当我最小化框架时面板组件消失 [英] Panel components disappear when I minimize frame

问题描述

我有一个带有主面板的布局，其内容由我通过按钮通过以下方式确定:

I have a layout with a main panel whose content is decided by me throught buttons in this way:

public void actionPerformed(ActionEvent e) {
    mainPanel.removeAll(); //removing all current panel components
    if(e.getActionCommand().equals("content1")){
        mainPanel = new Content1Panel();
        add(mainPanel,BorderLayout.CENTER);
        validate();
    }else if(e.getActionCommand().equals("content2")){
        mainPanel = new Content2Panel();
        add(mainPanel,BorderLayout.CENTER);
        validate();
            }
}

现在，如果我最小化框架，然后将其放到最前面，我发现所有主面板的组件都消失了！无论如何，当我将鼠标悬停在它们上面时，鼠标组件再次显示出来. 怎么了?

now, if I minimize the frame and then bring it to front I find all main panel's components disappeared! Anyway, when I hover on them with the mouse components show again. What is wrong?

推荐答案

• 用于JFrame/JDialog/JWindow
• for JFrame / JDialog / JWindow

使用

validate(); (revalidate in Java7 )
repaint();

• 关于标准规则的示例

  使用CardLayout而不是remove，然后使用add JPanel到容器中

  use CardLayout instead of remove and then add the JPanel to the container

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