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I'm afraid I don't have any code because I don't really know what I'm doing. I'm trying to learn some Java by creating a basic game and want to make a menu. What I want to do is have a class with a custom JButton (basically a JButton of a certain size and a picture on the background, formatted specially, etc.) which can be called from another class and given custom text when it is called. My question is, how do I create the custom button which can be called externally?
create a class and extend it to JButton like below and there you can change all sort of things that has to do with JButton.
import javax.swing.JButton;
public class CustomJButton extends JButton {
public CustomJButton() {
this.setText("Custom JButton");
// initialize
}
// add your own methods or override JButton methods
public void myFunc(){
}
}
In the constructor for your custom JButton, you'll want to accept a parameter that specifies the text you want the button to contain, and you'll specify the other things that you don't want to change from instance to instance, such as the size or the background image.
import javax.swing.*;
class MyButton extends JButton{
public MyButton(String text){
super(text);
...set size, add background image, etc...
}
}
No this button is a JButton you can create a new one
like normally, MyButton btn = new MyButton(); You just added an extra method that will format it the way you want. If you want to learn more about this topic look at object inheritance.
public MyButton extends JButton{
public void doStuff(){
this.setBackground("yourBackground");
...
}
}
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I am fairly new to programming as I am only in a Computer Science class in high school. I have thought of the idea of creating a chess program that basically simulates a game of chess. To do this I figured I would have the users click on the spot that they would want to move to.
I have looked all over the internet, including java's API's, and I have found some very useful information. After all of this however, I am still very confused about all of the different methods and classes as well as interfaces to use to create and use Buttons in Java. Although this isn't a question about code(Sorry), I was wondering if anybody knew of any tutorials that would be suitable for my situation. All I am looking for is something that can show me how to create and use a simple, one function button. Preferably, it would be nice if it describes all of the methods so that I actually understand what I am doing.
Again, sorry this isnt a question about code. I couldn't think of a better place to ask this question, than Stack Overflow so please do not down-vote this "question".
Thanks
Here is a totally self contained example (with some code comments to help you understand what is going on):
//Here I am using Swing and AWT (a rather standard way to manage UI elements in Java though technically not the only way)
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
//Here is a base class that extends JFrame, JFrames are containers for Swing UI widgets that are represented as windows when executed
public class ButtonExample extends JFrame {
private static final long serialVersionUID = 1L;
public static void main(String[] args) {
//Creatign the frame
ButtonExample frame = new ButtonExample();
//Creating the button with the label "Click me!"
JButton button = new JButton("Click me!");
//Adding an action listener so we can assign some logic to be executed when this button is clicked on (this is using an anonymous inner class in future versions of Java this will be replaced by the MUCH cleaner Lamba approach, keep an eye out for that)
button.addActionListener(new ActionListener() {
//Keep a variable to store how many times the button is clicked. This shows that the action listener stays running in between clicks)
private int count = 0;
//While technically optional thew #Override annotation helps if you update interfaces, get into the habit of doing this to make future work easier, things like Eclipse will insert it for you
#Override
public void actionPerformed(ActionEvent e) {
//Bump up the count variable
this.count++;
//And print it to System.out
System.out.println("Pressed "+this.count + " times");
}
});
//Add the button (with it's listener) to the frame
frame.add(button);
//Tell Swing to resize the frame to fit the requested size of all of it's contained widgets
frame.pack();
//Tell Swing to show the frame
frame.setVisible(true);
}
}
Try:
JButton button = new JButton("Click me");
button.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
//Do what you like here after button is clicked, for example:
System.out.println("Button clicked");
}
});
someJPanel.add(button);
To make such application - you will need lot's of knowledge. Also it should look nice, so lot's of work with graphics in Java..
Try to read this documentation: Here You Are
There, you can download, launch the example, so you can see, try every button..
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I am working on an assignment in which I need to combine two programs that I have created into one functioning program. The end result I am hoping for is a program that once launched, opens a log in window, then once logged in, the user gets to play a tic tac toe game. Basically I just was wonder how to have a window within which when you click a button, a new window opens that can run extensive code.
If you're using Swing framework, Create a second JFrame and set its visibility to false, and when the button is clicked, set it visibility to true.
public class MyFrame extends JFrame {
private JButton jbt = new JButton("Open Window");
private AnotherFrame jfrm = new AnotherFrame();
public MyFrame(){
add(jbt);
jfrm.setVisibility(false);
add(jfrm);
jbt.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
jfrm.setVisibility(true);
}
});
}
private AnotherFrame extends JFrame {
public AnotherFrame(){
}
}
}
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In Java's swing package, I was wondering how to detect when a JButton is pressed. Is there a function that is called when the button is pressed? Thanks
Yes, when you deal with button pressing, you want to add what is known as an action listener. First, you must
import java.awt.event.ActionListener;
then you can do the following
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
// this makes sure the button you are pressing is the button variable
if(e.getSource() == button) {
// do action necessary code
}
}
});
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Just can't figure this out in my GUI, I know it's probably simple but thought I'd ask.
I assume I need something in this code:
public static void main(String args[]) {
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new myGUI().setVisible(true);
}
});
}
Thanks.
Edit - for some reason public static etc. isn't showing up above - but you probably don't need that.
You're not showing us the whole code, so this is only a guess, but probably a good one: I assume that myGUI is a subclass of JFrame, and you want to call setTitle() on it. Something like
myGUI m = new myGUI();
m.setTitle("The Title");
m.setVisible(true);
You'd put these three lines in place of the one new myGUI().setVisible(true); .
If you are in Netbeans do you have a screen/form in which you have been designing your Frame?
If so open the navigator toolbar and right click on your frame, select properties and look for the one called title, and type in your text there.
Otherwise you will need to add something like
myGui.setTitle("A title") // assuming its a JFrame
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As a contrast to this wiki, I am looking for the proper way to implement Swing GUI controls from a coding standpoint.
I have been on a quest to learn Java and its GUI tools but I find internet tutorial after internet tutorial that throws everything in main and I know this isn't right.
I've also tried RAD systems like Netbeans and other "visual" editors but by the time I get to coding I've got a heap of code that I don't know half of what it does, so I'm intent on learning to hand code swing, and I know the basic controls and layout, but want to do it the right way.
Is there a model or standard I'm missing?
example questions...
do I extend JFrame and create my own frame object? (I would assume yes)
do I encapsulate the main menu inside that frame object? or do I create its own? etc...
How to I separate "View" logic from "Application" logic?
Basically, I'm looking for what the industry standard is, on how to organize GUI code.
Since there seems to be some argument about what constitutes "best practices", I'll give you what I have found works best for me, and my reasoning:
1.
Each window should extend either JFrame or JDialog (depending on the type of window). This makes it easy to control the properties of the window without specifying a specific object every time. This is more of the general case, though, as I have been known to do it both ways.
2.
The main() method should be in a separate class. This increases the likelihood of being able to use your window classes elsewhere, as they are not tied to specific implementations. Technically it doesn't make a difference, but application startup code just doesn't belong in a window.
3.
Listeners should be in anonymous inner classes. Your top-level class should not implement any listeners. This prevents hacks like calling the listener methods from anywhere except the object to which they are attached.
Here is a simple application with a single frame to demonstrate these practices:
public class Main {
public static void main(String[] args) {
final String text = args[0];
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
final MyWindow wnd = new MyWindow(text);
wnd.setVisible(true);
}
});
}
}
public class MyWindow extends JFrame {
public MyWindow(String text) {
super("My Window");
setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
addWindowListener(new WindowAdapter() {
#Override
public void windowClosing(WindowEvent e) {
MyWindow.this.setVisible(false);
MyWindow.this.dispose();
}
});
final JButton btn = new JButton(text);
btn.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(MyWindow.this, "Button Pressed", "Hey", JOptionPane.INFORMATION_MESSAGE);
}
});
setLayout(new FlowLayout());
add(btn);
pack();
}
}
I agree with all of Jonathan's points.
Each window should extend either JFrame or JDialog...
The main() method should be in a separate class...
Listeners should be in anonymous inner classes...
I would also like to add the following:
Use GridBagLayout (GBL) judiciously. GBL is a powerful Layout Manager, difficult to learn, but quite powerful.
Consider hand coding all your UI. I'm personally not a fan of the code that is produced by visual editors. But, with that said I have not used a visual editor in several years (2000ish). They might be better at this point.
Use JPanels judiciously. Look at your ui and determine which components should behave the same as the screen size changes and then group those components together on a JPanel. Consider using JPanels inside of JPanels to get your correct resizing behavior.
I normally take a slightly different approach on having my components handle events then Jonathan does, but I believe his approach is a bit cleaner then mine.
Also, really study the use of MVC and Layered Architecture. It is truly best not to be mixing UI and Business Logic together.