在 InventoryPart 2 程序上工作的 Java 代码，不知道我做错了什么？

Question

我收到以下错误代码：

C:\Documents and Settings\AdminUser\My Documents\InventoryPart2.java:83：需要类、接口或枚举
导入 java.util.*;
^
1 个错误

工具已完成，退出代码为 1

编译这些源文件时出现

public class Television { //class name and attributes

    private String ItemNumber; //item # of product
    private String ProductName; //product name
    private double UnitsStock; //# of units in stock
    private double UnitPrice; //Price per unit
    private double InventoryValue; //The dollar value of the inventory in stock
    private double CalculateInventory; //The total value of all of the inventory in stock
    private double value;

    //constructor
    public Television (String item, String product, double units, double price) {
        ItemNumber = item;
        ProductName = product;
        UnitsStock = units;
        UnitPrice = price;
    } //end constructor

    //getter and setter methods for Television

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

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

    public void setProductName (String product) { //setter for product name
        this.ProductName = product;
    } //end setter product name

    public String getProductName() { //getter for product name
        return ProductName;
    } //end getter product name

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

    public double getUnitsStock() { //getter for units in stock
        return UnitsStock;
    } //end getter units in stock

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

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

    //calculate inventory value
    public double getInventoryValue(){
        return UnitsStock * UnitPrice;
    }//end calculate inventory value

    public void setCalculateInventory (double value){
        this.CalculateInventory = value;
    }

    public double getCalculateInventory(){
        double value = 0;
        for(int i = 0; i < 5; i++){
            value = getInventoryValue();
        }
        return value;
    }
    //end getter and setter methods for Television
} //end class Television

：主类：

import java.util.*;

public class InventoryPart2 {

    public static void main (String args []){

        //instantiate Television array

        Television myTelevisions[] = new Television[5];

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

        //output
        for (int i = 0; i < myTelevisions.length; i++){
            System.out.println("Product Number: \t\t" + myTelevisions[i].getItemNumber());
            System.out.println("Product Name: \t\t\t" + myTelevisions[i].getProductName());
            System.out.println("Number of Units in Stock: \t" + myTelevisions[i].getUnitsStock());
            System.out.printf("Price per Unit: \t\t$%.2f\n", + myTelevisions[i].getUnitPrice());
            System.out.printf("Value of Inventory: \t\t$%.2f\n", + myTelevisions[i].getInventoryValue());
            System.out.println();
        } // end output

        for (int i = 0; i < 5; i++){ //output total inventory value
            System.out.printf("Total Value of Inventory is: \t$%.2f\n", + myTelevision[i].getCalculateInventory());
            System.out.println();
        }//end output total inventory value
    } //end method main
} //end class InventoryPart1

Answer 1

正如 @Greg 和 @EboMike 所说，请确保将代码拆分为两个文件：Television.java 和 InventoryPart2.java。

那么，这里有一个拼写错误：

for (int i = 0; i < 5; i++){ //output total inventory value
    System.out.printf("Total Value of Inventory is: \t$%.2f\n", + myTelevision[i].getCalculateInventory());
    System.out.println();
}

这是 myTelevision s[i]。

如果你解决了我告诉你的问题，你的代码就可以正常运行......不用担心。 :)

编辑：

我不应该在这里检查代码的逻辑，但如果最后一个周期是为了计算总库存总和，那么它应该是这样的：

    //output total inventory value
    double total = 0.0;
    for (int i = 0; i < 5; i++){ 
        total +=  myTelevisions[i].getCalculateInventory();            
    }
    System.out.printf("Total Value of Inventory is: \t$%.2f\n", total);

Answer 2

这都是同一个文件吗？ import 语句需要位于顶部。

错误消息清楚地显示了哪一行导致了问题。

Answer 3

有一行

import java.util.*;

文件中间 。 Java 要求 import 声明位于文件的顶部，位于任何 class、interface 或 之前>enum 声明。

Answer 4

我突然想到两个问题：

1. 正如错误消息所示，您的导入语句不合适。导入位于顶部，位于包声明之后和类声明之前。

2. 假设您发布的代码实际上全部在一个文件中，您需要将其分成两个文件。一个 .java 文件中不能有两个公共类。