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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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I'm creating a game that uses buttons. I want to disable a button once it's been selected, so that it cannot again until the game has restarted, but I'm having trouble achieving this. Could some let me know how to go about doing this?
public void actionPerformed(ActionEvent e) {
if (q==2) {
label2.setText("Correct!"); }
else {
label2.setText("Wrong!!");
}}
You can get the source of the event from the ActionEvent with getSource. Then cast it to the correct type, and disable it with setEnabled
Here's an example, assuming you're using JButton
public void actionPerformed(ActionEvent e) {
if (q==2) {
label2.setText("Correct!");
} else {
label2.setText("Wrong!!");
}
if(e.getSource() instanceof JButton) {
((JButton)e.getSource()).setEnabled(false);
}
}
Call button.setEnabled(false) to disable it, and button.setEnabled(true) to reinstate it.
What's the trouble? I trust you've taken a look at the JButton documentation (assuming you're using JButtons). Using this function will allow you to enable/disable buttons.
JButton.setEnabled(boolean)
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My Images are in JLabels and they follow a MouseListener but I don't know what to add in the mousePressed(Event e) method to change the JLabel with another image ??
JLabel has setIcon() method. You can use it to change the picture your label shows.
For example:
JLabel myLabel = new JLabel(imageOne);
myLabel.addMouseListener(new MouseAdaper() {
public void mousePressed(MouseEvent e) {
ImageIcon image2 = new ImageIcon("image2.png");
myLabel.setIcon(image2);
}
});
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I would like to make a simple component that does nothing other than draw an arbitrary image, and then directly beneath it place a JLabel for displaying arbitrary text.
How can I achieve this? I'm brand new to Swing and I'm trying to learn as I go, but I don't currently understand how I would go about doing this. I know it's a basic question, and I appreciate any help I can get.
JLabel is your friend:
JLabel label = new JLabel("Your text here");
label.setHorizontalTextPosition(SwingConstants.CENTER);
label.setVerticalTextPosition(SwingConstants.BOTTOM);
label.setIcon(new ImageIcon(this.getClass().getResource("/path/to/image/image.jpg")));
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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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I have a main JFrame with a button that generates another JFrame. However, when I close the 2nd JFrame the main JFrame is also closed which is not what I want. What am I doing wrong?
I assume you're setting the default closing action as:
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
The JFrame.EXIT_ON_CLOSE constant terminates the whole program when you click the x button. You probably want to use DISPOSE_ON_CLOSE or HIDE_ON_CLOSE instead. I recommend to have a look at the JavaDoc of JFrame.