square root of a number in java

/**
 * @author lautturi.com 
 * Java example: calculate square root of a number in java
 */

import java.util.*;

public class Lautturi {
	public static void main(String[] args) {
		int num= 9;
		System.out.println(Math.pow(num,0.5));
		System.out.println(Math.sqrt(9));
	}
}

output:

3.0
3.0