Java JCreator List 引用 ArrayList 不起作用？

Question

您好，我一直在尝试使用以下代码使用 List 引用来引用 ArrayList:

import java.util.List;

public class Purse 
{
    private List<String> purseList;
    public static final String EMPTY_STRING = "";

    // constructs an ArrayList of Strings
    public Purse()
    {
        purseList = new ArrayList<String>();
    }

这给了我错误

"Purse.java:14: error: cannot find symbol
        purseList = new ArrayList<String>();
                        ^
  symbol:   class ArrayList
  location: class Purse
1 error"

但是当我使用这套代码时没有问题，我该怎么办才能使用List而不是ArrayList

import java.util.ArrayList;

public class Purse 
{
    private ArrayList<String> purseList;
    public static final String EMPTY_STRING = "";

    // constructs an ArrayList of Strings
    public Purse()
    {
        purseList = new ArrayList<String>();
    }

Answer 1

您可以同时导入 List 和 ArrayList!

import java.util.ArrayList;
import java.util.List;

public class Purse 
{
    private List<String> purseList;
    public static final String EMPTY_STRING = "";

    // constructs an ArrayList of Strings
    public Purse()
    {
        purseList = new ArrayList<String>();
    }
}