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java - 是否可以将初始化部分拆分为不同的类？

问题描述

我一直在从事一些涉及的副项目MySQL，将使用树不同的屏幕：“菜单”、“添加品种”、“浏览品种”。

此时部分initialize变得相当大，我想将它分成 3 个不同的类。

是否可以在课外进行JPanel初始化Window？

public class Window  {

    public static void setBreed()
    {
        for(int i=0; i<16;i++) {
            breedLabels[i].setText(breedInfo[i]);
            breedLabels[i].setBounds(600,100+i*30,300, 100);
            breedLabels[i].setFont(new Font("Verdana", Font.PLAIN, 20));
            viewBreed.add(breedLabels[i]);
        }
    }

    public static void setText()
    {
        for(int i=0; i<16;i++) {
            textLabels[i].setText(text[i]);
            textLabels[i].setBounds(300,100+i*30,300, 100);
            textLabels[i].setFont(new Font("Verdana", Font.PLAIN, 20));
            viewBreed.add(textLabels[i]);
        }
    }


    public static String URL = "jdbc:mysql://localhost:3306/chooseyourpuppy";
    public static String user = "root";
    public static String password = ""; 
    public static String query = "select * from breeds";

    static String [] breedInfo = new String[16];
    static String [] text = new String[16];

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Window window = new Window();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });     

        View.connect(URL, user, password, query);
    }

    public Window() {
        initialize();
    }

    private JFrame frame;
    public JPanel addBreed;
    public static JPanel viewBreed;
    public JPanel menu;
    public static JLabel[] textLabels;
    public static JLabel[] breedLabels;

private  void initialize() {

        final int WIDTH = 1280, HEIGHT = 720;
        frame = new JFrame();
        frame.getContentPane().setBackground(Color.WHITE);
        frame.getContentPane().setLayout(null);

        frame.setBounds(100, 100, WIDTH, HEIGHT);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("MyBREEDS Viewer");
        frame.setResizable(false);
        frame.setVisible(true);

        //header
        JPanel red = new JPanel();
        red.setBounds(400, 0, 888, 80);
        frame.getContentPane().add(red);
        red.setBackground(new Color(204, 0, 0));
        red.setLayout(null);

        JPanel darkGrey = new JPanel();
        darkGrey.setBounds(0, 0, 387, 80);
        frame.getContentPane().add(darkGrey);
        darkGrey.setBackground(new Color(51, 51, 51));
        darkGrey.setLayout(null);

        JLabel txtpnChoose = new JLabel();
        txtpnChoose.setForeground(new Color(240, 240, 240));
        txtpnChoose.setBounds(56, 11, 367, 63);
        txtpnChoose.setFont(new Font("Verdana", Font.BOLD, 46));
        txtpnChoose.setText("Choose your");
        txtpnChoose.setBackground(null);
        darkGrey.add(txtpnChoose);

        JLabel txtpnPuppy = new JLabel();
        txtpnPuppy.setBounds(5, 11, 166, 63);
        txtpnPuppy.setForeground(new Color(240, 240, 240));
        txtpnPuppy.setFont(new Font("Nunito-Bold", Font.BOLD, 46));
        txtpnPuppy.setText("puppy");
        txtpnPuppy.setBackground(null);
        red.add(txtpnPuppy);        

        JLayeredPane layeredPane = new JLayeredPane();
        layeredPane.setBounds(0, 0, WIDTH, HEIGHT);
        frame.getContentPane().add(layeredPane);
        layeredPane.setLayout(new CardLayout(0, 0));

        JButton btnMenu = new JButton("Back to menu");
        btnMenu.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                layeredPane.removeAll();
                layeredPane.add(menu);
                layeredPane.repaint();
                layeredPane.revalidate();
            }
        });
        btnMenu.setForeground(Color.WHITE);
        btnMenu.setBackground(new Color(51, 51, 51));
        btnMenu.setFont(new Font("Verdana", Font.BOLD, 18));
        btnMenu.setBounds(660, 20, 180, 40);
        btnMenu.setBorderPainted(false);
        btnMenu.setFocusPainted(false);
        red.add(btnMenu);

        //menu      
        menu = new JPanel();
        menu.setBackground(Color.WHITE);
        layeredPane.add(menu, "name_410359960271086");
        menu.setLayout(null);

        JButton btnBrowse = new JButton("Browse breeds");
        btnBrowse.setBounds(100, 300, 400, 200);
        btnBrowse.setFont(new Font("Verdana", Font.PLAIN, 40));
        btnBrowse.setBorder(new LineBorder(Color.DARK_GRAY));
        btnBrowse.setBorder(BorderFactory.createStrokeBorder(new BasicStroke(5.0f)));
        btnBrowse.setBackground(Color.WHITE);       
        btnBrowse.setRequestFocusEnabled(false);
        btnBrowse.setVisible(true);
        btnBrowse.setFocusPainted(false);
        btnBrowse.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                layeredPane.removeAll();
                layeredPane.add(viewBreed);
                layeredPane.repaint();
                layeredPane.revalidate();
                setText();
                setBreed();
            }
        });

        btnBrowse.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseEntered(MouseEvent e) {
                btnBrowse.setBackground(new Color(237, 237, 237));
            }
            @Override
            public void mouseExited(MouseEvent e) {
                btnBrowse.setBackground(Color.WHITE);
            }
        });
        menu.add(btnBrowse);

        addBreed = new JPanel();
        layeredPane.add(addBreed, "name_410359942089403");
        addBreed.setVisible(false);
        addBreed.setBackground(Color.WHITE);
        addBreed.setLayout(null);   

        //view breed window
        viewBreed = new JPanel();
        layeredPane.add(viewBreed, "name_410359924014670");
        viewBreed.setLayout(null);
        viewBreed.setVisible(false);
        viewBreed.setBackground(Color.WHITE);

        ImageIcon previous = new ImageIcon("src/images/previous.png");
        ImageIcon previousHover = new ImageIcon("src/images/previousHover.png");

        JButton prevBreed = new JButton(previous);
        prevBreed.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseEntered(MouseEvent e) {
                prevBreed.setIcon(previousHover);
            }
            @Override
            public void mouseExited(MouseEvent e) {
                prevBreed.setIcon(previous);
            }
        });
        prevBreed.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                View.changeBreed(false);
            }
        });
        prevBreed.setBounds(30, 300, previous.getIconHeight(), previous.getIconWidth());
        viewBreed.add(prevBreed);
        prevBreed.setRequestFocusEnabled(false);
        prevBreed.setOpaque(false);
        prevBreed.setContentAreaFilled(false);
        prevBreed.setBorderPainted(false);
        prevBreed.setFocusPainted(false);

        ImageIcon next = new ImageIcon("src/images/next.png");
        ImageIcon nextHover = new ImageIcon("src/images/nextHover.png");

        JButton nextBreed = new JButton(next);
        nextBreed.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseEntered(MouseEvent e) {
                nextBreed.setIcon(nextHover);
            }
            @Override
            public void mouseExited(MouseEvent e) {
                nextBreed.setIcon(next);
            }
        });
        nextBreed.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                View.changeBreed(true);
            }
        });
        nextBreed.setBounds(1140, 300, previous.getIconHeight(), previous.getIconWidth());
        viewBreed.add(nextBreed);
        nextBreed.setRequestFocusEnabled(false);
        nextBreed.setVisible(true);
        nextBreed.setOpaque(false);
        nextBreed.setContentAreaFilled(false);
        nextBreed.setBorderPainted(false);
        nextBreed.setFocusPainted(false);   

        //add breed window
        JButton btnAdd = new JButton("Add new breed");
        btnAdd.setBounds(780, 300, 400, 200);
        btnAdd.setFont(new Font("Verdana", Font.PLAIN, 40));
        btnAdd.setBorder(new LineBorder(Color.DARK_GRAY));
        btnAdd.setBorder(BorderFactory.createStrokeBorder(new BasicStroke(5.0f)));
        btnAdd.setBackground(Color.WHITE);      
        btnAdd.setRequestFocusEnabled(false);
        btnAdd.setFocusPainted(false);
        btnAdd.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                layeredPane.removeAll();
                layeredPane.add(addBreed);
                layeredPane.repaint();
                layeredPane.revalidate();
            }
        });

        btnAdd.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseEntered(MouseEvent e) {
                btnAdd.setBackground(new Color(237, 237, 237));
            }
            @Override
            public void mouseExited(MouseEvent e) {
                btnAdd.setBackground(Color.WHITE);
            }
        });
        menu.add(btnAdd);

        breedLabels = new JLabel[breedInfo.length];

        for(int i=0; i<breedInfo.length; i++) {
            breedLabels[i] = new JLabel(breedInfo[i]);
        }

        textLabels = new JLabel[breedInfo.length];

        for(int i=0; i<breedInfo.length; i++) {
            textLabels[i] = new JLabel(breedInfo[i]);
        }       
    }
}

标签： javaswing

解决方案

是否可以在课外进行初始化JPanel？Window”

是的。一个不同的类可能包含一个创建 & 返回一个JPanel.

其他提示：

  • Java GUI 必须在不同的语言环境中使用不同的 PLAF 在不同的操作系统、屏幕尺寸、屏幕分辨率等上工作。因此，它们不利于像素完美布局。而是使用布局管理器，或它们的组合以及布局填充和空白边框。
  • 应用程序资源在部署时将成为嵌入式资源，因此明智的做法是立即开始访问它们。嵌入式资源必须通过 URL 而不是文件访问。查看信息。嵌入资源的页面，了解如何形成 URL。
  • new Font("Verdana", Font.PLAIN, 20)Font.SERIF除非您的应用程序提供了字体，否则请使用默认字体或逻辑字体 (EG )。作为嵌入式资源。
  • 添加的标签的循环和数组viewBreed表明它应该是 aJList而不是 aJPanel
  • layeredPane.removeAll();.. 呃.. 使用 aCardLayout如this answer所示。
  • 的目的是JLayeredPane什么？我认为这完全是不必要的，因为它们几乎没有用处。

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