Calculate the area of a circle in java

/**
 * @author lautturi.com
 * Java example: get the area of circle in java
 */

import java.util.*;
import java.time.*;
import java.time.format.*;

public class Lautturi {

	public static void main(String[] args) {

		int radius = 10;
		double area;
		
		area = (radius * radius) * Math.PI;
		System.out.println("Area of the circle is :" + area);
	}

}

output:

Area of the circle is :314.1592653589793