paint.java

来自「Java the UML Way 书中所有源码」· Java 代码 · 共 43 行

/*
 * Paint.java   E.L. 2001-08-15
 *.
 */
class Paint extends Material {
  private static final double limit = 0.02;  // limit to buy 0.5 liters more
  private int noOfCoats;
  private double noOfSqMPerLiter;

  public Paint(String initName, double initPrice, int initNoOfCoats,
      double initNoOfSqMPerLiter) {
    super(initName, initPrice);
    noOfCoats = initNoOfCoats;
    noOfSqMPerLiter = initNoOfSqMPerLiter;
  }

  public int getNoOfCoats() {
    return noOfCoats;
  }

  public double getNoOfSqMPerLiter() {
    return noOfSqMPerLiter;
  }

  /*
   * This method calculates the amount of paint required to cover the surface.
   * The result is rounded off upward to the nearest 0.5 liters.
   */
  public double getMaterialReq(Surface aSurface) {
    double area = aSurface.getArea();
    double noOfLiters = area * noOfCoats / noOfSqMPerLiter;
    int noOfLitersInteger = (int) noOfLiters;
    double more = noOfLiters - noOfLitersInteger;
    if (more >= 0.5 + limit) return noOfLitersInteger + 1.0;
    else if (more >= limit) return noOfLitersInteger + 0.5;
    else return noOfLitersInteger;
  }
  
  public String toString() {
    return super.toString() + ", no. of coats: " + noOfCoats + ", no. of sqm/liter: "
                            + decimalFormat.format(noOfSqMPerLiter);
  }
}