Kali ini saya membuat tutorial sederhana untuk membuat sebuah input pada Java (Swing) langsung merubah format isiannya menjadi angka dengan pemisah ribuan, misalnya ketika diinput 1000 akan berubah menjadi 1.000, namun tetap dengan menyimpan data aslinya, sehingga apabila diinginkan, tetap dapat diambil data asli input tersebut.

javSaya berikan dalam 2 file (Class), dimana Class utama dari tutorial ini adalah Class NumberTextField. Sedangkan class Main hanya berfungsi demo saja.

Aplikasi (executable) jar demo ini bisa didownload disini.

Class NumberTextField (file NumberTextField.java)

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import javax.swing.*;
import javax.swing.text.MaskFormatter;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
 
/**
 * Created with IntelliJ IDEA.
 * Author: Lee
 * Date: 5/20/2014
 * Time: 1:50 PM
 * To change this template use File | Settings | File Templates.
 */
public class NumberTextField extends JTextField {
    private char separator = '.';
 
    public NumberTextField(){
        super();
        setHorizontalAlignment(SwingConstants.RIGHT);
        setText("0");
        addFocusListener(new FocusAdapter() {
            @Override
            public void focusGained(FocusEvent focusEvent) {
                NumberTextField.super.setText(getText());
                NumberTextField.super.selectAll();
            }
 
            @Override
            public void focusLost(FocusEvent e){
                setText(NumberTextField.super.getText());
            }
        });
        addKeyListener(new KeyAdapter() {
            @Override
            public void keyTyped(KeyEvent e) {
                char c = e.getKeyChar();
                if (!((c >= '0') && (c <= '9') ||
                        (c == KeyEvent.VK_BACK_SPACE) ||
                        (c == KeyEvent.VK_DELETE))) {
                    getToolkit().beep();
                    e.consume();
                }
            }
        });
        // */
    }
 
    public void setSeparator(char s){
        separator = s;
    }
 
    @Override
    public void setText(String s){
        super.setText(formatNumber(s));
    }
 
    @Override
    public String getText() {
        String s = super.getText();
        return s.replaceAll("[^0-9]", "");
    }
 
    public String getNumberFormattedText(){
        return super.getText();
    }
 
    public String formatNumber(String s){
        try {
            int v = Integer.parseInt(s);
            return String.format("%,d", v).replace(",", separator + "");
        } catch (Exception e) {
            return "0";
        }
    }
    // */
}

Class Main (file Main.java)

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import sun.awt.HorizBagLayout;
 
import javax.swing.*;
import javax.swing.border.Border;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
 * Created with IntelliJ IDEA.
 * User: lee
 * Date: 6/22/14
 * Time: 1:01 PM
 */
public class Main {
    public static void main(String[] args){
        try{
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e){
 
        }
 
        final JFrame f = new JFrame();
        f.setTitle("Number Formatted Input Field");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setMinimumSize(new Dimension(400, 100));
 
        final JPanel body = new JPanel();
        body.setLayout(new BoxLayout(body, BoxLayout.Y_AXIS));
        body.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
        f.getContentPane().add(body, BorderLayout.CENTER);
 
        for(int i = 1; i <= 5; i++){
            JPanel p = new JPanel();
            p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS));
            p.add(new JLabel("Input " + i));
            p.add(Box.createHorizontalStrut(10));
 
            NumberTextField input = new NumberTextField();
            // misalnya diinginkan separator ribuan yang 'aneh';
//            input.setSeparator('-');
 
            p.add(input);
            body.add(p);
            body.add(Box.createVerticalStrut(5));
        }
 
        JButton b = new JButton("Lihat Input");
        b.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                String res = "", temp;
                for(int i = 1; i <= 10; i++){
                    if( i % 2 == 0) continue;
                    JPanel p;
                    try{
                        p = (JPanel) body.getComponent(i - 1);
                    } catch (Exception e){
                        System.out.println("Error: " + i);
                        e.printStackTrace();
                        continue;
                    }
 
                    temp = String.format("input ke %s diisi %s = %s \n", (i / 2) + 1,
                            ((NumberTextField) p.getComponent(2)).getText(),
                            ((NumberTextField) p.getComponent(2)).getNumberFormattedText()
                    );;
                    if(res.equals("")){
                        res = temp;
                    } else {
                        res += temp;
                    }
                }
                JOptionPane.showMessageDialog(f, res);
            }
        });
        body.add(b);
 
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
}

Sebagai catatan, GUI dari aplikasi ini tidak saya buat dengan Builder (misalnya Netbeans), jadi tidak ada operasi drag n drop untuk GUI nya. Lagipula, GUI ini hanya demo saja.

Namun tentu saja jangan lupa, untuk kepentingan format angka yang lebih canggih, ada NumberFormat di Java.

sumber: kurungkurawal.com

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