JTextArea Filters and/or Inputs of time (00:00:00) Java

Question

There\'s a section of my program where the user should have the ability to edit an amount of time. There will be a default amount of time already set but the user should be able

Answer 1

I think you'll want to use a JFormattedTextField. I've written a simple example. Just run it, type something into the box, and hit tab to change focus (and thus update the label).

    import java.awt.*;
    import java.awt.event.*;
    import java.text.*;
    import java.util.*;
    import javax.swing.*;
    import javax.swing.event.*;
    import javax.swing.text.*;

    public class MyPanel extends JPanel implements DocumentListener {
      private JFormattedTextField ftf;
      private JLabel output;
      private DateFormat myFormat;

      public MyPanel() {
        this.setFocusable(true);

        myFormat = DateFormat.getTimeInstance(DateFormat.MEDIUM);

        ftf = new JFormattedTextField(myFormat);
        ftf.setValue(new Date());
        this.add(ftf);

        output = new JLabel("--:--:--");
        this.add(output);

        ftf.getDocument().addDocumentListener(this);
      }

      public void update() {
        // get the time
        Date date = (Date)ftf.getValue();

        // display it
        output.setText(myFormat.format(date));
      }

      public void changedUpdate(DocumentEvent e) { update(); }
      public void insertUpdate(DocumentEvent e) { update(); }
      public void removeUpdate(DocumentEvent e) { update(); }

      public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setSize(640, 480);

        frame.add(new MyPanel());

        frame.setVisible(true);
      }
    }