cylindricalparcel.java

来自「Java程序设计(美) David D. Riley著 机械工业出版社 书籍配套」· Java 代码 · 共 26 行

// Figure 8.5

public class CylindricalParcel  extends Parcel  {
	private  double parcelRadius, parcelLength;

	/** post:	parcelLength == len  AND  parcelRadius == r
	 *			and volume == len*r*r*PI 
	 *			and weight == volume*600 
	 *			and isAirFreight==false */
	public CylindricalParcel( double len, double r)   {
		super( 0, 0, false );
		parcelLength = len;
		parcelRadius = r;
		volume = parcelLength * Math.PI * Math.pow(parcelRadius,2);
		weight = volume * 600;
	}
	
	public double length()  {
		return parcelLength;
	}
	
	public double radius() {
		return parcelRadius;
	}
}