[Ask] Batasan karakter pasda teks field Java

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Halo devilzc0der, sebelumnya maaf kalo salah ruang,,,, ane mau nanya nih tentang Java ,,,
ane dapet tugas kuliah buat konvert teks (dalam program java ini teks NOPEL jadi IDPEL, ataupun sebaliknya), ane ada kesulitan:
1. Kan di teks dibatasi validasi minimal 9 karakter dan maksimal 9 karakter (mau gak mau harus 9 karakter), nah program ane ini baru muncul peringatan validasi teks apabila setelah diklik konvert, ane kepinginnya ada batasan gitu, intinya gak bisa ketik karakter lagi setelah ngisi 9 karakter, nah itu gimana solusinya?...
2. Fungsi konvert belum berjalan cz kodenya masih dalam bentuk jOptionPane (nopel.java), saya kesulitan untuk memasukkan ke dalam NopelIdpel.java, mohon solusinya...
(yang masukin full name itu sebenernya masukin nopel, mis CD0532056.
Trus di line 12 itu harusnya ini int [] angka = {7,5,2,1,7,5,2,1,7,5,2,1};)
Minta bantuan ya, maksih bangeeeetttt....


nopel.java

Spoiler:

PHP Code:

import javax.swing.JOptionPane;

public class nopel{

    public static void main(String[] args){
        String nopel = "CB051350";
        int b = nopel.length();
        char [] pecahnopel = new char[b];
        String [][]kd_area = {{"A","1"},{"B","2"},{"C","3"},{"D","4"},{"E","5"},{"F","6"},{"G","7"},{"H","8"},{"I","9"}};
        String [][]kd_unit = {{"B","01"},{"C","02"},{"D","03"},{"E","04"},{"F","05"}};
        String kdwil = "51";
        int [] angka = {7,5,2,1,7,5,2,1,7,5,2};

        nopel = JOptionPane.showInputDialog(null, "Enter your full name: ");
        nopel = nopel.toUpperCase();
            pecahnopel[0] = nopel.charAt(0);
            for(int c=0;c<kd_area.length;c++){
                if(kd_area[c][0].equals(Character.toString(pecahnopel[0]))){
                    kdwil = kdwil.concat(kd_area[c][1]);
                    break;
                }
            }
            
            pecahnopel[1] = nopel.charAt(1);
            for(int c=0;c<kd_unit.length;c++){
                if(kd_unit[c][0].equals(Character.toString(pecahnopel[1]))){
                    kdwil = kdwil.concat(kd_unit[c][1]);
                    break;
                }
            }
            
            kdwil = kdwil.concat(nopel.substring(2));

            int []angka2 = new int[kdwil.length()];
            int []angka3 = new int[kdwil.length()];
            int []angka4 = new int[kdwil.length()];
            int nilaicek = 0;
            for(int d=0;d<kdwil.length();d++){
                int nilai = Character.getNumericValue(kdwil.charAt(d));

                angka2[d] = nilai;
                angka3[d] = angka[d]*angka2[d];

                String tes = String.valueOf(angka3[d]);

                if(tes.length() > 1){

                int temp1 = Character.getNumericValue(tes.charAt(0));
                int temp2 = Character.getNumericValue(tes.charAt(1));
                temp1 = temp1+temp2;
                angka4[d] = temp1;
                }
                else{
                angka4[d] = Character.getNumericValue(tes.charAt(0));
                }
                nilaicek = nilaicek+angka4[d];
                
            }
            String cek = String.valueOf(nilaicek);
            if(cek.length()>1){
                int cek1 = Character.getNumericValue(cek.charAt(1));
                if(cek1 == 0){
                kdwil = kdwil.concat(String.valueOf(0));
                System.out.println("Nopel = "+nopel);
                System.out.println("IDPEL = "+kdwil);
                JOptionPane.showMessageDialog(null, "IDPEL = " + kdwil); 
                }
                else{
                cek1 = 10-cek1;
                kdwil = kdwil.concat(String.valueOf(cek1));
                System.out.println("Nopel = "+nopel);
                System.out.println("IDPEL = "+kdwil);
                JOptionPane.showMessageDialog(null, "IDPEL = " + kdwil);
                }
            }
            

    }
} 


NopelIdpel.java

Spoiler:

PHP Code:

import java.awt.Color;
import java.awt.event.KeyEvent;
import javax.print.attribute.AttributeSet;
import javax.swing.JOptionPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * NopelIdpel.java
 *
 * Created on Feb 16, 2012, 8:53:48 AM
 */
/**
 *
 * @author Admin
 */
public class NopelIdpel extends javax.swing.JFrame {

    /** Creates new form NopelIdpel */
    public NopelIdpel() {
        initComponents();
        //txtNopel.setDocument(new batasiInput((byte)9).getFilter());
        this.setLocationRelativeTo(null);
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jTextField1 = new javax.swing.JTextField();
        buttonGroup1 = new javax.swing.ButtonGroup();
        buttonGroup2 = new javax.swing.ButtonGroup();
        lblJudul = new javax.swing.JLabel();
        lblNopel = new javax.swing.JLabel();
        lblIdpel = new javax.swing.JLabel();
        txtNopel = new javax.swing.JTextField();
        txtIdpel = new javax.swing.JTextField();
        btnConvert = new javax.swing.JButton();
        btnClear = new javax.swing.JButton();
        btnClose = new javax.swing.JButton();
        pnlColor = new javax.swing.JPanel();
        cbRed = new javax.swing.JCheckBox();
        cbBlue = new javax.swing.JCheckBox();
        cbGray = new javax.swing.JCheckBox();
        pnlKonversi = new javax.swing.JPanel();
        rbtNopel = new javax.swing.JRadioButton();
        rbtIdpel = new javax.swing.JRadioButton();
        jSeparator1 = new javax.swing.JSeparator();
        lblFormatNopel = new javax.swing.JLabel();
        lblFormatIdpel = new javax.swing.JLabel();

        jTextField1.setText("jTextField1");

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        lblJudul.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
        lblJudul.setText("KONVERSI NOPEL KE IDPEL");

        lblNopel.setFont(new java.awt.Font("Tahoma", 1, 14)); // NOI18N
        lblNopel.setText("NOPEL");

        lblIdpel.setFont(new java.awt.Font("Tahoma", 1, 14));
        lblIdpel.setText("IDPEL");

        txtNopel.setToolTipText("");
        txtNopel.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                txtNopelActionPerformed(evt);
            }
        });

        btnConvert.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        btnConvert.setText("CONVERT");
        btnConvert.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnConvertActionPerformed(evt);
            }
        });

        btnClear.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        btnClear.setText("CLEAR");
        btnClear.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnClearActionPerformed(evt);
            }
        });

        btnClose.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        btnClose.setText("CLOSE");
        btnClose.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnCloseActionPerformed(evt);
            }
        });

        buttonGroup1.add(cbRed);
        cbRed.setText("Red");
        cbRed.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                cbRedActionPerformed(evt);
            }
        });

        buttonGroup1.add(cbBlue);
        cbBlue.setText("White");
        cbBlue.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                cbBlueActionPerformed(evt);
            }
        });

        buttonGroup1.add(cbGray);
        cbGray.setText("Gray");
        cbGray.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                cbGrayActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout pnlColorLayout = new javax.swing.GroupLayout(pnlColor);
        pnlColor.setLayout(pnlColorLayout);
        pnlColorLayout.setHorizontalGroup(
            pnlColorLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(pnlColorLayout.createSequentialGroup()
                .addContainerGap()
                .addGroup(pnlColorLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(cbBlue)
                    .addComponent(cbGray)
                    .addComponent(cbRed))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        pnlColorLayout.setVerticalGroup(
            pnlColorLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(pnlColorLayout.createSequentialGroup()
                .addGap(10, 10, 10)
                .addComponent(cbRed)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(cbBlue, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(cbGray)
                .addContainerGap(21, Short.MAX_VALUE))
        );

        buttonGroup2.add(rbtNopel);
        rbtNopel.setText("Konversi Nopel");
        rbtNopel.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                rbtNopelActionPerformed(evt);
            }
        });

        buttonGroup2.add(rbtIdpel);
        rbtIdpel.setText("Konversi Idpel");
        rbtIdpel.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                rbtIdpelActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout pnlKonversiLayout = new javax.swing.GroupLayout(pnlKonversi);
        pnlKonversi.setLayout(pnlKonversiLayout);
        pnlKonversiLayout.setHorizontalGroup(
            pnlKonversiLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, pnlKonversiLayout.createSequentialGroup()
                .addComponent(rbtNopel)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 3, Short.MAX_VALUE)
                .addComponent(rbtIdpel)
                .addContainerGap())
        );
        pnlKonversiLayout.setVerticalGroup(
            pnlKonversiLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(pnlKonversiLayout.createSequentialGroup()
                .addContainerGap()
                .addGroup(pnlKonversiLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(rbtIdpel)
                    .addComponent(rbtNopel))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        lblFormatNopel.setFont(new java.awt.Font("Tahoma", 0, 10)); // NOI18N
        lblFormatNopel.setForeground(new java.awt.Color(51, 51, 51));
        lblFormatNopel.setText("mis: CN0622067");

        lblFormatIdpel.setFont(new java.awt.Font("Tahoma", 0, 10)); // NOI18N
        lblFormatIdpel.setForeground(new java.awt.Color(51, 51, 51));
        lblFormatIdpel.setText("mis: 513010285649");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGap(83, 83, 83)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(btnClear)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(btnConvert, javax.swing.GroupLayout.PREFERRED_SIZE, 101, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(btnClose, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(lblNopel, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(lblIdpel))
                        .addGap(18, 18, 18)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addGroup(layout.createSequentialGroup()
                                .addGap(2, 2, 2)
                                .addComponent(lblFormatNopel, javax.swing.GroupLayout.PREFERRED_SIZE, 89, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(layout.createSequentialGroup()
                                .addGap(2, 2, 2)
                                .addComponent(lblFormatIdpel, javax.swing.GroupLayout.PREFERRED_SIZE, 110, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addComponent(txtIdpel)
                            .addComponent(txtNopel)
                            .addComponent(jSeparator1, javax.swing.GroupLayout.DEFAULT_SIZE, 280, Short.MAX_VALUE))))
                .addGap(30, 30, 30)
                .addComponent(pnlColor, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(73, 73, 73))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(lblJudul)
                .addGap(181, 181, 181))
            .addGroup(layout.createSequentialGroup()
                .addGap(202, 202, 202)
                .addComponent(pnlKonversi, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGap(210, 210, 210))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(lblJudul)
                        .addGap(19, 19, 19)
                        .addComponent(pnlKonversi, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jSeparator1, javax.swing.GroupLayout.PREFERRED_SIZE, 10, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(txtNopel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(lblNopel))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(lblFormatNopel)
                        .addGap(18, 18, 18)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(txtIdpel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(lblIdpel))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(lblFormatIdpel)
                        .addGap(34, 34, 34)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(btnConvert)
                            .addComponent(btnClear)
                            .addComponent(btnClose))
                        .addGap(26, 26, 26))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(pnlColor, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(83, 83, 83))))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents
private void txtNopelKeyPressed(java.awt.event.KeyEvent evt) {                                       
        // TODO add your handling code here:
        int nilai_enter=evt.VK_ENTER;
        int kode=evt.getKeyCode();
        if (kode==nilai_enter){
            JOptionPane.showMessageDialog(null, "Anda telah menekan tombol ENTER untuk memproses...");
        }
    }      
    
    
private void txtNopelActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_txtNopelActionPerformed
// TODO add your handling code here:
}//GEN-LAST:event_txtNopelActionPerformed

private void batasiKarakter(){
    int banyakKarakter=txtNopel.getText().length();
    if(banyakKarakter<9){
        JOptionPane.showMessageDialog(null, "Karakter yang Anda masukkan kurang dari 9 karakter");
        txtNopel.setText("");
    }
    else if (banyakKarakter>9){
        JOptionPane.showMessageDialog(null, "Karakter yang Anda masukkan melebihi dari 9 karakter");
        txtNopel.setText("");
    }
}

private void btnConvertActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnConvertActionPerformed
// TODO add your handling code here:
    batasiKarakter();
}//GEN-LAST:event_btnConvertActionPerformed

private void btnClearActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnClearActionPerformed
// TODO add your handling code here:
    txtNopel.setText("");
    txtIdpel.setText("");
}//GEN-LAST:event_btnClearActionPerformed

private void btnCloseActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnCloseActionPerformed
// TODO add your handling code here:
    System.exit(0);
}//GEN-LAST:event_btnCloseActionPerformed

private void cbBlueActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_cbBlueActionPerformed
// TODO add your handling code here:
this.getContentPane().setBackground(Color.WHITE);
}//GEN-LAST:event_cbBlueActionPerformed

private void cbGrayActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_cbGrayActionPerformed
// TODO add your handling code here:
this.getContentPane().setBackground(Color.LIGHT_GRAY);
}//GEN-LAST:event_cbGrayActionPerformed

private void cbRedActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_cbRedActionPerformed
// TODO add your handling code here:
this.getContentPane().setBackground(Color.CYAN);
}//GEN-LAST:event_cbRedActionPerformed

private void rbtIdpelActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_rbtIdpelActionPerformed
// TODO add your handling code here:
txtNopel.setEnabled(false);
txtIdpel.setEnabled(true);
lblFormatIdpel.setEnabled(true);
lblFormatNopel.setEnabled(false);
txtIdpel.setText("");
}//GEN-LAST:event_rbtIdpelActionPerformed

private void rbtNopelActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_rbtNopelActionPerformed
// TODO add your handling code here:
txtIdpel.setEnabled(false);
txtNopel.setEnabled(true);
lblFormatNopel.setEnabled(true);
lblFormatIdpel.setEnabled(false);
txtNopel.setText("");
}//GEN-LAST:event_rbtNopelActionPerformed

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(NopelIdpel.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(NopelIdpel.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(NopelIdpel.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(NopelIdpel.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new NopelIdpel().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton btnClear;
    private javax.swing.JButton btnClose;
    private javax.swing.JButton btnConvert;
    private javax.swing.ButtonGroup buttonGroup1;
    private javax.swing.ButtonGroup buttonGroup2;
    private javax.swing.JCheckBox cbBlue;
    private javax.swing.JCheckBox cbGray;
    private javax.swing.JCheckBox cbRed;
    private javax.swing.JSeparator jSeparator1;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JLabel lblFormatIdpel;
    private javax.swing.JLabel lblFormatNopel;
    private javax.swing.JLabel lblIdpel;
    private javax.swing.JLabel lblJudul;
    private javax.swing.JLabel lblNopel;
    private javax.swing.JPanel pnlColor;
    private javax.swing.JPanel pnlKonversi;
    private javax.swing.JRadioButton rbtIdpel;
    private javax.swing.JRadioButton rbtNopel;
    private javax.swing.JTextField txtIdpel;
    private javax.swing.JTextField txtNopel;
    // End of variables declaration//GEN-END:variables

//    class batasiInput{
//        byte length;
//        PlainDocument filter;
//        public batasiInput(byte length){
//            this.length=length;
//        }
//        public PlainDocument getFilter(){
//            filter=new PlainDocument(){
//                public void insertString(int offs, String str,AttributeSet a) throws BadLocationException{
//                    int ab=txtNopel.getText().length();
//                    if(ab<length){
//                        //super.insertString(offs, str, null);
//                        super.insertString(offs, str, a);
//                    }
//                }
//            };
//            return filter;
//        }
//    }
} 


Makasiihhhh,,,,

[Fauzi Topan]

salah kamar deh bang, harusnya di subforum java nih
http://devilzc0de.org/forum/forumdisplay.php?fid=47