Question

要求是我有2个面板，即。 Panel1，Panel2。 Panel1将有2个按钮，当我点击任何按钮时，Panel应该动态显示Panel1上该按钮特有的组件。

public class ListenerForRadioButton implements ActionListener{

JButton browseGlobal;
JFrame ParentFrame = new JFrame("Bla-Bla");
JPanel ChildPanel2 = new JPanel();
JButton upload ;

public ListenerForRadioButton(JFrame JFrameConstructor, JPanel JPanelConstructor, JButton uploadConstructor ){
    this.ParentFrame = JFrameConstructor;
    this.ChildPanel2 = JPanelConstructor;
    this.upload = uploadConstructor;
}

public void actionPerformed(ActionEvent event){

    //ChildPanel2.remove(upload);
    ChildPanel2.remove(upload);
    System.out.println("My listener is called");

} //方法结束 } //类的结尾

公共类Create_JFrame扩展了JFrame {

public Create_JFrame(){

     //Create a Frame
     JFrame ParentFrame = new JFrame("Bla-Bla");
     JPanel ChildPanel1 = new JPanel();
     JPanel ChildPanel2 = new JPanel();
     JButton Option1 = new JButton("Option1");
     JButton browse = new JButton("Browse");
     JButton upload = new JButton("Upload");

     //Layout management
     ParentFrame.getContentPane().add(BorderLayout.WEST, ChildPanel1);
     ParentFrame.getContentPane().add(BorderLayout.EAST, ChildPanel2);


     //Create a button
     browse.addActionListener(new ListenerForRadioButton(ParentFrame,ChildPanel2,upload)); //Registering my listener

     ChildPanel2.add(browse);
     ChildPanel2.add(upload);
     ChildPanel1.add(Option1);


     //Make the frame visible
     ParentFrame.setSize(500, 300);
     ParentFrame.setVisible(true);
    }//end of Main
}//end of Class

Answer 1

使用removeAll()，您可以从Container删除所有组件。

ChildPanel2.removeAll();
ChildPanel2.revalidate();
ChildPanel2.repaint();

Answer 2

获取组件并将其删除

Component[] components = ChildPanel2.getComponents();

for (Component component : components) {
    ChildPanel2.remove(component);  
}

ChildPanel2.revalidate();
ChildPanel2.repaint();

注意：如果您不想删除所有组件，只需在remove之前插入一个条件，检查组件是否适合死亡。

来源： 1，2，3。

如何动态删除JPanel中的所有组件

2 个答案: