I'm using the Java Swing UI Designer in IntelliJ :( I designed something in the designer using multiple panels and spacers with 1 parent panel. When I add the main panel, the first one inside it shows, but the others don't.
Frame structure:
Panel1
GradientPanel
Panel
Spacers
What I designed
What I get
import keeptoo.KGradientPanel;
import javax.swing.*;
public class LogIn extends JFrame{
private KGradientPanel KGradientPanel1; //Automatically added by the designer
private JPanel panel1; //Automatically added by the designer
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setTitle("CarbonTec Dashboard");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setSize(1800,1000);
frame.setContentPane(new LogIn().panel1);
frame.setVisible(true);
ImageIcon imageIcon = new ImageIcon("Icon.png");
frame.setIconImage(imageIcon.getImage());
}
}
First you need to know that your class is a JFrame, but in the main method you create a new JFrame.
Better would be to have a class Program that has the main method. In this main method you make a new instance of LogIn.
The Program class can look like this:
public class MainProgram {
public static void main(String[] args) {
LogIn logIn = new LogIn();
}
}
The LogIn class should then look like this:
import keeptoo.KGradientPanel;
import javax.swing.*;
public class LogIn extends JFrame{
private KGradientPanel KGradientPanel1 = new KGradientPanel(); //Automatically added by the designer
private JPanel panel1 = new JPanel(); //Automatically added by the designer
// This is the constructor.
public LogIn {
setTitle("CarbonTec Dashboard");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setResizable(false);
setSize(1800,1000);
setContentPane(panel1);
ImageIcon imageIcon = new ImageIcon("Icon.png");
setIconImage(imageIcon.getImage());
// Here you can add the gradient panel to panel1.
panel1.add(KGradientPanel1); // The name should be written in lower case.
setVisible(true);
}
But I don't know why you need the panel1, you could add the KGradientPanel directly.
Related
I bought a Mac, I I download netbeans for my java.
package gui;
import javax.swing.*;
import java.awt.*;
public class Gui extends JFrame {
public void Gui(){
setTitle("Gui");
setSize(640,320);
setVisible(true);
}
public static void main(String[] args) {
new Gui();
}
}
It is very easy code and I didn't find any problem with it, but somehow the GUI is not showing up.
is GUI no suppose to show up on a Mac?
Somehow, the program didn't go through the Gui method, I tried
System.out.println("Hello");
didn't show up.
You think you're using a constructor but you are not! The constructor is what makes the app become a JFrame. This line:
public void Gui() {
should be:
public Gui() {
Also, nice to add a setMinimumSize(new Dimension(640,320));
I think the problem is you have a empty container, but I make an example for you:
import javax.swing.*;
public class Main {
private static JPanel panel1;
private static JButton button;
public static void main(String[] args) {
JFrame frame = new JFrame( "Main");
panel1 = new JPanel();
button = new JButton("Button");
panel1.add(button);
frame.setContentPane(panel1);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setTitle("Gui");
frame.setSize(640,320);
frame.setVisible(true);
}
}
I'm a complete beginner to Java, and I'm finding some answers a bit too technical for me (even the most basic tutorials seem to give me syntax errors when I run the code). How, in really simple terms do I add a JButton to a JFrame? I've got as far as:
import javax.swing.JButton;
import javax.swing.JFrame;
public class JF {
public static void main(String[] args) {
JFrame myFrame = new JFrame();
/*some pretty basic code to initialize the JFrame i.e.
myFrame.setSize(300, 200);
This is as far as I got
*/
}
}
I would seriously appreciate some help!
Creating a new JFrame
The way to create a new instance of a JFrame is pretty simple.
All you have to do is:
JFrame myFrame = new JFrame("Frame Title");
But now the Window is hidden, to see the Window you must use the setVisible(boolean flag) method. Like this:
myFrame.setVisible(true);
Adding Components
There are many ways to add a Component to a JFrame.
The simplest way is:
myFrame.getContentPane().add(new JButton());//in this case we are adding a Button
This will just add a new Component that will fill the JFrame().
If you do not want the Component to fill the screen then you should either make the ContentPane of the JFrame a new custom Container
myFrame.getContentPane() = new JPanel();
OR add a custom Container to the ContentPane and add everything else there.
JPanel mainPanel = new JPanel();
myFrame.getContentPane().add(mainPanel);
If you do not want to write the myFrame.getContentPane() every time then you could just keep an instance of the ContentPane.
JPanel pane = myFrame.getContentPane();
Basic Properties
The most basic properties of the JFrame are:
Size
Location
CloseOperation
You can either set the Size by using:
myFrame.setSize(new Dimension(300, 200));//in pixels
Or packing the JFrame after adding all the components (Better practice).
myFrame.pack();
You can set the Location by using:
myFrame.setLocation(new Point(100, 100));// starting from top left corner
Finally you can set the CloseOperation (what happens when X is pressed) by
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
There are 4 different actions that you can choose from:
DO_NOTHING_ON_CLOSE //Nothing happens
HIDE_ON_CLOSE //setVisible(false)
DISPOSE_ON_CLOSE //Closes JFrame, Application still runs
EXIT_ON_CLOSE //Closes Application
Using Event Dispatch Thread
You should initialize all GUI in Event Dispatch Thread, you can do this by simply doing:
class GUI implements Runnable {
public static void main(String[] args) {
EventQueue.invokeLater(new GUI());
}
#Override
public void run() {
JFrame myFrame = new JFrame("Frame Title");
myFrame.setLocation(new Point(100, 100));
myFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BorderLayout());
myFrame.getContentPane().add(mainPanel);
mainPanel.add(new JButton("Button Text"), BorderLayout.CENTER);
myFrame.pack();
myFrame.setLocationByPlatform(true);
myFrame.setVisible(true);
}
}
//I hope this will help
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JPanel;
public class JF extends JFrame
{
private JButton myButton;//Here you begin by declaring the button
public JF()//Here you create you constructor. Constructors are used for initializing variable
{
myButton = new JButton();//We initialize our variable
myButton.setText("My Button"); //And give it a name
JPanel panel1 = new JPanel();//In java panels are useful for holding content
panel1.add(myButton);//Here you put your button in the panel
add(panel1);//This make the panel visible together with its contents
setSize(300,400);//Set the size of your window
setVisible(true);//Make your window visible
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args)
{
JFrame frame = new JF();
frame.setTitle("My First Button");
frame.setLocation(400,200);
}
}
I have 2 jframes, 1 is kinda like the main menu, i want an attribute to change in the level jframe when a button is pressed so i tried:
SpeelVeld frame = new SpeelVeld();
frame.level = 1;
System.out.println(frame.level);
I used the sout to see what really happens because it wasnt working, but i see that the level goes from 0 to 1 back to 0 and goes on and on, does someone know why and how to fix?
SpeelVeld frame = new SpeelVeld();
frame.setBounds(0,0,519,591);
frame.setLocationRelativeTo(null);
frame.getContentPane().setBackground(Color.WHITE);
frame.setTitle("RWINA");
frame.setVisible(true);
frame.setLevel(1);
this is in the main method of my original GameProject file.
How can i make a jdialog
I have 2 jframes, 1 is kinda like the main menu,
You shouldn't use 2 JFrames for this. The dependent sub-window, likely your main menu window, should in fact be a JDialog, probably a non-modal dialog from the looks of it.
I want an attribute to change in the level jframe when a button is pressed so i tried:
SpeelVeld frame = new SpeelVeld();
frame.level = 1;
System.out.println(frame.level);
and here's a big problem. Understand that in this code, you're creating a new SpeelVeld object, the stress being on the word new. Changing the state of this object will have no effect on the other SeelVeld object that is currently being displayed. Do do that, your second window will need a valid reference to the displayed SeelVeld object. How to do this will depend all on code not yet shown, but often it can be done simply by passing in the displayed SpeelVeld object into the main menu object by use of a constructor parameter or setter method.
For example:
import java.awt.Dialog.ModalityType;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
// JPanel for our main GUI
public class SpeelVeldFoo {
private static void createAndShowGui() {
// JPanel used by the main JFrame
SpeelVeldPanel speelVeldPanel = new SpeelVeldPanel();
// JPanel used by the main menu JDialog. Pass the above into it
MainMenuPanel mainMenuPanel = new MainMenuPanel(speelVeldPanel);
// create your JFrame
JFrame frame = new JFrame("Speel Veld");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(speelVeldPanel); // add the JPanel
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
// create your non-modal JDialog
JDialog menuDialog = new JDialog(frame, "Main Menu", ModalityType.MODELESS);
menuDialog.add(mainMenuPanel); // add the JPanel that holds its "guts"
menuDialog.pack();
menuDialog.setLocationByPlatform(true);
menuDialog.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
createAndShowGui();
});
}
}
#SuppressWarnings("serial")
class SpeelVeldPanel extends JPanel {
private int level = 1; // simple example just has a level int
private JLabel levelLabel = new JLabel("1"); // and displays it in a JLabel
public SpeelVeldPanel() {
add(new JLabel("Level:"));
add(levelLabel);
int ebGap = 50;
setBorder(BorderFactory.createEmptyBorder(ebGap, 2 * ebGap, ebGap, 2 * ebGap));
}
public int getLevel() {
return level;
}
public void setLevel(int level) {
// whenever level is changed, update the display
this.level = level;
levelLabel.setText(String.valueOf(level));
}
}
// class for the JPanel held by the JDialog
#SuppressWarnings("serial")
class MainMenuPanel extends JPanel {
private JSpinner levelSpinner = new JSpinner(new SpinnerNumberModel(1, 1, 5, 1));
private SpeelVeldPanel speelVeldPanel = null; // reference to the main GUI
// note the parameter.... you pass in the displayed main GUI so you can
// change it
public MainMenuPanel(final SpeelVeldPanel speelVeldPanel) {
this.speelVeldPanel = speelVeldPanel; // set the field
// respond when the spinner's data changes
levelSpinner.addChangeListener(new LevelListener());
add(new JLabel("Set the Speel Veld's level:"));
add(levelSpinner);
int ebGap = 10;
setBorder(BorderFactory.createEmptyBorder(ebGap, ebGap, ebGap, ebGap));
}
private class LevelListener implements ChangeListener {
#Override
public void stateChanged(ChangeEvent e) {
// when the spinner's data changes
int level = (int) levelSpinner.getValue(); // get the data
speelVeldPanel.setLevel(level); // and send it to the main GUI
}
}
}
You'll note that I don't like extending JFrame or JDialog if I can avoid it. My feeling is that one can paint oneself into a corner by having your class extend JFrame, forcing you to create and display JFrames, when often more flexibility is called for. More commonly your GUI classes will be geared towards creating JPanels, which can then be placed into JFrames or JDialogs, or JTabbedPanes, or swapped via CardLayouts, wherever needed. This will greatly increase the flexibility of your GUI coding.
You probably want the JFrame to be the top-level container, then have a JPanel that holds your menu. The menu could be whatever you want, I'm using a JTextArea. Then, you need a JButton for the JPanel or JFrame that when pressed, changes the text in the JTextArea. Here is an implementation that you could work from. I'm using the ActionEvent as the trigger for when to mess with the JTextArea:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class SimpleSwing {
public static void main(String[] args) {
JFrame mainFrame = new JFrame();
JPanel mainMenuPanel = new JPanel();
JTextArea textAttribute = new JTextArea("Original Text");
JButton changeAttributeButton = new JButton("Change Attribute");
changeAttributeButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
textAttribute.setText("Whatever new text you want");
}
});
mainMenuPanel.add(textAttribute);
mainMenuPanel.add(changeAttributeButton);
mainFrame.add(mainMenuPanel);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setSize(500, 500);
mainFrame.setVisible(true);
}
}
I want to know how to put put console output into a JFrame. For example, putting this output into a JFrame:
import static java.lang.System.out;
public class frame{
public static void main(String [] args){
out.println("hello");
}
}
How is it possible?
You need to set up the JFrame first.
JFrame frame = new JFrame("title");
Then, set the properties of the JFrame:
frame.setSize(1280,720); //Sets the program's size
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Tells the program to exit on close
frame.setResizable(true); //Tells the program if resizing is enabled
Then, create a panel to store the components:
JPanel p = new JPanel();
After that, you must add the panel to the JFrame like so:
frame.add(p);
Then, with that done, you can use the components supplied in the swing framework, and add them to the panel. A reference for these components can be found here: http://docs.oracle.com/javase/tutorial/uiswing/components/componentlist.html.
To create a component, use the following code:
JLabel label = new JLabel();
Then, use it's build in functions to change it:
label.setText("new text");
Then, once again, to add a component to a panel, use the panel's add() method:
panel.add(label);
Those are just the basics of making a GUI with java. A full tutorial can be viewed here:
http://docs.oracle.com/javase/tutorial/uiswing/
Good Luck!
I can help you with this, but let me please fix some syntax errors you have. When you put the import, an import can't be static (that I know of) and when you want to print out something using "System.out.print" or "System.out.println" you MUST include the "System" part of the line. If you want to add text to a a JFrame use the JLabel to import both just do this bit of code:
import javax.swing.*;
That should import all of your swing elements such as JLabel and JFrame and JPanel, and try this code it will make a window that will have a button and a label. The button doesn't do anything in this code:
import javax.swing.*;
public class main{
public static void main(String[] args)
{
/*
* Creates the frame, makes it visible, and makes
* appear in the center of the screen. While also making it have a close operation
*/
JFrame frame = new JFrame("Button");
frame.setVisible(true);
frame.setSize(300, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
//Creates the panel, and adds it to the frame
JPanel panel = new JPanel();
frame.add(panel);
//Creates the label and adds it to the panel, also sets the text
JLabel label = new JLabel();
label.setText("Welcome" + "\n" + "\n");
panel.add(label);
//Creates the button and adds it to the panel
JButton button1 = new JButton("Button 1");
panel.add(button1);
}
}
1.If you want to use JFrame you have to extend your class to a subclass of JFrame:
public class frame extends JFrame {}
2.a)If you want to put Text in your Frame use JLabel and add it to your frame:
JLabel hello = new JLabel("Hello");
add(hello);
2.b)If you want a console output just call System.out.println() in the constructor
Here is a small example class:
import javax.swing.JFrame;
import javax.swing.JLabel;
public class Frame extends JFrame {
public static void main(String args[]) {
new Frame();
}
Frame() {
System.out.println("Hello");
JLabel hello = new JLabel("Hello");
add(hello);
this.setSize(100, 100);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
}
have a look to the oracle lessons... or any java book!
If that is the case, I don't want to get into GUI just yet. (Learning from a book) Can I convert my current project to a jar file and have it automatically open a command prompt window upon double click?
I have drawn a rectangle using a JPanel
My main objective is to store my Requirement Engineering chapter into a JPanel or a JFrame
import java.awt.*;
import javax.swing.*;
class RequirementEngineering extends JPanel
{
public void paintComponent(Graphics g)
{
super.paintComponent();
g.drawRect(10,10,60,60);
g2.drawString("Feasibility study", 20, 20); //rectangle is my main objective, I will look after the string later
}
public static void main(String[] args)
{
}
}
how do I display the JPanel? I know, JApplet doesn't require a main method, but how do we represent JPanel in main() method?
I have this doubt for long, and other posts are confusing me further, Could I have a direct question
My main question being "How to add JFrame to JPanel" pertaining my current coding
thanks in advance
see if you need to use a Window based app, you can do as:
JPanel customPanel = new RequirementEngineering();
JFrame frame = new JFrame("my window");
frame.getContentPane().add(customPanel );
frame.setSize(300,200);
frame.setVisible(true);
If you need in Applet,
public class JAppletExample extends JApplet {
public void init() {
Container content = getContentPane();
JPanel customPanel = new RequirementEngineering();
content.add(customPanel );
}
And you can run it using appletViewer or in any Web Browser such as IE.