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POHow do I get user input from a JTextField?
 

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  1. POHow do I get user input from a JTextField?
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    <p>I am attempting a <em>very</em> simple form designed to take user input into a JTextField and show that same input via a pop up dialog.</p> <p>I can hardcode the JTextField to have a preset number using setText(). If I do this, my program works flawlessly.</p> <p>However, when I leave the field blank and try getText() to show the text in the pop up dialog, I either get an empty pop up frame, or I get an 'empty string' exception (I am attempting to parse String to Double.)</p> <p><pre></p> <code>package buttontest; import java.awt.*; import java.awt.event.ActionListener; import java.awt.event.ComponentEvent; import javax.swing.*; import java.awt.event.ActionEvent; import javax.swing.event.DocumentEvent; import javax.swing.event.DocumentListener; public class ButtonTest { public static void main(String[] args) { ButtonFrame frame = new ButtonFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } } class ButtonFrame extends JFrame { @SuppressWarnings("LeakingThisInConstructor") public ButtonFrame() { setTitle("SunStream Loan Calculator v2.0"); setSize(900,900); ButtonPanel panel = new ButtonPanel(); panel.add(new JLabel("Enter your loan amount:")); loanAmt = new JTextField(40); panel.add(loanAmt); add(panel,BorderLayout.CENTER); } public JTextField loanAmt; class ButtonPanel extends JPanel implements ActionListener { private Component frame; public ButtonPanel() { final JButton b2 = new JButton("Calculate"); add(b2, BorderLayout.SOUTH); b2.setActionCommand("calculate"); b2.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { ButtonFrame bf = new ButtonFrame(); if("calculate".equals(e.getActionCommand())) { JOptionPane.showMessageDialog(frame, bf.loanAmt.getText()); } } }); } @Override public void actionPerformed(ActionEvent ae) { throw new UnsupportedOperationException("Not supported yet."); } } } </code></pre> <p></p> <p>Any help would be greatly appreciated. I am researching using a KeyListener or KeyEvent but I don't quite understand it well enough.</p>
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