コード例 #1
0
  public void buyItemFromUser(User buyer, User seller, Item currentItem)
        // PRE:  buyer, seller, currentItem must be initialized
        // POST: Purchases item from the store and has stores it into inventory.
      {

    int buyer_balance; // The new balance of the buyer
    int seller_balance; // The new balance of the seller
    String str; // First query
    String str2; // Second query
    String str3; // Third query

    buyer_balance = buyer.getBalance() - currentItem.getPrice();
    seller_balance = seller.getBalance() + currentItem.getPrice();

    if (buyer_balance > 0) // If the buyer wont go negative
    {
      str =
          String.format(
              "Update users set balance = (%d) where user_name = '%s'",
              buyer_balance, buyer.getUserName());

      str2 =
          String.format(
              "Update users set balance = (%d) where user_name = '%s'",
              seller_balance, seller.getUserName());

      str3 =
          String.format(
              "Update items set owner_id = (%d) where item_name = '%s'",
              buyer.getUserId(), currentItem.getItemName());

      updateTables(str, str2, str3);

    } else {
      // Prompt the user with an error
      JOptionPane.showMessageDialog(
          null, "You will go bankrupt if you try buying that, try selling some items.");
    }
  }
コード例 #2
0
  private void drawBalance(Graphics g)
        //  POST: Draws the balance of the current player
      {

    Font font; // Font used to draw balance
    String message; // Message for balance
    Color oldColor; // Sets for color
    int x1; // Upper-left x coordinate
    int y1; // Upper-left y coordinate
    int x2; // Bottom-right x coordinate
    int y2; // Bottom-right y coordinate
    int width; // Width of the dialogue box
    int height; // Height of the dialogue box
    int offset; // Offset so the dialogue box is positioned
    int balance; // Offset so the dialogue box is positioned
    User player; // User value for the player

    player = usersArray[0];

    balance = player.getBalance();
    oldColor = g.getColor();

    x1 = ScaledPoint.scalerToX(0.72);
    y1 = ScaledPoint.scalerToY(0.81);
    x2 = ScaledPoint.scalerToX(0.88);
    y2 = ScaledPoint.scalerToY(0.86);
    width = x2 - x1;
    height = y2 - y1;
    message = "Balance:";
    font = Drawing.getFont(message, width, height, FONTNAME, FONTSTYLE);
    offset = (width - getFontMetrics(font).stringWidth(message)) / 2;
    g.setColor(Color.WHITE);
    g.drawString(message, x1 + offset, y2);

    x1 = ScaledPoint.scalerToX(0.72);
    y1 = ScaledPoint.scalerToY(0.865);
    x2 = ScaledPoint.scalerToX(0.88);
    y2 = ScaledPoint.scalerToY(0.915);

    width = x2 - x1;
    height = y2 - y1;
    message = "$" + Integer.toString(balance);
    font = Drawing.getFont(message, width, height, FONTNAME, FONTSTYLE);
    offset = (width - getFontMetrics(font).stringWidth(message)) / 2;
    g.drawString(message, x1 + offset, y2);

    g.setColor(oldColor);
  }