how to get file extension from a file name in java

/**
 * @author lautturi.com
 * Java example: get file name and extension from filename in java
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {
		
		String textfile = "ReadMe.txt"; 
		String filename = textfile.split("\\.")[0]; 
		String extension = textfile.split("\\.")[1];
		
		System.out.println(filename);
		System.out.println(extension);
		
	}
}