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POtrouble obtaining variable info from another JFrame
 

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    <p>I am trying to create something similar to a JOptionPane but will obtain more than one(3) variables from input. So I figured I would use a separate JFrame that had three textFields. I used access methods like Get and Set to get the variables from one class to another, but I am getting a null pointer excpetion. I figure I am going about getting the variables the wrong way, and am having a hard time trying to find a viable solution. </p> <pre><code>public class Instructor() { public void Insert(JPanel panel) { panel.removeAll(); panel.updateUI(); //ResultSet resultSet = null; String bNum = ""; String fName = ""; String lName = ""; InsertFrame insert = new InsertFrame(); insert.setVisible(true); bNum = insert.getBNumber(); fName = insert.getFirstName(); lName = insert.getLastName(); /* String bNum = JOptionPane.showInputDialog("Enter BNumber"); String fName = JOptionPane.showInputDialog("Enter First Name"); String lName = JOptionPane.showInputDialog("Enter Last Name");*/ try { connection = DriverManager.getConnection(URL); insertNewInstructor = connection.prepareStatement( "INSERT INTO Instructor" + "(BNumber, FirstName, LastName)" + "VALUES (?,?,?)"); }catch(SQLException sqlException){ sqlException.printStackTrace(); System.exit(1); }//end catch try { insertNewInstructor.setString(1, bNum); insertNewInstructor.setString(2, fName); insertNewInstructor.setString(3, lName); insertNewInstructor.executeUpdate(); }catch(SQLException sqlException){ sqlException.printStackTrace(); }//end of catch finally { close(); }//end Display(panel); }//end of insert method }//end of class Instructor class InsertFrame extends JFrame implements ActionListener { private JTextField bNumber; private JLabel bNum; private JTextField firstName; private JLabel fName; private JTextField lastName; private JLabel lName; private JButton ok; private JPanel fieldPanel; private JPanel buttonPanel; private String bNumr = ""; private String frName = ""; private String lsName = ""; public InsertFrame() { bNumber = new JTextField(10); bNum = new JLabel(); firstName = new JTextField(10); fName = new JLabel(); lastName = new JTextField(10); lName = new JLabel(); fieldPanel = new JPanel(); fieldPanel.setLayout(new GridLayout(3,2,4,4)); bNum.setText("B-Number:"); fieldPanel.add(bNum); fieldPanel.add(bNumber); fName.setText("First Name:"); fieldPanel.add(fName); fieldPanel.add(firstName); lName.setText("Last Name:"); fieldPanel.add(lName); fieldPanel.add(lastName); ok = new JButton("Ok"); ok.addActionListener(this); this.add(fieldPanel, BorderLayout.CENTER); this.add(buttonPanel,BorderLayout.SOUTH); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setSize(310,300); this.setResizable(false); this.setVisible(false); }//end of constructor public void actionPerformed(ActionEvent e) { bNumr = bNumber.getText(); frName = firstName.getText(); lsName = lastName.getText(); }//end of method actionPerformed public void setBNumber(String number) { bNumr = number; }//end of setBNumber public String getBNumber() { return bNumr; }//end of getBNumber method public void setFirstName(String firstN) { frName = firstN; }//end of setFirstName public String getFirstName() { return frName; }//end of getFirstName method public void setLastName(String lastN) { lsName = lastN; }//end of setLastName method public String getLastName() { return lsName; }//end of getLastName method }//end of InsertFrame </code></pre>
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    1. COWhy not still use a JOptionPane, but just give it 3 JTextFields? Please look at [this](http://stackoverflow.com/a/9952457/522444) for example.
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