material.java

来自「Java the UML Way 书中所有源码」· Java 代码 · 共 36 行

/*
 * Material.java   E.L. 2001-08-17
 *
 */
import java.text.*; 
abstract class Material {
  private String name;  // identifies the material
  private double price; // price per unit
  
  /* These two formats are used in toString() methods */
  protected static final DecimalFormat decimalFormat = new DecimalFormat("####0.00");
  protected static final NumberFormat currencyFormat = NumberFormat.getCurrencyInstance();

  public Material(String initName, double initPrice) {
    name = initName;
    price = initPrice;
  }

  public String getName() {
    return name;
  }

  public double getPricePerUnit() {
    return price;
  }

  public double getTotalPrice(Surface aSurface) {
    return getMaterialReq(aSurface) * price;
  }

  public abstract double getMaterialReq(Surface aSurface);
  
  public String toString() {
    return getClass().getName() + ": " + name + ", price " + currencyFormat.format(price);
  }
}