无法动态更改面板 [英] Unable to Dynamically Change panel

问题描述

我有2个面板.第一个面板有一个组合框.根据所选组合框中项目的值，它下面的面板必须更改.在组合框的动作侦听器中，当我尝试更改面板时，它不会更改.为什么会这样?

I have 2 panels. The first panel has a combo box. depending on the value of the item in the combobox selected, a panel below it must change. in the action listener of the combo box, when I try to change the panel, it does not change. Why is this?

cb1.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            String s = (String) cb1.getSelectedItem();
            if (s.equals("Invoice")) {
                panel3Customizera();
                g.gridy = 2;
                remove(panel3);
                add(panel3, g);
            } else {
                panel3Customizerb();
                g.gridy = 2;
                add(panel3, g);
            }

        }
    });

panel3customizer的add元素添加到panel3中.panel3被添加到jframe中.可以找到整个代码的链接在这里

panel3customizer's add elements into panel3.panel 3 is added to a jframe. The link to the entire code can be found here

推荐答案

像底部JPanel这样的声音应该使用如何使用CardLayout 的教程.

Sounds like the bottom JPanel ought to be using CardLayout. Here's a tutorial on How to Use CardLayout.

@Hovercraft Full Of Eels 是他的推荐调用 revalidate() 和 repaint() 在容器对象上，因为这将导致它再次布局其组件并删除所有可视的工件".

And @Hovercraft Full Of Eels is right in his recommendation to invoke revalidate() and repaint() on the container object, since this will cause it to layout its components again and remove any visual "artifacts".

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