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copied!<p>The key is to deal with the <a href="http://docs.oracle.com/javase/7/docs/api/java/awt/FontMetrics.html" rel="nofollow">FontMetrics</a> API. The best you can do is looking at this <a href="http://docs.oracle.com/javase/tutorial/2d/text/measuringtext.html" rel="nofollow">reference doc</a>.</p> <p>Here is a sample code demonstrating this usage. It draws red and blue lines around an "Hello world" text according a range of chars.</p> <p>The text is inside a JLabel, but you can adapt the paint method on any component (but you will have to call <code>graphics.drawChars</code> to paint the text.)</p> <p>(the code is not very nice, but it demonstrates the usage of FontMetrics)</p> <pre><code>package com.example.swing; import javax.swing.*; import java.awt.*; public class DemoFontMetrics { public static void main(String[] args){ JFrame frame = new JFrame(); DecoratedLabel label = new DecoratedLabel("hello world !",new int[]{2,4}, new int[]{6,9}); JPanel textContainer = new JPanel(new FlowLayout()); textContainer.setBorder(BorderFactory.createEmptyBorder(5,5,5,5)); textContainer.add(label); frame.getContentPane().add(textContainer); frame.pack(); frame.setVisible(true); } private static class DecoratedLabel extends JLabel{ int startBlue; int endBlue; int startRed; int endRed; private DecoratedLabel(String text, int[] blueRange, int[] redRange) { super(text); startBlue = blueRange[0]; endBlue = blueRange[1]; startRed = redRange[0]; endRed = redRange[1]; } @Override public void paint(Graphics g) { super.paint(g); //draw text //set line with : 3 Stroke stroke = new BasicStroke(3f); ((Graphics2D)g).setStroke(stroke); FontMetrics fm = g.getFontMetrics(); int h = fm.getHeight(); //compute blue line coordonate fm.stringWidth(getText().substring(0,startBlue)); int x1 = fm.stringWidth(getText().substring(0, startBlue)); int x2 = fm.stringWidth(getText().substring(0, endBlue)); g.setColor(Color.BLUE); g.drawLine(x1,0,x2,0);// draw blue line //compute red line coordonates int x3 = fm.stringWidth(getText().substring(0,startRed)); int x4 = fm.stringWidth(getText().substring(0, endRed)); g.setColor(Color.RED); g.drawLine(x3,h-1,x4,h-1); // draw redline } } } </code></pre>

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