cartapp.java

购物车模块实例。购物车模块可以浏览商品类别；可以根据商品类别浏览商品信息；可以购买商品；可以查看购物车的商品；可以修改购买商品的数量和删除购买的商品。

package cartinterface;

import javax.swing.UIManager;
import java.awt.*;
import data.Cart;

public class CartApp {
  Cart cart = new Cart();

  public CartApp() {
    //设置顾客的名字
    cart.setCustomer("customer");
    //创建窗口类
    CartFrame frame = new CartFrame(cart);
    //分别取得屏幕和窗口的大小
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = frame.getSize();
    if (frameSize.height > screenSize.height) {
      frameSize.height = screenSize.height;
    }
    if (frameSize.width > screenSize.width) {
      frameSize.width = screenSize.width;
    }
    //使窗口居中对齐
    frame.setLocation((screenSize.width - frameSize.width) / 2,
                      (screenSize.height - frameSize.height) / 2);
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new CartApp();
  }
}