you could use a JFormattedTextField have a look at the example below, this will create a JFormattedTextField which will accept only numbers and put them in the form XXhXXminXXs then add a ActionListener to the JFormattedTextField and in that attempt to parse to a valid time object when ENTER for now I only show the … Read more
You could create your own: import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.FocusEvent; import java.awt.event.FocusListener; import javax.swing.*; public class Main { public static void main(String[] args) { final JFrame frame = new JFrame(); frame.setLayout(new BorderLayout()); final JTextField textFieldA = new HintTextField(“A hint here”); final JTextField textFieldB = new HintTextField(“Another hint here”); frame.add(textFieldA, BorderLayout.NORTH); frame.add(textFieldB, BorderLayout.CENTER); … Read more
Add a DocumentFilter to the (Plain)Document used in the JTextField to avoid non-digits. PlainDocument doc = new PlainDocument(); doc.setDocumentFilter(new DocumentFilter() { @Override public void insertString(FilterBypass fb, int off, String str, AttributeSet attr) throws BadLocationException { fb.insertString(off, str.replaceAll(“\\D++”, “”), attr); // remove non-digits } @Override public void replace(FilterBypass fb, int off, int len, String str, AttributeSet … Read more
Here’s an example of using InputVerifier to accommodate multiple input formats. import java.awt.EventQueue; import java.text.NumberFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import javax.swing.Box; import javax.swing.InputVerifier; import javax.swing.JComponent; import javax.swing.JFormattedTextField; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.text.DateFormatter; import javax.swing.text.DefaultFormatterFactory; public class FormattedFields { public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { //@Override … Read more
You can do something like this (taken from here): import java.awt.FlowLayout; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.PlainDocument; class JTextFieldLimit extends PlainDocument { private int limit; JTextFieldLimit(int limit) { super(); this.limit = limit; } JTextFieldLimit(int limit, boolean upper) { super(); this.limit = limit; } public void insertString(int offset, String str, … Read more
Here check this code snippet, that’s how you allow only digits in JTextField, by using DocumentFilter, as the most effeciive way : import java.awt.*; import javax.swing.*; import javax.swing.text.AbstractDocument; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.DocumentFilter; import javax.swing.text.DocumentFilter.FilterBypass; public class InputInteger { private JTextField tField; private MyDocumentFilter documentFilter; private void displayGUI() { JFrame frame = new JFrame(“Input … Read more
1) you have to sort your array before use for better performance… 2) as I mentioned you have to take these two clasess 3) don’t forget set initial value for better and nicest work with these Components simple output from code import java.awt.*; import java.util.ArrayList; import javax.swing.*; public class AutoCompleteTextField { private JFrame frame; private … Read more
Here’s an example of a resizable component that might be suitable for such a game. Although it contains no game logic, it handles input reasonably well. Clicking the mouse or pressing the space bar pop’s up a menu, and the tab and number keys work as expected. In particular, Digit.EMPTY is a valid value. import … Read more
Do not use a KeyListener for this as you’ll miss much including pasting of text. Also a KeyListener is a very low-level construct and as such, should be avoided in Swing applications. The solution has been described many times on SO: Use a DocumentFilter. There are several examples of this on this site, some written … Read more
Add a listener to the underlying Document, which is automatically created for you. // Listen for changes in the text textField.getDocument().addDocumentListener(new DocumentListener() { public void changedUpdate(DocumentEvent e) { warn(); } public void removeUpdate(DocumentEvent e) { warn(); } public void insertUpdate(DocumentEvent e) { warn(); } public void warn() { if (Integer.parseInt(textField.getText())<=0){ JOptionPane.showMessageDialog(null, “Error: Please enter number … Read more