java怎么让一个类有gui,将所有java swing gui放在一个类中是正常的吗？

水深无声 2022-08-29 15:46 13阅读 0赞

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I am just starting out with swing development and am having an issue. Is it normal to put the entire GUI into a single class? The application that I am building has one single JFrame that displays multiple different "pages". For example if the user clicks on a button they are taken to an entirely different page with a different layout. I've configured a Card Layout, and the one card that I have build so far uses the GridBag layout.

The question that I have, then, is

1. whether or not each page should have its own class?

2. If they do how do I communicate between the GUI controller which runs the card layout and the individual pages?

3. Or should I just put all of the GUI into the GUI controller and let it run like that.

Below is the code for what I have so far, I am new to this and really would like to get good at it so if you spot any major issues that I missed please feel free to point them out.

Code for the individual page:

public class HomePage extends JPanel implements ActionListener\{

private GridBagLayout gl;

private JPanel frm;

JButton newPersonalContact;

HomePage()\{

frm=new JPanel();

gl=new GridBagLayout();

GridBagConstraints gbc=new GridBagConstraints();

frm.setLayout(gl);

newPersonalContact=new JButton("New Personal Contact");

JButton newBusinessContact=new JButton("New Business Contact");

JButton showAllContacts=new JButton("Show All Contacts");

JButton saveAndQuit=new JButton("Save and Quit");

JPanel top=new JPanel();

top.setBackground(new Color(218,165,32));

top.add(new JLabel("Western Governers University Presents:"));

JPanel middle=new JPanel();

middle.setBackground(new Color(43,37,85));

GridLayout ge=new GridLayout(4,4);

middle.setLayout(ge);

middle.add(new JLabel(""));

middle.add(newPersonalContact);

middle.add(newBusinessContact);

middle.add(new JLabel(""));

middle.add(showAllContacts);

middle.add(saveAndQuit);

middle.add(new JLabel(""));middle.add(new JLabel(""));

middle.add(new JLabel(""));

JPanel bottom=new JPanel();

bottom.setBackground(new Color(218,165,32));

gbc.fill=GridBagConstraints.BOTH;

gbc.weightx=1.0;

gbc.weighty=2.0;

gbc.gridx=0;

gbc.gridy=0;

frm.add(top,gbc);

gbc.weighty=6.0;

gbc.gridx=0;

gbc.gridy=1;

frm.add(middle,gbc);

gbc.weighty=1.0;

gbc.gridx=0;

gbc.gridy=2;

frm.add(bottom,gbc);

newPersonalContact.addActionListener(this);

newBusinessContact.addActionListener(this);

showAllContacts.addActionListener(this);

saveAndQuit.addActionListener(this);

public void actionPerformed(ActionEvent ae)\{

if (ae.getSource()==newPersonalContact)\{

//What goes here?

public JPanel getFrame()\{

return frm;

code for the GUI controller:

public class GUIController \{

JFrame frm;

CardLayout cl;

Container pane;

GUIController()\{

frm=new JFrame();

frm.setSize(800,600);

frm.setDefaultCloseOperation(JFrame.EXIT\_ON\_CLOSE);

JPanel card2=new JPanel();

card2.setBackground(Color.black);

JPanel cards=new JPanel(new CardLayout());

cards.add(new HomePage().getFrame(), "Home");

cards.add(card2,"New Personal Contact");

pane=frm.getContentPane();

pane.add(cards,BorderLayout.CENTER);

public void start()\{

this.frm.setVisible(true);

public void showCard()\{

cl.show(pane, "Card2");

While this is for a school Project, the GUI interface is not required just something I am interested in learning. Thanks for any help.

解决方案

No, I don't recommend to put all GUI code in class - at least if it gets big and does several things.

In that case use the Mediator pattern:

put subcomponents to custom subclasses of JPanel

that subclass listens for events of its children and updates other children

fires own custom events if needed

Also note: If you're about to learn GUI programming and don't have a specific requirement to use Swing, consider to use the newer GUI toolkit JavaFX.

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java怎么让一个类有gui,将所有java swing gui放在一个类中是正常的吗？

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