get length of integer in java

/**
 * @author lautturi.com 
 * Java example: get length of number in java
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {
		Integer number = 1234;
		int length = (int) (Math.log10(number) + 1);
		System.out.println(length);
	}
}

output:

4