问一个与JFrame和JDialog的有关问题

import java.awt.*; import javax.swing.*; import java.awt.Rectangle; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class Frame1     extends JFrame {   JPanel contentPane;   JButton jButton1 = new JButton();   JButton jButton2 = new JButton();   JButton jButton3 = new JButton();   JButton jButton4 = new JButton();   public Frame1() {     try {       setDefaultCloseOperation(EXIT_ON_CLOSE);       jbInit();     }     catch (Exception exception) {       exception.printStackTrace();     }   }   /**   * Component initialization.   *   * @throws java.lang.Exception   */   private void jbInit() throws Exception {     contentPane = (JPanel) getContentPane();     contentPane.setLayout(null);     setSize(new Dimension(400, 300));     setTitle("Frame Title");     jButton1.setBounds(new Rectangle(37, 44, 120, 28));     jButton1.setText("学校信息录入");     jButton1.addActionListener(new Frame1_jButton1_actionAdapter(this));     jButton2.setBounds(new Rectangle(40, 84, 117, 29));     jButton2.setText("学生信息录入");     jButton3.setBounds(new Rectangle(41, 127, 115, 29));     jButton3.setText("学校设备录入");     jButton4.setBounds(new Rectangle(40, 178, 118, 32));     jButton4.setText("操作人员录入");     contentPane.add(jButton1);     contentPane.add(jButton2);     contentPane.add(jButton3);     contentPane.add(jButton4);   }   public void jButton1_actionPerformed(ActionEvent e) { Dialog1 dlg1=new Dialog1();         dlg1.setVisible(true);   } } class Frame1_jButton1_actionAdapter     implements ActionListener {   private Frame1 adaptee;   Frame1_jButton1_actionAdapter(Frame1 adaptee) {     this.adaptee = adaptee;   }   public void actionPerformed(ActionEvent e) {     adaptee.jButton1_actionPerformed(e);   } } 这是jdialog import java.awt.*; import javax.swing.*; import java.awt.Rectangle; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.*; public class Dialog1     extends JDialog {   JPanel panel1 = new JPanel();   JTextField jTextField1 = new JTextField();   JLabel jLabel1 = new JLabel();   JLabel jLabel2 = new JLabel();   JComboBox jComboBox1 = new JComboBox();   JLabel jLabel3 = new JLabel();   JTextField jTextField2 = new JTextField();   JLabel jLabel4 = new JLabel();   JTextField jTextField3 = new JTextField();   JLabel jLabel5 = new JLabel();   JTextField jTextField4 = new JTextField();   JButton jButton1 = new JButton();   JButton jButton2 = new JButton();   private String driverstr="sun.jdbc.odbc.JdbcOdbcDriver"; private String connStr="jdbc:odbc:test",url="jdbc:odbc:DRIVER=Microsoft Access Driver (*.mdb);DBQ= C:\\Documents and Settings\\test.mdb"; private Connection conn; private PreparedStatement  pstmt; private ResultSet rs;   public Dialog1(Frame owner, String title, boolean modal) {     super(owner, title, modal);     try {       setDefaultCloseOperation(DISPOSE_ON_CLOSE);       jbInit();       pack();     }     catch (Exception exception) {       exception.printStackTrace();     }   }   public Dialog1() {     this(new Frame(), "Dialog1", false);   }   private void jbInit() throws Exception {     panel1.setLayout(null);     this.getContentPane().setLayout(null);     jTextField1.setBounds(new Rectangle(127, 41, 226, 20));     jLabel1.setText("学校名称");     jLabel1.setBounds(new Rectangle(41, 41, 82, 20));     jLabel2.setText("学校所在区");     jLabel2.setBounds(new Rectangle(41, 92, 70, 23));     jComboBox1.setBounds(new Rectangle(127, 92, 128, 23));     jComboBox1.addItem("a");         jLabel3.setText("学校地址");     jLabel3.setBounds(new Rectangle(41, 132, 72, 17));     jTextField2.setBounds(new Rectangle(127, 129, 224, 20));     jLabel4.setText("学校联系电话");     jLabel4.setBounds(new Rectangle(41, 174, 78, 15));     jTextField3.setBounds(new Rectangle(127, 173, 224, 20));     jLabel5.setText("学校校长");     jLabel5.setBounds(new Rectangle(42, 204, 70, 20));     jTextField4.setBounds(new Rectangle(127, 204, 163, 20));     jButton1.setBounds(new Rectangle(41, 248, 81, 23));     jButton1.setText("保存");     jButton1.addActionListener(new Dialog1_jButton1_actionAdapter(this));     jButton2.setBounds(new Rectangle(225, 248, 81, 23));     jButton2.setText("重置");     this.getContentPane().add(panel1, null);     panel1.add(jLabel1);     panel1.add(jTextField1);     panel1.add(jLabel2);     panel1.add(jComboBox1);     panel1.add(jLabel3);     panel1.add(jTextField2);     panel1.add(jLabel4);     panel1.add(jTextField3);     panel1.add(jLabel5);     panel1.add(jTextField4);     panel1.add(jButton1);     panel1.add(jButton2);     panel1.setBounds(new Rectangle(0, 0, 400, 300));     this.pack(); //pack根据容器内的组件以最优的方式调整容器的大小    this.setVisible(true);//setVisible显示当前窗口  }   public void jButton1_actionPerformed(ActionEvent e)   {     try{       Class.forName(driverstr);     }     catch(ClassNotFoundException ex)     {       System.out.println(ex.getMessage());     }     try {       String sql1="insert into schoolinfo values(?,?,?,?,?)";           String s1=jTextField1.getText().trim().toString();           String s2=(String)jComboBox1.getSelectedItem().toString();           String s3=jTextField2.getText().trim().toString();           String s4=jTextField3.getText().trim().toString();             String s5=jTextField4.getText().trim().toString();       conn = DriverManager.getConnection(url);       pstmt=conn.prepareStatement(sql1);       this.pstmt.setString(1,s1);       this.pstmt.setString(2,s2);       this.pstmt.setString(3,s3);       this.pstmt.setString(4,s4);       this.pstmt.setString(5,s5);       this.pstmt.executeUpdate();       new JOptionPane().showMessageDialog(null,"启动");     // System.out.println("11");     }     catch (SQLException ex1) {     }   } } class Dialog1_jButton1_actionAdapter     implements ActionListener {   private Dialog1 adaptee;   Dialog1_jButton1_actionAdapter(Dialog1 adaptee) {     this.adaptee = adaptee;   }   public void actionPerformed(ActionEvent e) {     adaptee.jButton1_actionPerformed(e);   } }