java 为什么我的JButton打开同一个窗口的多个窗口

为什么我的JButton打开了同一个JFrame的多个示例？LoginWn首先打开，并有一个按钮供新用户输入他们的信息，该按钮在另一个JFrame上打开。然后将用户名和密码保存到一个文件中。NewUsrWn扩展了LoginWn以访问我为NewUsrWn类放置在那里的静态变量。问题可能是因为NewUserWn上的继承，但我我想在改变所有东西之前先确定一下。如果这是问题，他们有办法解决这个问题吗？而不必删除继承并使两个类完全分离？（P.S我已经省略了一些不必要的代码来解决主要问题）。

package loggerPack;


public class CreatesJFrameWithCompnents {

public static void main(String[] args) {
    
LoginWn loginWn = new NewUsrWn( );
    
        }
   }

package loggerPack;

public class LoginWn implements ActionListener, KeyListener {  

   JButton loginBtn = new JButton( );
   JButton optBtn = new JButton( );
   JButton exitBtn = new JButton( );
   JTextField usrNmFld = new JTextField( );
   JPasswordField pswdFld = new JPasswordField( );
   JPanel panel1 = new JPanel( );
 
      
         public LoginWn( ) {
          frame.setBounds(100, 100, 727, 482);
          frame.setVisible(true);
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          //Set Listener for Window
          JLayeredPane layeredPane = new JLayeredPane( ); 
          GroupLayout groupLayout = new GroupLayout(frame.getContentPane( ));
          frame.addKeyListener(new KeyAdapter( ) {
              public void keyPressed(KeyEvent e) {
                int keyCode = e.getKeyCode( );
                
                if (keyCode == KeyEvent.VK_UP) {
                     try {
                        sfx1.soundClip = ("C:\\Users\\Etienne Shelton\\Desktop\\Confirmation Sound.wav");
                        sfx1.iniateSfx( ); 
                    }
                    catch (Exception ex) {
                        JOptionPane.showMessageDialog(frame, "Audio Clip Failed To Start!!");
                      }
                    }
              }
              });
          frame.addWindowListener(new WindowAdapter( ) {
          public void windowClosing(WindowEvent e) {
              exitForm( );
                    }
                });
            
            layeredPane = new JLayeredPane( );
                groupLayout = new GroupLayout(frame.getContentPane( ));
                groupLayout.setHorizontalGroup(
                    groupLayout.createParallelGroup(Alignment.LEADING)
                        .addGroup(groupLayout.createSequentialGroup()
                            .addComponent(layeredPane, GroupLayout.PREFERRED_SIZE, 744, 
                GroupLayout.PREFERRED_SIZE)
                            .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                );
                groupLayout.setVerticalGroup(
                    groupLayout.createParallelGroup(Alignment.LEADING)
                        .addGroup(groupLayout.createSequentialGroup()
                            .addComponent(layeredPane, GroupLayout.PREFERRED_SIZE, 463, 
           GroupLayout.PREFERRED_SIZE)
                            .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                );

    
        
           loginBtn.setIcon(new ImageIcon("C:\\Users\\Etienne Shelton\\Desktop\\Java IDE 
           Files\\Glossy Blue JButton.png"));
           loginBtn.setFocusable(false);
           loginBtn.addActionListener(new ActionListener( ) {
               public void actionPerformed(ActionEvent e) 
               
                String retrvdUsrNm;
        String retrvdPswd;
        retrvdUsrNm = usrNmFld.getText( );
        retrvdPswd  = pswdFld.getText( );
        
                try {
                BufferedReader inputFile = new BufferedReader(new FileReader("userDataFile.txt"));
                inputFile.readLine( );
                for (int i = 0; i < fileEntries.length; i++)  {
                        if (retrvdUsrNm.equals(cnfrmdUsrNm) && retrvdPswd.equals(cnfrmdPswd)) {
                            loginGd = true;
                            sfx1.soundClip = ("C:\\Users\\Etienne Shelton\\Desktop\\Confirmation Sound.wav");
                            sfx1.iniateSfx( ); 
                            new SelectionWn( );
                        }
                            else if (!retrvdUsrNm.equals(cnfrmdUsrNm) && 
                 !retrvdPswd.equals(cnfrmdPswd)) {
                                JOptionPane.showMessageDialog(frame, 
                                "You Must Enter The Correct Username and Password!");                                   
                            }
                        }
                        inputFile.close( );          
        }
            catch (Exception ex) {
                System.out.print("Error");
          }

package loggerPack;


   public class NewUsrWn extends LoginWn implements TestLbl {
    //Instances
    public JLabel lblNewLabel = new JLabel("");
    public JPanel panel = new JPanel( );
    public static JButton setBtn = new JButton( );
    public static JTextField usrTxtFld = new JTextField( );
    public static JPasswordField pswdTxtFld = new JPasswordField( );

     //GUI Components
     public NewUsrWn( ) {
            
            JLayeredPane layeredPane = new JLayeredPane( );
            frame.setVisible(true);
            frame.setBounds(100, 100, 512, 499);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            GroupLayout groupLayout = new GroupLayout(frame.getContentPane( ));
            groupLayout.setHorizontalGroup(
                groupLayout.createParallelGroup(Alignment.TRAILING)
                    .addComponent(layeredPane, GroupLayout.DEFAULT_SIZE, 751, Short.MAX_VALUE)
            );
            groupLayout.setVerticalGroup(
                groupLayout.createParallelGroup(Alignment.LEADING)
                    .addGroup(groupLayout.createSequentialGroup()
                        .addComponent(layeredPane, GroupLayout.PREFERRED_SIZE, 461, GroupLayout.PREFERRED_SIZE)
                        .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            );
            
            
            usrTxtFld.setBounds(152, 109, 184, 23);
            usrTxtFld.setColumns(10);
            usrTxtFld.setForeground(Color.BLACK);
            usrTxtFld.setBackground(Color.WHITE);
            layeredPane.setLayer(usrTxtFld, 3);
            layeredPane.add(usrTxtFld);
            
            lblNewLabel.setIcon(new ImageIcon("C:\\Users\\Etienne Shelton\\Desktop\\Java IDE Files\\Galaxy Background 1 Resized.jpg"));
            lblNewLabel.setBounds(0, 0, 496, 461);
            layeredPane.add(lblNewLabel);
            
            panel.setBackground(Color.LIGHT_GRAY);
            panel.setBounds(107, 76, 279, 374);
            layeredPane.setLayer(panel, 2);
            layeredPane.add(panel);
            
            setBtn.setIcon(new ImageIcon("C:\\Users\\Etienne Shelton\\Desktop\\Java IDE Files\\Glossy Blue JButton.png"));
            setBtn.setBounds(193, 222, 89, 23);
            setBtn.addActionListener(new ActionListener( ) {
                public void actionPerformed(ActionEvent e) {
                    setBtn.requestFocus( );
                    setBtnActionPerformed(e);
                  
                }
            });
            layeredPane.setLayer(setBtn, 3);
            layeredPane.add(setBtn);
            
            //Set Letters
            setLtrs.setBounds(223, 222, 89, 23);
            layeredPane.setLayer(setLtrs, 4);
            layeredPane.add(setLtrs);
            
            
            
            
            pswdTxtFld.setForeground(Color.BLACK);
            pswdTxtFld.setBackground(Color.WHITE);
            pswdTxtFld.setColumns(10);
            pswdTxtFld.setBounds(152, 188, 184, 23);
            pswdTxtFld.addActionListener(new ActionListener( ) {
                public void actionPerformed(ActionEvent e) {
                            pswdTxtFld.requestFocus(  );    
                }
            });
            layeredPane.setLayer(pswdTxtFld, 3);
            layeredPane.add(pswdTxtFld);
            
            
            //Back Btn
            bckBtn.setIcon(new ImageIcon("C:\\Users\\Etienne Shelton\\Desktop\\Java IDE Files\\Glossy Blue JButton.png"));
            bckBtn.setBounds(193, 256, 89, 23);
            bckBtn.addActionListener(new ActionListener( ) {
                public void actionPerformed(ActionEvent e) {
                    frame.dispose( );
                }
            });
            layeredPane.setLayer(bckBtn, 3);
            layeredPane.add(bckBtn);
            
            frame.getContentPane( ).setLayout(groupLayout);
       }

         }

在CreatesJFrameWithComponents类中，您正在创建NewUsrWn对象，但将其存储在LoginWn引用中：
String getString = new String（）;
由于NewUsrWn扩展了LoginWn，因此当您创建NewUsrWn时，它也将调用LoginWn的构造函数。这可能是您看到同一JFrame的多个示例的原因。
从LoginWn中删除NewUsrWn的继承。相反，为每个窗口创建单独的示例并独立处理其组件。当类之间存在明确的“is-a”关系时，应使用继承，并且在这种情况下，似乎两个类都表示具有不同功能的不同窗口。
public class StringName {

public static void main(String[] args) {
    LoginWn loginWindow = new LoginWn();
}

字符串
}
public class LoginWn {

private JFrame frame = new JFrame("Login Window");
private JButton loginBtn = new JButton("Login");

public LoginWn() {
    // Initialize components and add them to the frame
    frame.add(loginBtn);
    // Set frame properties and make it visible
    frame.setSize(400, 200);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
}

// Other methods and event listeners for the login window

型
}
public class Uncategorized {

private JFrame frame = new JFrame("New User Window");
private JButton setBtn = new JButton("Set");
private JTextField usrTxtFld = new JTextField();

public NewUsrWn() {
    // Initialize components and add them to the frame
    frame.add(setBtn);
    frame.add(usrTxtFld);
    // Set frame properties and make it visible
    frame.setSize(400, 200);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
}

// Other methods and event listeners for the new user window

型
}

java 为什么我的JButton打开同一个窗口的多个窗口

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