import java.awt.Color;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.RenderingHints;
import javax.swing.JTextField;

public class JHintTextField extends JTextField {

    private String hint = "";

    public JHintTextField() {
    }

    public JHintTextField(String hint) {
        setHint(hint);
    }

    public final void setHint(String hint) {
        if (hint != null) {
            this.hint = hint;
        } else {
            this.hint = "";
        }
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        if (getText().length() == 0) {
            int h = getHeight();
            ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            Insets ins = getInsets();
            FontMetrics fm = g.getFontMetrics();
            int c0 = getBackground().getRGB();
            int c1 = getForeground().getRGB();
            int m = 0xfefefefe;
            int c2 = ((c0 & m) >>> 1) + ((c1 & m) >>> 1);
            g.setColor(new Color(c2, true));
            g.drawString(hint, ins.left, h / 2 + fm.getAscent() / 2 - 1);
        }
    }
}