Añade un PlaceHolder a un JTextField

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Insets;
import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;

/**
 * @web https://www.jc-mouse.net/
 * @author Mouse
 */
public class JCTextField extends JTextField{

    private Dimension d = new Dimension(200,32);
    private String placeholder = "";
    private Color phColor= new Color(0,0,0);
    private boolean band = true;

    /** Constructor de clase */
    public JCTextField()
    {
        super();
        setSize(d);
        setPreferredSize(d);
        setVisible(true);
        setMargin( new Insets(3,6,3,6));
        //atento a cambios 
        getDocument().addDocumentListener(new DocumentListener() {

            @Override
            public void removeUpdate(DocumentEvent e) {
                band = (getText().length()>0) ? false:true ;
            }

            @Override
            public void insertUpdate(DocumentEvent e) {
                band = false;
            }

            @Override
            public void changedUpdate(DocumentEvent de) {}

        });
    }

    public void setPlaceholder(String placeholder)
    {
        this.placeholder=placeholder;
    }

    public String getPlaceholder()
    {
        return placeholder;
    }

    public Color getPhColor() {
        return phColor;
    }

    public void setPhColor(Color phColor) {
        this.phColor = phColor;
    }    

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        //color de placeholder 
        g.setColor( new Color(phColor.getRed(),phColor.getGreen(),phColor.getBlue(),90));
        //dibuja texto
        g.drawString((band)?placeholder:"",
                     getMargin().left,
                     (getSize().height)/2 + getFont().getSize()/2 );
      }

}//JCTextField:end

//default
JCTextField jCTextField1 = new JCTextField();
jCTextField1.setLocation(40, 40);
jCTextField1.setPlaceholder("Escribe tu E-Mail");
add(jCTextField1);

//Custom
JCTextField jCTextField2 = new JCTextField();
jCTextField2.setLocation(40, 100);
jCTextField2.setPlaceholder("First Name please");
jCTextField2.setSize( new Dimension(300,56));
jCTextField2.setPhColor( new Color(72,117,210) );
jCTextField2.setFont( new Font("SansSerif",Font.PLAIN, 18) );
add(jCTextField2);