我正在尝试编写一个程序，到目前为止的其余代码都可以工作，但是我发现了一个不兼容的类型：双重要求：第 38 行的杂货项目。谁能帮我解释为什么我收到这个错误以及如何正确吗？谢谢你。这是我的代码：
import java.util.Scanner;
public class GroceryList {
private GroceryItem[]groceryArr; //ARRAY HOLDS GROCERY ITEM OBJECTS
private int numItems;
private String date;
private String storeName;
public GroceryList(String inputDate, String inputName) {
//FILL IN CODE HERE
// CREATE ARRAY, INITIALIZE FIELDS
groceryArr = new GroceryItem[10];
numItems = 0;
}
public void load() {
Scanner keyboard = new Scanner(System.in);
double sum = 0;
System.out.println ("Enter the trip date and then hit return:");
date = keyboard.next();
keyboard.nextLine();
System.out.println("Enter the store name and then hit return:");
storeName = keyboard.next();
keyboard.nextLine();
double number = keyboard.nextDouble();
//NEED TO PROMPT USER FOR, AND READ IN THE DATE AND STORE NAME.
System.out.println("Enter each item bought and the price (then return).");
System.out.println("Terminate with an item with a negative price.");
number = keyboard.nextDouble();
while (number >= 0 && numItems < groceryArr.length) {
groceryArr[numItems] = number;
numItems++;
sum += number;
System.out.println("Enter each item bought and the price (then return).");
System.out.println("Terminate with an item with a negative price.");
number = keyboard.nextDouble();
}
/*
//READ IN AND STORE EACH ITEM. STORE NUMBER OF ITEMS
}
private GroceryItem computeTotalCost() {
//add code here
}
public void print() {
\\call computeTOtalCost
}
*/
}
}