Trying to figure out why this sint compiling... (Java)

import java.text.DecimalFormat;

public class TestCircle

{

public static void main(String[] args)

{

DecimalFormat showTwoDecimals = new DecimalFormat( "0.00" );

Circle c1 = new Circle(2.5, 22, 44);

System.out.println("This shape is a " + c1.getName() +

" located at " + c1.getLocation() +

" Radius is " + c1.getRadius());

System.out.println("The shape area is: " + showTwoDecimals.format(c1.area())+" ");

c1.setRadius(4.25);

System.out.println(" The changed shape is: " +

c1 + " Area is " + showTwoDecimals.format(c1.area())+" ");

}

}