Java Code:
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.font.FontRenderContext;
import java.awt.font.TextHitInfo;
import java.awt.font.TextLayout;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class TextHitInfoDemo extends JPanel {
  private TextLayout mTextLayout;

  private int mX = 40, mY = 80;

  public TextHitInfoDemo() {
    addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent me) {
        TextHitInfo hit = mTextLayout.hitTestChar(me.getX() - mX, me
            .getY()
            - mY);
        System.out.println(hit);
      }
    });
  }

  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;

    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);

    String s = "Java Source and Support";
    Font font = new Font("Serif", Font.PLAIN, 32);

    if (mTextLayout == null) {
      FontRenderContext frc = g2.getFontRenderContext();
      mTextLayout = new TextLayout(s, font, frc);
    }

    mTextLayout.draw(g2, mX, mY);
  }
  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.getContentPane().add(new TextHitInfoDemo());
    f.setSize(200, 200);
    f.show();
  }
}