单击按钮更改图标。 爪哇

Question

I use Netbeans to make a Java application. I am still a beginner. I have 4 buttons and I want to change an icon, when a user click one of them. I have already put buttons and one icon but I have no idea on how to continue.

Answer 1

You will need an ActionListener that changes the icon (use an ImageIcon for this). Add that ActionListener to the Button which should be responding to a click, with that action.

button.addActionListener(/*here your listener*/);

Answer 2

Are you using the windowbuilder of netbeans? If yes, check the generated code for your specified button and see how they did it :)

Answer 3

Ok, i created a new JFrame Form to my package called TestFrame.

public class TestFrame extends javax.swing.JFrame {

        static public ImageIcon imageCross; 
        static public ImageIcon imageCircle;


        URL cross = TestFrame.class.getResource("cross.jpg");
        URL circle = TestFrame.class.getResource("circle.jpg");

        boolean clicked = true;
    /**
     * Creates new form TestFrame
     */
    public TestFrame() {
        imageCross = new javax.swing.ImageIcon(cross);
        imageCircle = new javax.swing.ImageIcon(circle);
        initComponents();
    }
    ...

This is just how i declare my images.

Now i need to change them when i click on a button.

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    if(clicked) {
        jButton1.setIcon(imageCircle);
        clicked = false;
    } else {
        jButton1.setIcon(imageCross);
        clicked = true;
    }

} 

Just add all your images you need. Add for every single JButton a actionPerformed() and switch your icons with a if-condition or maybe switch/case ( if you have more).