java - 修改库存程序以使用 GUI

Question

GUI 应显示库存中的所有商品，并包括商品编号、产品名称、库存单位数量、每个单位的价格以及该产品的库存值(value)。此外，GUI 应显示整个库存的值(value)、附加属性和补货费用。所有美元值均应显示为货币(即 $D,DDD.CC)。

当我编译代码时，我收到以下错误消息，我不知道如何纠正。

C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:162: class, interface, or enum expected
import java.awt.BorderLayout;
^
C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:163: class, interface, or enum expected
import java.awt.FlowLayout;
^
C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:164: class, interface, or enum expected
import java.awt.GridLayout;
^
C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:165: class, interface, or enum expected
import java.awt.event.ActionEvent;
^
C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:166: class, interface, or enum expected
import java.awt.event.ActionListener;
^
C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:167: class, interface, or enum expected
import java.text.DecimalFormat;
^
C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:169: class, interface, or enum expected
import javax.swing.BorderFactory;
^
C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:170: class, interface, or enum expected
import javax.swing.JButton;
^
C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:171: class, interface, or enum expected
import javax.swing.JFrame;
^
C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:172: class, interface, or enum expected
import javax.swing.JLabel;
^
C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:173: class, interface, or enum expected
import javax.swing.JPanel;
^
C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:174: class, interface, or enum expected
import javax.swing.JTextField;
^
12 errors

Tool completed with exit code 1

这是我的代码:

/**
 * Represents a product.
 */
public class Television {
    private int itemNumber;
    private String productName;
    private int unitsInStock;
    private double price;

    /**
     * Default constructor
     */
    public Television() {
    }

    /**
     * Handy constructor to initialize all attributes of the product.
     */
    public Television(int itemNumber, String productName, int unitsInStock,
            double price) {
        this.itemNumber = itemNumber;
        this.productName = productName;
        this.unitsInStock = unitsInStock;
        this.price = price;
    }

    /**
     * @return The value of the inventory (the number of units in stock
     *         multiplied by the price of each unit).
     */
    public double calculateInventory() {
        return this.unitsInStock * this.price;
    }

    /**
     * @return the itemNumber
     */
    public int getItemNumber() {
        return itemNumber;
    }

    /**
     * @return the product name
     */
    public String getProductName() {
        return productName;
    }

    /**
     * @return the unitsInStock
     */
    public int getUnitsInStock() {
        return unitsInStock;
    }

    /**
     * @return the price
     */
    public double getPrice() {
        return price;
    }

    /**
     * @param itemNumber
     *            the itemNumber to set
     */
    public void setItemNumber(int itemNumber) {
        this.itemNumber = itemNumber;
    }

    /**
     * @param name
     *            the product name to set
     */
    public void setName(String productName) {
        this.productName = productName;
    }

    /**
     * @param unitsInStock
     *            the unitsInStock to set
     */
    public void setUnitsInStock(int unitsInStock) {
        this.unitsInStock = unitsInStock;
    }

    /**
     * @param price
     *            the price to set
     */
    public void setPrice(double price) {
        this.price = price;
    }
}


/**
 * This class should inherit from the Product class. Recall that the extends
 * keyword is used in java to represent inheritance
 */
public class Supplier extends Computer {
    /** Supplier Name */
    private String supplierName;

    /**
     * Constructor should have 5 parameters:
     *
     * - Item Number
     *
     * - Product Name
     *
     * - Number of Units in Stock
     *
     * - Price of each Unit
     *
     * - Supplier Name
     */
    public Supplier(int itemNumber, String productName, int unitsInStock,
            double price, String supplierName) {
        /*
         * Note you will use the super keyword to invoke the constructor in your
         * Product class.
         */
        super(itemNumber, productName, unitsInStock, price);
        this.supplierName = supplierName;
    }

    /**
     * This method returns the product of price and available units multiplied
     * by 5% ((price * product) * .05);
     */
    public double calculateRestockFee() {
        return super.calculateInventory() * .05;
    }

    /**
     * This method returns the product of price and available units plus the
     * restock fee.
     */
    public double calculateInventory() {
        return super.calculateInventory() + calculateRestockFee();
    }

    /**
     * @return the supplierName
     */
    public String getSupplierName() {
        return supplierName;
    }

    /**
     * @param supplierName
     *            the supplierName to set
     */
    public void setSupplierName(String supplierName) {
        this.supplierName = supplierName;
    }

}


import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

@SuppressWarnings("serial")
public class InventoryPart4 extends JFrame {
    private static DecimalFormat currency = new DecimalFormat("$#,##0.00");

    // Declares the TextFields used to display the value of each attribute of
    // the current product.
    private JTextField itemNumberTF;
    private JTextField productNameTF;
    private JTextField unitsInStockTF;
    private JTextField priceTF;
    private JTextField supplierNameTF;
    private JTextField restockFeeTF;
    private JTextField valueOfInventoryTF;

    // Declares a TextField to display the value of the entire inventory
    private JTextField totalValueOfInventoryTF;

    // Declare buttons to navigate through the products in the inventory
    private JButton priorBT;
    private JButton nextBT;

    // This array holds all products in the inventory.
    private Supplier[] products;

    // Indicates the index of the product displayed onto the screen.
    private int current = 0;

    /**
     * Starts the application
     *
     * @param args
     *            Not used by this application
     */
    public static void main(String[] args) {
        // Creates and displays the GUI
        new InventoryPart4();
    }

    /**
     * Creates a new instance of the GUI and displays the frame.
     */
    public InventoryPart4() {
        super("Inventory Part 4");
        setSize(500, 300);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);

        // Creates the array with 5 elements
        products = new Supplier[5];

        // Creates some products
        products[0] = new Supplier(0001, " Samsung UN46D6400",9,1599.99);
        products[1] = new Supplier(0002, " Vizio XVT553SV",6,1299.00);
        products[2] = new Supplier(0003, " Panasonic Viera TC-P50VT25",2,2079.99);
        products[3] = new Supplier(0004, " Sony Bravia KDL-55EX720",8, 1889.99);
        products[4] = new Supplier(0005, " LG Infinia 47LX9500",2,2099.00);

        // Sorts products by name
        sortArray();

        // Creates the visual components
        createComponents();

        // Shows the GUI
        setVisible(true);

        // Displays the first product
        updateFields();
    }

    private void createComponents() {
        JPanel p = new JPanel();
        p.setLayout(new BorderLayout());
        p.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

        p.add(createFieldsPanel(), BorderLayout.CENTER);
        p.add(createButtonsPanel(), BorderLayout.SOUTH);

        setContentPane(p);
    }

    private JPanel createButtonsPanel() {
        JPanel p = new JPanel();
        p.setLayout(new FlowLayout(FlowLayout.RIGHT));

        priorBT = new JButton("Prior");
        priorBT.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (current > 0) {
                    current--;
                    updateFields();
                }
            }
        });
        p.add(priorBT);

        nextBT = new JButton("Next");
        nextBT.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (current < products.length - 1) {
                    current++;
                    updateFields();
                }
            }
        });
        p.add(nextBT);

        return p;
    }

    /**
     * Updates the fields to reflect the current product.
     */
    protected void updateFields() {
        Supplier s = products[current];

        itemNumberTF.setText(String.valueOf(s.getItemNumber()));
        productNameTF.setText(s.getProductName());
        unitsInStockTF.setText(String.valueOf(s.getUnitsInStock()));
        priceTF.setText(currency.format(s.getPrice()));
        supplierNameTF.setText(s.getSupplierName());
        restockFeeTF.setText(currency.format(s.calculateRestockFee()));
        valueOfInventoryTF.setText(currency.format(s.calculateInventory()));

        totalValueOfInventoryTF.setText(currency.format(calculateInventory()));
    }

    private JPanel createFieldsPanel() {
        JPanel p = new JPanel();
        p.setLayout(new GridLayout(0, 2, 5, 5));

        p.add(new JLabel("Item Number"));
        itemNumberTF = new JTextField();
        p.add(itemNumberTF);

        p.add(new JLabel("Product Name"));
        productNameTF = new JTextField();
        p.add(productNameTF);

        p.add(new JLabel("Units In Stock"));
        unitsInStockTF = new JTextField();
        p.add(unitsInStockTF);

        p.add(new JLabel("Unit Price"));
        priceTF = new JTextField();
        p.add(priceTF);

        p.add(new JLabel("Supplier Name"));
        supplierNameTF = new JTextField();
        p.add(supplierNameTF);

        p.add(new JLabel("Restock Fee"));
        restockFeeTF = new JTextField();
        p.add(restockFeeTF);

        p.add(new JLabel("Value Of Inventory"));
        valueOfInventoryTF = new JTextField();
        p.add(valueOfInventoryTF);

        p.add(new JLabel(""));
        p.add(new JLabel(""));

        p.add(new JLabel("Value Of The Entire Inventory"));
        totalValueOfInventoryTF = new JTextField();
        p.add(totalValueOfInventoryTF);

        return p;
    }

    /**
     * A method to calculate the value of the entire inventory. This method
     * should take in an array of type Television and should
     * traverse through all the elements of the array and calculate the
     * inventory.
     *
     * @return The value of the entire inventory.
     */
    public double calculateInventory() {
        double value = 0;
        for (int i = 0; i < products.length; i++) {
            value += products[i].calculateInventory();
        }
        return value;
    }

    /**
     * Sorts the products by name, using the Bubble Sort algorithm.

     */
    public void sortArray() {
        int n = products.length; // size;
        boolean swapped;
        do {
            swapped = false;
            for (int i = 0; i < n - 1; i++) {
                String name1 = products[i].getProductName();
                String name2 = products[i + 1].getProductName();
                if (name1.compareToIgnoreCase(name2) > 0) {
                    // swap
                    Supplier temp = products[i];
                    products[i] = products[i + 1];
                    products[i + 1] = temp;
                    swapped = true;
                }
            }
            n = n - 1;
        } while (swapped);
    }
}

Answer 1

看起来您正在尝试在文件中进行导入。导入应该位于文件的顶部。我认为这将解决您遇到的特定错误。