将主类和主类中的其他函数分离到单独的类文件中

Question

我只有一个'mainclass'类，在这个类中已经编写了其他函数，因为现在代码越来越多，我很难做任何更改。所以我想把一个mainclass分开，把不同类中的其他函数分开，并在mainclass中调用它们，这样任何更改/更新，我都只能更改将反映在mainclass上的子类。自从我是新手！请告诉我如何划分为子类，并在主类中调用这些子类。

public class mainClass extends JFrame{
    private JFrame frmScms;
    private JTabbedPane tabbedPane;
    private JPanel panel1;
    private JPanel panel2;
    private JPanel panel3;
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    mainClass window = new mainClass();
                    window.frmScms.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
    public mainClass() {
        initialize();
    }
    private void initialize() {
        frmScms = new JFrame();
        frmScms.setTitle("SCMS");
        frmScms.setBounds(100, 100, 1080, 684);
        frmScms.setExtendedState(MAXIMIZED_BOTH);
        frmScms.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frmScms.getContentPane().setLayout(null);
        frmScms.setResizable(true);
        //Set the frame icon to an image loaded from a file.
        frmScms.setIconImage(new ImageIcon("images/company-logo.gif").getImage());
        //creating pages
        createPageScreen1();
        createPageScreen2();
        createPageScreen3();
        tabbedPane = new JTabbedPane(JTabbedPane.TOP);
        tabbedPane.setBounds(2, 20, 1900, 1080);
        //tool tip for screen-1 to 6
        String tooltip1 = "Screen-1";
        String tooltip2 = "Screen-2";
        String tooltip3 = "Screen-3";

        // Create a tabbed pane
        tabbedPane.addTab("Screen-1", null, panel1, tooltip1);
        tabbedPane.addTab("Screen-2", null, panel2, tooltip2);
        tabbedPane.addTab("Screen-3", null, panel3, tooltip3);
        frmScms.getContentPane().add(tabbedPane);
        //warning message before close using X 
        frmScms.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        frmScms.addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                JFrame frame = (JFrame)e.getSource();
                int result = JOptionPane.showConfirmDialog(frame, "Are you sure you want to close the application?", "Please Confirm",JOptionPane.YES_NO_OPTION);
                if (result == JOptionPane.YES_OPTION)
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            }
        });
    }
    //function for panel - page - 1
    public void createPageScreen1() {
        panel1 = new JPanel();
        panel1.setLayout( new BorderLayout() );

        ImageIcon image = new ImageIcon("images/Front1.png");
        JLabel label2 = new JLabel(image, JLabel.CENTER);
        label2.setBounds( 10, 55, 1600, 900 );
        panel1.add(label2);
    }
    //function for panel - page - 2
    public void createPageScreen2() {
        panel2 = new JPanel();
        panel2.setLayout( null );
        JLabel label1 = new JLabel( "LOG:" );
        label1.setBounds( 10, 15, 150, 20 );
        panel2.add( label1 );
        JLabel label2 = new JLabel( "Well 1 PMW Pressure Sensor - Tag xx123" );
        label2.setBounds( 10, 45, 300, 20 );
        panel2.add( label2 );
    }
    //function for panel - page - 3
    public void createPageScreen3() {
        panel3 = new JPanel();
        panel3.setLayout( null );
        JLabel label1 = new JLabel( "GENERAL SETTINGS:" );
        label1.setBounds( 10, 15, 150, 20 );
        panel3.add( label1 );
        JLabel label2 = new JLabel( "Tag Name:" );
        label2.setBounds( 10, 45, 300, 20 );
        panel3.add( label2 );
        JTextField jtext1 = new JTextField( "Tag xx123" );
        jtext1.setBounds(95, 45, 100, 20);
        panel3.add( jtext1 );
        JLabel label3 = new JLabel( "Description:" );
        label3.setBounds( 10, 65, 300, 20 );
        panel3.add( label3 );
        JTextField jtext2 = new JTextField( "Tag1" );
        jtext2.setBounds(95, 65, 100, 20);
        panel3.add( jtext2 );
    }
}

1. Main类应该调用JTabbedPane（作为单独的）类
2. JTabbedPane类应该调用createPageScreen1（作为单独的）类
3. JTabbedPane类应该调用createPageScreen2（作为单独的）类
4. JTabbedPane类应该调用createPageScreen3（作为单独的）类

请给我指路，谢谢！

Answer 1

您只需要通过扩展某些Swing组件的自定义类来封装创建面板的方法，例如JPanel:

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import static java.awt.Frame.MAXIMIZED_BOTH;
public class MainClass extends JFrame{
    private JFrame frmScms;
    private JTabbedPane tabbedPane;
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    MainClass window = new MainClass();
                    window.frmScms.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
    public MainClass() {
        initialize();
    }
    private void initialize() {
        frmScms = new JFrame();
        frmScms.setTitle("SCMS");
        frmScms.setBounds(100, 100, 1080, 684);
        frmScms.setExtendedState(MAXIMIZED_BOTH);
        frmScms.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frmScms.getContentPane().setLayout(null);
        frmScms.setResizable(true);
        //Set the frame icon to an image loaded from a file.
        frmScms.setIconImage(new ImageIcon("images/company-logo.gif").getImage());
        tabbedPane = new JTabbedPane(JTabbedPane.TOP);
        tabbedPane.setBounds(2, 20, 1900, 1080);
        //tool tip for screen-1 to 6
        String tooltip1 = "Screen-1";
        String tooltip2 = "Screen-2";
        String tooltip3 = "Screen-3";

        // Create a tabbed pane
        tabbedPane.addTab("Screen-1", null, new PageScreen1(), tooltip1);
        tabbedPane.addTab("Screen-2", null, new PageScreen2(), tooltip2);
        tabbedPane.addTab("Screen-3", null, new PageScreen3(), tooltip3);
        frmScms.getContentPane().add(tabbedPane);
        //warning message before close using X 
        frmScms.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        frmScms.addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                JFrame frame = (JFrame)e.getSource();
                int result = JOptionPane.showConfirmDialog(frame, "Are you sure you want to close the application?", "Please Confirm",JOptionPane.YES_NO_OPTION);
                if (result == JOptionPane.YES_OPTION)
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            }
        });
    }
}

---

class PageScreen1 extends JPanel {
    private PageScreen1() {
        setLayout( new BorderLayout() );
        ImageIcon image = new ImageIcon("images/Front1.png");
        JLabel label2 = new JLabel(image, JLabel.CENTER);
        label2.setBounds( 10, 55, 1600, 900 );
        add(label2);
    }
}

---

class PageScreen2 extends JPanel {
    private PageScreen2() {
        setLayout( null );
        JLabel label1 = new JLabel( "LOG:" );
        label1.setBounds( 10, 15, 150, 20 );
        add( label1 );
        JLabel label2 = new JLabel( "Well 1 PMW Pressure Sensor - Tag xx123" );
        label2.setBounds( 10, 45, 300, 20 );
        add( label2 );
    }
}

---

class PageScreen3 extends JPanel {
    private PageScreen3() {
        setLayout( null );
        JLabel label1 = new JLabel( "GENERAL SETTINGS:" );
        label1.setBounds( 10, 15, 150, 20 );
        add( label1 );
        JLabel label2 = new JLabel( "Tag Name:" );
        label2.setBounds( 10, 45, 300, 20 );
        add( label2 );
        JTextField jtext1 = new JTextField( "Tag xx123" );
        jtext1.setBounds(95, 45, 100, 20);
        add( jtext1 );
        JLabel label3 = new JLabel( "Description:" );
        label3.setBounds( 10, 65, 300, 20 );
        add( label3 );
        JTextField jtext2 = new JTextField( "Tag1" );
        jtext2.setBounds(95, 65, 100, 20);
        add( jtext2 );   
    }
}

Answer 2

这里有一种将代码分解为类的方法。将创建JTabbedPane的每个JPanel的代码移动到其自己的类中。

主要类别：

package com.ggl.split;
import java.awt.EventQueue;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
public class MainClass {
    private JFrame frmScms;
    private JTabbedPane tabbedPane;
    private JPanel panel1;
    private JPanel panel2;
    private JPanel panel3;
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    MainClass window = new MainClass();
                    window.frmScms.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
    public MainClass() {
        initialize();
    }
    private void initialize() {
        frmScms = new JFrame();
        frmScms.setTitle("SCMS");
        frmScms.setBounds(100, 100, 1080, 684);
        frmScms.setExtendedState(JFrame.MAXIMIZED_BOTH);
        frmScms.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frmScms.getContentPane().setLayout(null);
        frmScms.setResizable(true);
        // Set the frame icon to an image loaded from a file.
        frmScms.setIconImage(new ImageIcon("images/company-logo.gif")
                .getImage());
        // creating pages
        panel1 = new Page1().getPanel1();
        panel2 = new Page2().getPanel2();
        panel3 = new Page3().getPanel3();
        tabbedPane = new JTabbedPane(JTabbedPane.TOP);
        tabbedPane.setBounds(2, 20, 1900, 1080);
        // tool tip for screen-1 to 6
        String tooltip1 = "Screen-1";
        String tooltip2 = "Screen-2";
        String tooltip3 = "Screen-3";
        // Create a tabbed pane
        tabbedPane.addTab("Screen-1", null, panel1, tooltip1);
        tabbedPane.addTab("Screen-2", null, panel2, tooltip2);
        tabbedPane.addTab("Screen-3", null, panel3, tooltip3);
        frmScms.getContentPane().add(tabbedPane);
        // warning message before close using X
        frmScms.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        frmScms.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                JFrame frame = (JFrame) e.getSource();
                int result = JOptionPane.showConfirmDialog(frame,
                        "Are you sure you want to close the application?",
                        "Please Confirm", JOptionPane.YES_NO_OPTION);
                if (result == JOptionPane.YES_OPTION)
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            }
        });
    }
}

Page1类：

package com.ggl.split;
import java.awt.BorderLayout;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Page1 {
    private JPanel panel1;
    public Page1() {
        createPageScreen1();
    }
    // function for panel - page - 1
    private void createPageScreen1() {
        panel1 = new JPanel();
        panel1.setLayout(new BorderLayout());
        ImageIcon image = new ImageIcon("images/Front1.png");
        JLabel label2 = new JLabel(image, JLabel.CENTER);
        label2.setBounds(10, 55, 1600, 900);
        panel1.add(label2);
    }
    public JPanel getPanel1() {
        return panel1;
    }
}

Page2类：

package com.ggl.split;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Page2 {
    private JPanel panel2;
    public Page2() {
        createPageScreen2();
    }
    // function for panel - page - 2
    private void createPageScreen2() {
        panel2 = new JPanel();
        panel2.setLayout(null);
        JLabel label1 = new JLabel("LOG:");
        label1.setBounds(10, 15, 150, 20);
        panel2.add(label1);
        JLabel label2 = new JLabel("Well 1 PMW Pressure Sensor - Tag xx123");
        label2.setBounds(10, 45, 300, 20);
        panel2.add(label2);
    }
    public JPanel getPanel2() {
        return panel2;
    }
}

Page3类：

package com.ggl.split;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Page3 {
    private JPanel panel3;
    public Page3() {
        createPageScreen3();
    }
    // function for panel - page - 3
    private void createPageScreen3() {
        panel3 = new JPanel();
        panel3.setLayout(null);
        JLabel label1 = new JLabel("GENERAL SETTINGS:");
        label1.setBounds(10, 15, 150, 20);
        panel3.add(label1);
        JLabel label2 = new JLabel("Tag Name:");
        label2.setBounds(10, 45, 300, 20);
        panel3.add(label2);
        JTextField jtext1 = new JTextField("Tag xx123");
        jtext1.setBounds(95, 45, 100, 20);
        panel3.add(jtext1);
        JLabel label3 = new JLabel("Description:");
        label3.setBounds(10, 65, 300, 20);
        panel3.add(label3);
        JTextField jtext2 = new JTextField("Tag1");
        jtext2.setBounds(95, 65, 100, 20);
        panel3.add(jtext2);
    }
    public JPanel getPanel3() {
        return panel3;
    }
}