java.lang.ArrayIndexOutOfBoundsException : 9 error 异常

Question

关于这个post .我试图显示 9 个图标，9 个文本字段，但出现错误

java.lang.ArrayIndexOutOfBoundsException: 9

标签代码如下

static void addIt(JTabbedPane tabbedPane, String text) throws IOException {

        JPanel panel = new JPanel(new GridBagLayout());
        gbc = new GridBagConstraints();

        foodLabel = new JLabel[ELEMENTS];
        qtyField = new JTextField[ELEMENTS];
        file = new File[ELEMENTS];
        imageIcon = new ImageIcon[ELEMENTS];
        image = new BufferedImage[ELEMENTS];

        for (int i = 0; i < ELEMENTS; i++) {
            try {
                file[i] = new File("C:\\Users\\tony\\Desktop\\MedSalad.png");
                file[i + 1] = new File("C:\\Users\\tony\\Desktop\\JapanesePanNoodles.png");
                file[i + 2] = new File("C:\\Users\\tony\\Desktop\\Spaghetti.png");
                file[i + 3] = new File("C:\\Users\\tony\\Desktop\\PadThai.png");
                file[i + 4] = new File("C:\\Users\\tony\\Desktop\\RamenNoodles.png");
                file[i + 5] = new File("C:\\Users\\tony\\Desktop\\SpaghettiAndMeatBalls.png");
                file[i + 6] = new File("C:\\Users\\tony\\Desktop\\chickenRice.jpg");
                file[i + 7] = new File("C:\\Users\\tony\\Desktop\\thaiFood.jpeg");
                file[i + 8] = new File("C:\\Users\\tony\\Desktop\\vietnamFood.jpg");

                image[i] = ImageIO.read(file[i]);
                imageIcon[i] = new ImageIcon(image[i]);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

         for (int i = 0; i < ELEMENTS; i++) {
            foodLabel[i] = new JLabel(imageIcon[i]);
            qtyField[i] = new JTextField(3);
         }
            gbc.gridx =0;
            for (int i = 0; i < ELEMENTS; i++) {
                if (i % 3 == 0) {
                    gbc.gridy += 2;
                    gbc.gridx = 0;
                }
                panel.add(foodLabel[i], gbc);
                gbc.gridy++;
                panel.add(qtyField[i], gbc);
                gbc.gridx++;
                gbc.gridy--;
                tabbedPane.addTab(text, panel);
    }
} 

错误指向

file[i + 1] = new File("C:\\Users\\tony\\Desktop\\JapanesePanNoodles.png");

Answer 1

您将 file 定义为:

    file = new File[ELEMENTS];

然后像这样访问它:

    for (int i = 0; i < ELEMENTS; i++) {
        try {
            file[i] = new File("C:\\Users\\tony\\Desktop\\MedSalad.png");
            file[i + 1] = new File("C:\\Users\\tony\\Desktop\\JapanesePanNoodles.png");
            file[i + 2] = new File("C:\\Users\\tony\\Desktop\\Spaghetti.png");
            file[i + 3] = new File("C:\\Users\\tony\\Desktop\\PadThai.png");
            file[i + 4] = new File("C:\\Users\\tony\\Desktop\\RamenNoodles.png");
            file[i + 5] = new File("C:\\Users\\tony\\Desktop\\SpaghettiAndMeatBalls.png");
            file[i + 6] = new File("C:\\Users\\tony\\Desktop\\chickenRice.jpg");
            file[i + 7] = new File("C:\\Users\\tony\\Desktop\\thaiFood.jpeg");
            file[i + 8] = new File("C:\\Users\\tony\\Desktop\\vietnamFood.jpg");

            image[i] = ImageIO.read(file[i]);
            imageIcon[i] = new ImageIcon(image[i]);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

当 i 为 ELEMENTS - 1 时，file[i + 1] 将为 file[ELEMENTS] ，这将超出范围，因为数组中的最后一个元素的索引为 ELEMENTS - 1

你可能想做的是:

    file = new File[ELEMENTS];
    ...
    file[0] = new File("C:\\Users\\tony\\Desktop\\MedSalad.png");
    file[1] = new File("C:\\Users\\tony\\Desktop\\JapanesePanNoodles.png");
    file[2] = new File("C:\\Users\\tony\\Desktop\\Spaghetti.png");
    file[3] = new File("C:\\Users\\tony\\Desktop\\PadThai.png");
    file[4] = new File("C:\\Users\\tony\\Desktop\\RamenNoodles.png");
    file[5] = new File("C:\\Users\\tony\\Desktop\\SpaghettiAndMeatBalls.png");
    file[6] = new File("C:\\Users\\tony\\Desktop\\chickenRice.jpg");
    file[7] = new File("C:\\Users\\tony\\Desktop\\thaiFood.jpeg");
    file[8] = new File("C:\\Users\\tony\\Desktop\\vietnamFood.jpg");

    for (int i = 0; i < ELEMENTS; i++) {
        try {
            image[i] = ImageIO.read(file[i]);
            imageIcon[i] = new ImageIcon(image[i]);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }