import java.util.Scanner;  // Demo in BlueJ

public class BooleanVar
{
   public static void main(String[] args)
   {
       double radius = 0;    // Try changing radius
       boolean isNegative;
 
       isNegative = radius < 0; // Evaluate radius < 0 and
                                // assign result to isNegative
   }                       
}