Determine if the character is a digit in java

/**
 * @author lautturi.com
 * Java example: check whether a character is a digit in java
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {

		System.out.println(Character.isDigit('x')); // false 
		System.out.println(Character.isDigit('3')); // true

	}
}