库存程序修改问题第4部分

Question

我尝试修改我的代码以添加 GUI，不确定我是否正确执行此操作并收到 1 条错误消息，如下所示：

C:\Documents and Settings\AdminUser\My Documents\InventoryPart4.java:40: invalid method declaration; return type required
public Television(String itemNumber, String televisionName, int unitsinStock, double unitPrice) {

^ 1 错误

工具已完成，退出代码 1

如果有人可以查看下面的代码，请告诉我是否按照这些说明正确完成了修改。GUI 应该显示库存中的所有物品，并包括物品编号、物品名称产品、库存单位数量、每个单位的价格以及该产品的库存价值。此外，GUI 应显示整个库存的价值、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）。 DOS 控制台中不应有任何输出。 我真的很努力地想要掌握这一切，但如果我做得对的话，我会感到非常困惑和沮丧。特别是因为我不确定如何修复该错误。如果有人能在晚一天的情况下给我一些意见，并且还有 2 个零件很快就要到期，我将不胜感激。

enter code here

// 第 7 周库存计划第 4 部分 //在Television类中存储数据的库存程序 // 使用GUI返回数据 // 添加子类大小

import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JOptionPane;
import javax.swing.JLabel;




@SuppressWarnings("serial")
public class Televisions extends JFrame { //class name and attributes

    //declare class variables
    private String itemNumber; //item # of product
    private String televisionName; //product name
    public int unitsinStock; //# of units in stock
    public double unitPrice; //Price per unit

       NumberFormat nf = NumberFormat.getCurrencyInstance(Locale.US);

   //class constructor

  public Television(String itemNumber, String televisionName, int unitsinStock, double unitPrice) {
      this.itemNumber = itemNumber;
      this.televisionName = televisionName;
      this.unitsinStock = unitsinStock;
      this.unitPrice = unitPrice;

}   //end constructor

   //define set and get methods for class variables
   //getter and setter methods for Television

   //item number
public String getItemNumber() { //getter for item number
    return itemNumber;
} //end getter item number

public void setItemNumber (String itemNumber) { //setter for item number
    this.itemNumber = itemNumber;
} //end setter item number

//television name
public String getTelevisionName() { //getter for product name
        return televisionName;
} //end getter television name

public void setTelevisionName (String product) { //setter for product name
    this.televisionName = televisionName;
} //end setter television name

 //available units
public double getUnitsInStock() { //getter for units in stock
        return unitsinStock;
} //end getter units in stock

public void setUnitsInStock (double units) { //setter for units in stock
    this.unitsinStock = unitsinStock;
} //end setter units in stock

 //price
public double getUnitPrice() { //getter for unit price
        return unitPrice;
} //end getter for unit price

public void setUnitPrice (double price) { //setter for unit price
    this.unitPrice = unitPrice;
} //end setter unit price


 //calculate the total inventory by returning the product of available units and price
public double calculateInventory(){
    return unitPrice * unitsinStock;
}

//toString method that outputs the class variables
public String toString () {
        return "Television Name:" + "\t" + televisionName + "\n" +
               "Item Number:" + "\t" + itemNumber + "\n" +
               "UnitsInStock:" + "\t \t" + unitsinStock + "\n" +
               "UnitPrice:" + "\t \t" + nf.format(unitPrice) + "\n" +
               "Item Total:" + "\t" + nf.format(calculateInventory());
               }

}

Answer 1

对于任何人来说，代码太多了，无法阅读，但我可以告诉您，错误消息告诉您类 Televisions 的名称与名称不匹配您用于构造函数 Television。这些显然必须匹配！