanel jp1,jp2;
private JLabel label1,label2;
private JTabbedPane jtp;
public GUI() {
setTitle("Andy and Jack's favorite programs");
jtp = new JTabbedPane();
jp1 = new JPanel();
label1 = new JLabel();
jp2 = new JPanel();
label2 = new JLabel();
jp1.add(label1);
jtp.addTab("Andy - Encryption Program", jp1);
jp2.add(label2);
jtp.addTab("Andy - Hello World Program",jp2);
getContentPane().add(jtp);
}
If you need to access a variable from another class you can write a get method for it.
For example:
public JPanel getMainJPanel(){
return jp1;
}
Now you can call the getMainJPanel() from another class in order to, for instance, add components to it. Just remember to .revalidate() and .repaint() the main frame after adding more components.
I've created two jframes main_frame and sub_frame where main_frame holds a jbutton. Now i want that button to open sub_frame in the same frame(main_frame) and set main_frame disable until sub_frame is opened.
Note that I dont want main_frame to setVisible(false).
I suggest you use a CardLayout
Instead of multiple JFrames, you have multiple JPanels and switch between them.
Here is an example:
package main.frames;
import javax.swing.*;
import java.awt.*;
public class MainFrame extends JFrame
{
static JPanel homeContainer;
static JPanel homePanel;
static JPanel otherPanel;
static CardLayout cl;
public MainFrame()
{
JButton showOtherPanelBtn = new JButton("Show Other Panel");
JButton backToHomeBtn = new JButton("Show Home Panel");
cl = new CardLayout(5, 5);
homeContainer = new JPanel(cl);
homeContainer.setBackground(Color.black);
homePanel = new JPanel();
homePanel.setBackground(Color.blue);
homePanel.add(showOtherPanelBtn);
homeContainer.add(homePanel, "Home");
otherPanel = new JPanel();
otherPanel.setBackground(Color.green);
otherPanel.add(backToHomeBtn);
homeContainer.add(otherPanel, "Other Panel");
showOtherPanelBtn.addActionListener(e -> cl.show(homeContainer, "Other Panel"));
backToHomeBtn.addActionListener(e -> cl.show(homeContainer, "Home"));
add(homeContainer);
cl.show(homeContainer, "Home");
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setLocationRelativeTo(null);
setExtendedState(JFrame.MAXIMIZED_BOTH);
setTitle("CardLayout Example");
pack();
setVisible(true);
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(MainFrame::new);
}
}
It is really easy, just call the constructor and set visibility:
SubFrameClass frame = new SubFrameClass();
frame.setVisible(true);
Please help me out to separate these ActionListeners in a periodic table that I am attempting to complete. When I execute the program and click on 'H', it opens all the other elements and when the others are clicked, it does not work. So I need a way to separate these using any method...
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class PeriodicTable
{
public static void main (String[] args)
{
JFrame frame = new JFrame("Elements");
frame.setVisible(true);
frame.setSize(1000,1500);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
frame.add(panel);
JButton button1 = new JButton("H");
panel.add(button1);
button1.addActionListener (new Action1());
JButton button2 = new JButton("He");
panel.add(button2);
button2.addActionListener (new Action2());
JButton button3 = new JButton("Li");
panel.add(button3);
button3.addActionListener (new Action2());
}
static class Action1 implements ActionListener
{
public void actionPerformed (ActionEvent e)
{
JFrame frame2 = new JFrame("H");
frame2.setVisible(true);
frame2.setSize(1000,1500);
JLabel label = new JLabel("Hydrogen");
JPanel panel = new JPanel();
frame2.add(panel);
panel.add(label);
}
}
static class Action2 implements ActionListener
{
public void actionPerformed (ActionEvent e)
{
JFrame frame3 = new JFrame("He");
frame3.setVisible(true);
frame3.setSize(1000,1500);
JLabel label = new JLabel("Helium");
JPanel panel = new JPanel();
frame3.add(panel);
panel.add(label);
}
}
static class Action3 implements ActionListener
{
public void actionPerformed (ActionEvent e)
{
JFrame frame4 = new JFrame("Li");
frame4.setVisible(true);
frame4.setSize(1000,1500);
JLabel label = new JLabel("Lithium");
JPanel panel = new JPanel();
frame4.add(panel);
panel.add(label);
}
}
}
Thanks in advance.
(note: only the first 3 elements are coded for...)
When I execute the program and click on 'H', it opens all other elements
Only one frame opens for me.
and when the others are clicked, it does not work.
Each button opens a single frame for me.
However, button 3 opens the wrong frame because you add the wrong listener to the button:
//button3.addActionListener (new Action2());
button3.addActionListener (new Action3());
Other issues:
You should add the components to the frame BEFORE making the frame visible.
Don't hardcode screen sizes, you never know what size screen other users will be using
So the order of your code might be something like:
JLabel label = new JLabel("Helium");
JPanel panel = new JPanel();
panel.add(label);
JFrame frame3 = new JFrame("He");
frame3.add(panel);
frame3.pack();
frame3.setVisible(true);
And of course you really don't want to create dozens of separate ActionListeners. You want to make the listener more generic so it can be shared.
Something like:
static class Action implements ActionListener
{
public Action(String element, String description)
{
this.element = element;
this.description = description;
}
public void actionPerformed (ActionEvent e)
{
JLabel label = new JLabel(description);
JPanel panel = new JPanel();
panel.add(label);
JFrame frame3 = new JFrame(element);
frame3.add(panel);
frame3.pack();
frame3.setVisible(true);
}
}
Then when you create the listener you use:
button3.addActionListener (new Action("HE", "Helium"));
I am working on a semester project that I have and I was wondering if it was possible to store 3-4 JPanels instead one single "main" JPanel. The reason for me asking this is because I a trying to make a GUI checkbook program and my checkbook has 7 buttons that should open a new window once I click on it. To switch between each window I'm going to have to use the CardLayout, but my understand of the CardLayout is that I can only assign one single JPanel to that card so I can't assign multiple JPanels to a single Card layout so when the user clicks on a different card 3-4 different JPanels appear.
The reason that I am asking this is because I asked for help earlier and received help for creating my first window in this project, it produces the output I want PERFECTLY, but uses more than 1 JPanel in doing so. Since this prevents me from continuing on to the other steps of my 7 GUI Windows, I am stuck.
Here is the code:
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class checkbook extends JPanel implements ActionListener {
private static final String title = "Use The Buttons Below To Manage Transactions";
private static final String[] bottomButtons = { "Create a New Account",
"Load a Trans from a File", "Add New Transactions",
"Search Transactions", "Sort Transactions",
"View/Delete Transactions", "Backup Transaction", "Exit" };
static JButton Button[] = new JButton[8];
static ActionListener AL = new checkbook();
public checkbook() {
JLabel titleLabel = new JLabel(title, SwingConstants.CENTER);
titleLabel.setFont(titleLabel.getFont().deriveFont(Font.BOLD, 18));
JPanel titlePanel = new JPanel();
titlePanel.add(titleLabel); // put it in a JPanel so it will expand to fill BoxLayout
JTextField textfield = new JTextField();
JPanel accountBalancePanel = new JPanel();
accountBalancePanel.add(new JLabel("Account Name:"));
accountBalancePanel.add(new JTextField(10));
accountBalancePanel.add(Box.createHorizontalStrut(4));
accountBalancePanel.add(new JLabel("Balance:"));
textfield = new JTextField("0.0", 10);
textfield.setHorizontalAlignment(JTextField.RIGHT);
accountBalancePanel.add(textfield);
JPanel northPanel = new JPanel();
northPanel.setLayout(new BoxLayout(northPanel, BoxLayout.PAGE_AXIS));
northPanel.add(titlePanel);
northPanel.add(accountBalancePanel);
JPanel southBtnPanel = new JPanel(new GridLayout(2, 4, 1, 1));
for(int i = 0; i < 8; i++){
Button[i] = new JButton(bottomButtons[i]);
southBtnPanel.add(Button[i]);
Button[i].addActionListener(AL);
}
setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
setLayout(new BorderLayout());
add(northPanel, BorderLayout.NORTH);
add(Box.createRigidArea(new Dimension(100, 100))); // just an empty placeholder
add(southBtnPanel, BorderLayout.SOUTH);
}
private static void createAndShowGui() {
checkbook mainPanel = new checkbook();
JFrame frame = new JFrame("Checkbook");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
createAndShowGui();
}
});
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == Button[7]) {
System.exit(0);
}
}
}
Credit goes to Hovercraft Full Of Eels for showing me the above example
If there is anything that is unclear about my question, please ask and I will do the best I can to fix it.
Here is what the code produces:
http://i.stack.imgur.com/WY0c3.png