Java 更改JComboBox箭头'；背景色

我发现：

如何准确地“将图标绘制到BuffereImage的图形上下文”？

如下所示：

    int componentCount = comboBox.getComponentCount();
    for (int i = 0; i < componentCount; i++) {
        Component component = comboBox.getComponent(i);
        if (component instanceof MetalComboBoxButton) {
            MetalComboBoxButton metalComboBoxButton =
                (MetalComboBoxButton) component;
            Icon comboIcon = metalComboBoxButton.getComboIcon();
            BufferedImage bufferedImage =
                new BufferedImage(
                    comboIcon.getIconWidth(),
                    comboIcon.getIconHeight(),
                    BufferedImage.TYPE_INT_ARGB);
            comboIcon.paintIcon(
                metalComboBoxButton, bufferedImage.getGraphics(), 0, 0);
        }
    }

int componentCount=comboBox.getComponentCount（）；
对于（int i=0；i< /代码> 作为替代，考虑使用<代码> CuBoBOXUI中的自定义实例，如下面所示。

    int componentCount = comboBox.getComponentCount();
    for (int i = 0; i < componentCount; i++) {
        Component component = comboBox.getComponent(i);
        if (component instanceof MetalComboBoxButton) {
            MetalComboBoxButton metalComboBoxButton =
                (MetalComboBoxButton) component;
            Icon comboIcon = metalComboBoxButton.getComboIcon();
            BufferedImage bufferedImage =
                new BufferedImage(
                    comboIcon.getIconWidth(),
                    comboIcon.getIconHeight(),
                    BufferedImage.TYPE_INT_ARGB);
            comboIcon.paintIcon(
                metalComboBoxButton, bufferedImage.getGraphics(), 0, 0);
        }
    }