Contoh Program
Di bawah ini adalah contoh program untuk membatasi panjang karakter pada JTextField.
Nama File : JTextFieldLengthLimitDemo.java
package com.nursalim.zone.java.swing; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.LookAndFeel; import javax.swing.UIManager; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.PlainDocument; public class JTextFieldLengthLimitDemo extends JFrame { /** * */ private static final long serialVersionUID = -2557628370374830362L; private JTextField textField; private JLabel label; private JPanel panel; private Integer limit = 5; // Maksimal 5 Karakter public JTextFieldLengthLimitDemo() { initComponents(); add(panel); textField.setDocument(new PlainDocument(){ @Override public void insertString(int offset, String str, AttributeSet attributeSet) throws BadLocationException { if(getLength() + str.length() <= limit){ super.insertString(offset, str, attributeSet); }else{ label.setText("Panjang Maksimal User ID "+limit+" Huruf"); } } }); } private void initComponents(){ textField = new JTextField(20); label = new JLabel("User ID"); panel = new JPanel(); panel.add(textField); panel.add(label); setTitle("JTextFild Limit"); setSize(400, 200); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLocationRelativeTo(null); setResizable(false); } public static void main (String[] arg){ try{ UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); new JTextFieldLengthLimitDemo().setVisible(true); }catch(Exception ex){ } } }
Compile & Running
Coba compile dan jalankan program diatas, maka akan tampil gambar seperti dibawah ini :
Coba masukkan karakter/kata lebih, maka akan tampil message seperti dibawah ini :
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