Ajuda para testar codigo abaixo

import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;

import javax.swing.JFormattedTextField;
import javax.swing.JTextField;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;
import javax.swing.text.SimpleAttributeSet;

/**
 * Component JMoneyField
 * @author Dyorgio da Silva Nascimento
 */
public class JMoneyField extends JFormattedTextField {
    
	private static final long serialVersionUID = -5712106034509737967L;
	private static final SimpleAttributeSet nullAttribute = new SimpleAttributeSet();
	
    /**
     * Creates a new instance of JMoneyField
     */
    public JMoneyField() {
    	this.setHorizontalAlignment( JTextField.CENTER );
    	this.setDocument(new MoneyFieldDocument());
        this.addFocusListener(new MoneyFieldFocusListener());
        this.setText("0,00");
        this.addCaretListener(new CaretListener(){
        	public void caretUpdate(CaretEvent e) {
        		if (e.getDot() != getText().length() ) {
        			getCaret().setDot(getText().length());
        		}
        	}
        });
    }
    
    private final class MoneyFieldFocusListener extends FocusAdapter{
    	public void focusGained(FocusEvent e) {
			selectAll();
		}
    }
    
    private final class MoneyFieldDocument extends PlainDocument {
    	
    	/**
		 * 
		 */
		private static final long serialVersionUID = -3802846632709128803L;

		public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
     		String original = getText(0,getLength());
     		
     		// Permite apenas digitar até 16 caracteres (9.999.999.999,99)
     		if (original.length()<16) {
     			StringBuffer mascarado = new StringBuffer();
     			if (a != nullAttribute) {
     				//limpa o campo
     				remove(-1,getLength());
     				
     				mascarado.append((original+str).replaceAll("[^0-9]",""));
         			for (int i = 0; i < mascarado.length(); i++){
         				if (!Character.isDigit(mascarado.charAt(i))){
         					mascarado.deleteCharAt(i);
         				}
         			}
         			Long number = new Long(mascarado.toString());
         			
         			mascarado.replace(0, mascarado.length(), number.toString());
         			
         			if ( mascarado.length() < 3 )
         			{
	         			if ( mascarado.length() == 1 ) {
	         				mascarado.insert(0,"0");
	         				mascarado.insert(0,",");
	         				mascarado.insert(0,"0");
	         			}else if ( mascarado.length() == 2 ) {
	         				mascarado.insert(0,",");
	         				mascarado.insert(0,"0");
	         			}
         			}else{
         				mascarado.insert(mascarado.length()-2,",");
         			}
         			
         			if ( mascarado.length() > 6 ) {
         				mascarado.insert(mascarado.length()-6, '.');
         				if (mascarado.length() > 10 ) {
         					mascarado.insert(mascarado.length()-10, '.');
         					if (mascarado.length() > 14 ) {
             					mascarado.insert(mascarado.length()-14, '.');
         					}
         				}
         			}
         			super.insertString(0, mascarado.toString(), a);
     			}else{
     				if (original.length() == 0){
     					super.insertString(0, "0,00", a);
     				}
     			}
     		}
     	}
    	
    	@Override
    	public void remove(int offs, int len) throws BadLocationException {
    		if ( len == getLength() ) {
    			super.remove(0, len);
    			if (offs != -1){
	    			insertString(0, "",nullAttribute);
    			}
    		}else{
    			String original = getText(0, getLength()).substring(0, offs) + getText(0, getLength()).substring(offs+len);
    			super.remove(0, getLength());
    			insertString(0,original,null);
    		}
    	}
    }
}