circle4.java

来自「Cylinder Project, Java Application」· Java 代码 · 共 66 行

/*
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 * and open the template in the editor.
 */

package cylinder;

/**
 *
 * @author Rossiter
 */
public class Circle4 extends Point3 {

   private double radius;  // Circle4's radius

   // no-argument constructor
   public Circle4()
   {
      // implicit call to Point3 constructor occurs here
   }

   // constructor
   public Circle4( int xValue, int yValue, double radiusValue )
   {
      super( xValue, yValue );  // call Point3 constructor explicitly
      setRadius( radiusValue );
   }

   // set radius
   public void setRadius( double radiusValue )
   {
      radius = ( radiusValue < 0.0 ? 0.0 : radiusValue );
   }

   // return radius
   public double getRadius()
   {
      return radius;
   }

   // calculate and return diameter
   public double getDiameter()
   {
      return 2 * getRadius();
   }

   // calculate and return circumference
   public double getCircumference()
   {
      return Math.PI * getDiameter();
   }

   // calculate and return area
   public double getArea()
   {
      return Math.PI * getRadius() * getRadius();
   }

   // return String representation of Circle4 object
   public String toString()
   {
      return "Center = " + super.toString() + "; Radius = " + getRadius();
   }

} // end class Circle4