Swing - przekazywanie stringów

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Witam wszystkich,

Mój problem jest zapewne dosyć trywialny, ale jestem początkującym dlatego proszę o wyrozumiałość. Jednocześnie z góry dziękuję za każdą sugestię i uwagę.

Mam dwie klasy, pierwsza GUI.java zawiera interfejs graficzny, ot zwykły JFrame z jednym Panelem i dwoma buttonami. Drugą pobrałem ze strony oracle'a (http://docs.oracle.com/javase[...]wing/components/combobox.html) - to ta o nazwie CustomComboBox.java. Klasa ta, wyświetla zdjęcia zwierzątek. Dodałem ją na JPanel i wszystko działa poprawnie. Wygląda tak:

user image

Problem w tym, że chciałbym za pomocą buttonów zmieniać ścieżkę dostępu do tych obrazków. W klasie CustomComboBox tworzę scieżkę tak:

String path = "images/";
(...)
images[i] = createImageIcon(path + petStrings[i] + ".gif");

I właśnie w klasie GUI, w metodach obsługujących buttony chciałbym zmieniać wartość tego stringa path. Jak to poprawnie zrobić? Poniżej zamieszczam kod źródłowy dla obydwu klas.

pozdrawiam,
Remi

CustomComboBox.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CustomComboBoxDemo extends JPanel {
    ImageIcon[] images;
    String[] petStrings = {"1", "2", "3"};
    String path = "images/";

    public CustomComboBoxDemo() {
        super(new BorderLayout());

        //Load the pet images and create an array of indexes.
        images = new ImageIcon[petStrings.length];
        Integer[] intArray = new Integer[petStrings.length];
        for (int i = 0; i < petStrings.length; i++) {
            intArray[i] = new Integer(i);
            images[i] = createImageIcon(path + petStrings[i] + ".gif");
            if (images[i] != null) {
                images[i].setDescription(petStrings[i]);
            }
        }

        //Create the combo box.
        JComboBox FacePartList = new JComboBox(intArray);
        ComboBoxRenderer renderer= new ComboBoxRenderer();
        renderer.setPreferredSize(new Dimension(250, 250));
        FacePartList.setRenderer(renderer);
        FacePartList.setMaximumRowCount(3);

        //Lay out the demo.
        add(FacePartList, BorderLayout.PAGE_START);
        setBorder(BorderFactory.createEmptyBorder(2,2,2,2));
    }

    /** Returns an ImageIcon, or null if the path was invalid. */
    protected static ImageIcon createImageIcon(String path) {
        java.net.URL imgURL = CustomComboBoxDemo.class.getResource(path);
        if (imgURL != null) {
            return new ImageIcon(imgURL);
        } else {
            System.err.println("Couldn't find file: " + path);
                return null;
        }
    }

class ComboBoxRenderer extends JLabel
                           implements ListCellRenderer {
        private Font uhOhFont;

        public ComboBoxRenderer() {
            setOpaque(true);
            setHorizontalAlignment(CENTER);
            setVerticalAlignment(CENTER);
        }

        /*
         * This method finds the image and text corresponding
         * to the selected value and returns the label, set up
         * to display the text and image.
         */
        public Component getListCellRendererComponent(
                                           JList list,
                                           Object value,
                                           int index,
                                           boolean isSelected,
                                           boolean cellHasFocus) {
            //Get the selected index. (The index param isn't
            //always valid, so just use the value.)
            int selectedIndex = ((Integer)value).intValue();

            if (isSelected) {
                setBackground(list.getSelectionBackground());
                setForeground(list.getSelectionForeground());
            } else {
                setBackground(list.getBackground());
                setForeground(list.getForeground());
            }

            //Set the icon and text.  If icon was null, say so.
            ImageIcon icon = images[selectedIndex];
            String pet = petStrings[selectedIndex];
            setIcon(icon);
            if (icon != null) {
                setText(pet);
                setFont(list.getFont());
            } else {
                setUhOhText(pet + " (no image available)",
                            list.getFont());
            }

            return this;
        }

        //Set the font and text when no image was found.
        protected void setUhOhText(String uhOhText, Font normalFont) {
            if (uhOhFont == null) { //lazily create this font
                uhOhFont = normalFont.deriveFont(Font.ITALIC);
            }
            setFont(uhOhFont);
            setText(uhOhText);
        }
    }
}

GUI.java

import javax.swing.ComboBoxModel;
import javax.swing.JComponent;
import javax.swing.JFrame;

public class GUI extends JFrame {

    /** Constructor */
    public GUI() {
        initComponents();
    }

    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();

        setDefaultCloseOperation(3);

        // combobox layout
        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(
                jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(jPanel1Layout.createParallelGroup(
                javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 266,
                Short.MAX_VALUE).addComponent(combobox));
        jPanel1Layout.setVerticalGroup(jPanel1Layout.createParallelGroup(
                javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 274,
                Short.MAX_VALUE).addComponent(combobox));
        // end combobox layout

        jButton1.setText("jButton1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton2.setText("jButton2");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(
                getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(layout
                .createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(
                        javax.swing.GroupLayout.Alignment.TRAILING,
                        layout.createSequentialGroup()
                            .addContainerGap()
                            .addComponent(jPanel1,javax.swing.GroupLayout.PREFERRED_SIZE,javax.swing.GroupLayout.DEFAULT_SIZE,                                      javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED,49, Short.MAX_VALUE)
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                                                .addComponent(jButton1)
                                                .addComponent(jButton2))
                                .addContainerGap()));
        layout.setVerticalGroup(layout
                .createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(
                        layout.createSequentialGroup()
                                .addGap(67, 67, 67)
                                .addComponent(jButton1)
                                .addPreferredGap(
                                        javax.swing.LayoutStyle.ComponentPlacement.RELATED,
                                        94, Short.MAX_VALUE)
                                .addComponent(jButton2).addGap(89, 89, 89))
                .addGroup(
                        layout.createSequentialGroup()
                                .addContainerGap()
                                .addComponent(jPanel1,
                                        javax.swing.GroupLayout.DEFAULT_SIZE,
                                        javax.swing.GroupLayout.DEFAULT_SIZE,
                                        Short.MAX_VALUE).addContainerGap()));

        pack();
    }// end:initComponents

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }

    //main
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new GUI().setVisible(true);
            }
        });
    }

    // Variables declaration
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JPanel jPanel1;
    // End of variables

}
1
      private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
                // TODO add your handling code here:
        }

        private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
                // TODO add your handling code here:
        }

W tym miejscu musisz zaprogramować obsługę przycisków. Jeżeli chodzi o wybór ścieżki to poszukaj informacji o JFileChooser.

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