renovationchap7.java

来自「Java the UML Way 书中所有源码」· Java 代码 · 共 91 行

/*
 * RenovationChap7.java   E.L. 2001-06-19
 *
 */
import javax.swing.JOptionPane;
class ProjectChap7 {
  public static String[] alternatives = {"Wallpaper", "Paint", "Flooring", "Exit"};
  public static final int wallpaper = 0;
  public static final int paint = 1;
  public static final int flooring = 2;
  public static final int exit = 3;
  private ReaderRenovationCase details = new ReaderRenovationCase();

  public void showInstructions() {
    String instruction =
      "The program calculates the price and amount needed to renovate surfaces,\n" +
      "such as floors and walls. First, you are presented a menu where you\n" +
      "choose between materials: wallpaper, paint, or flooring. Then you have to enter\n" +
      "data about the surface and about the chosen material.\n" +
      "The area of the surface, the price and amount of material are then output.\n" +
      "After that you are back into the menu again.\n";

    JOptionPane.showMessageDialog(null, instruction);
  }

  public int doAChoice() {
    return JOptionPane.showOptionDialog(null, "What do you choose:", "Renovation",
      JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null,
      alternatives, alternatives[0]);
  }

  public void carryOutTheRightThing(int option) {
    Surface aSurface = details.readAndInstantiateSurface();
    String result =
      "\nThe area of " + aSurface.getName() + " is: " + aSurface.getArea() + " sq m.\n";
    switch (option) {
      case wallpaper:
        Wallpaper aWallpaper = details.readAndInstantiateWallpaper();
        result += ("You will need " + aWallpaper.getNoOfRolls(aSurface) +
                   " rolls of wallpaper " + aWallpaper.getName() + ", price $" +
                   aWallpaper.getTotalPrice(aSurface));
        break;
      case paint:
        Paint aPaint = details.readAndInstantiatePaint();
        result += ("You will need " + aPaint.getNoOfLiters(aSurface) + " liters of paint " +
                 aPaint.getName() + ", price $" + aPaint.getTotalPrice(aSurface));
        break;
      case flooring:
        Flooring aFlooring = details.readAndInstantiateFlooring();
        result += ("You will need " + aFlooring.getNoOfMeters(aSurface) +
                   " meters of flooring " + aFlooring.getName() + ", price $" +
                   aFlooring.getTotalPrice(aSurface));
        break;
      default:
         break;
    }
    JOptionPane.showMessageDialog(null, result);
  }
}

class RenovationChap7 {
  public static void main(String[] args) {
    ProjectChap7 aProject = new ProjectChap7();
    aProject.showInstructions();
    int option = aProject.doAChoice();
    while (option != ProjectChap7.exit) {  // we have to qualify the name exit
      aProject.carryOutTheRightThing(option);
      option = aProject.doAChoice();
    }
    System.exit(0);
  }
}
/* Sample data:

/* Sample data:

Input:
Margaret抯 wall: 7.2 m x 2.35 m,
        Wallpaper Sungold: price $9.50, length: 12.5 m, width: 0.54 m.
Anne抯 wall: 7.2 m x 2.35 m, paint 056789: price $9.90, 3 coats, 10 sq m/l.
John抯 floor: 5 m x 4 m, Flooring Berger XX: price $34.00 , width: 5 m.

Output:
The area of Margaret抯 wall is: 16.92 sq m.
You will need 3 rolls of wallpaper Sungold, price $28.50
The area of Anne抯 wall is: 16.92 sq m.
You will need 5.5 liters of paint 056789, price $54.45
The area of John抯 wall is: 20.0 sq m.
You will need 4.0 meters of flooring Berger XX, price $136.0
*/