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import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.text.DefaultHighlighter;
import javax.swing.text.Highlighter;
public class Main {
public static void main(String args[]) throws Exception {
JFrame frame = new JFrame("MultiHighlight");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextArea comp = new JTextArea(5, 20);
comp.setText("this is a test");
frame.getContentPane().add(new JScrollPane(comp), BorderLayout.CENTER);
String charsToHighlight = "a";
Highlighter h = comp.getHighlighter();
h.removeAllHighlights();
String text = comp.getText().toUpperCase();
for (int j = 0; j < text.length(); j += 1) {
char ch = text.charAt(j);
if (charsToHighlight.indexOf(ch) >= 0)
h.addHighlight(j, j + 1, DefaultHighlighter.DefaultPainter);
}
frame.pack();
frame.setVisible(true);
}
}
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