在一个类中，此方法是专门用于从数组列表中删除项目的。
import java.util.Scanner;
import java.util.ArrayList;
import static java.util.Arrays.*;
/************************
* This part enables the user to add an item, remove an item, and view the list.
* Created 17 FEB 2016
************************/
public class Menu
{
public Scanner aryans = new Scanner(System.in);
public String additem1 = "1";
public String removeitem1 = "2";
public String viewlist1 = "3";
public String startISLA = "j";
Item item; // From the Item class
String itemName;
double itemPrice;
int quantity;
UPC upc; // From the UPC class
int universalproductcode;
Location location; // From the Location class
String locations;
ItemList list1 = new ItemList();
String keepShopping = "j";
String continueISLA= "n";
public Menu()
{
Drivingmethod();
}
public void Drivingmethod()
{
System.out.println("Start ISLA (j/n)? "); // input "admin" for full access to the program
String userused = aryans.nextLine();
if(userused.equals(startISLA))
{
System.out.println(" __________________________"); // Menu lines
System.out.println("| 1: Add item |");
System.out.println("| 2: Remove item |");
System.out.println("| 3: View list |");
//System.out.println("| 4: Restart |");
System.out.println("|__________________________|");
System.out.println("> Input selection: ");
String ans1 = aryans.nextLine();
if(ans1.equals(additem1))
{
addItem(); // add an item
}
else
{
if(ans1.equals(removeitem1))
{
removeItem(); // remove an item
}
else
{
if(ans1.equals(viewlist1))
{
viewList(); // view the list
}
else
{
if(ans1 == "4")
{
Drivingmethod(); // returns you two the start.
}
}
}
}
}
}
public void addItem()
{
do
{
System.out.print("> Input item name: ");
aryans.nextLine();
itemName = aryans.nextLine();
System.out.print("> Input item price: ");
itemPrice = aryans.nextDouble();
System.out.print("> Input item quantity: ");
quantity = aryans.nextInt();
System.out.print("> Input item UPC: ");
universalproductcode = aryans.nextInt();
System.out.print("> Input item location: ");
aryans.nextLine();
locations = aryans.nextLine(); // I was getting issues with this line, but this new way of setting the string fixed it. Applied this alternative to "itemName".
list1.addToList(itemName, itemPrice, quantity, universalproductcode, locations);
System.out.print("> Add another item (j/n)? ");
keepShopping = aryans.nextLine();
}
while (keepShopping.equalsIgnoreCase("j"));
if (keepShopping.equalsIgnoreCase("n"))
{
Drivingmethod();
}
}
public void removeItem()
{
System.out.println(list1);
System.out.println("Input the number of items you wish to remove: ");
int Q = 1;
int removenumberitems = aryans.nextInt();
while(Q <= removenumberitems)
{
System.out.print("Input the numerical location of the item: ");
int index1 = aryans.nextInt();
list1.remove(index1);
System.out.println(list1.get(index1) + " was successfully removed from the list.");
Q++;
}
}
public void viewList()
{
System.out.println(list1);
System.out.println("Would you like to end ISLA (j/n)?");
if (continueISLA.equalsIgnoreCase("n"))
{
Drivingmethod();
}
}
}
然而，在编译时，我BlueJ突出显示＆＃34;删除＆＃34;在行＆＃34; list1.remove（index1）;＆＃34;作为一个错误，说明＆＃34;找不到符号 - 方法remove（int）＆＃34;。
导致此问题的原因是什么？我如何在我的代码中修复它？