Java JCreator列表引用到引用ArrayList不工作?
您好,我一直在尝试使用列表引用来引用ArrayList,代码如下:Java JCreator列表引用到引用ArrayList不工作?,java,arraylist,Java,Arraylist,您好,我一直在尝试使用列表引用来引用ArrayList,代码如下: import java.util.List; public class Purse { private List<String> purseList; public static final String EMPTY_STRING = ""; // constructs an ArrayList of Strings public Purse() { pu
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>();
}
import java.util.List;
公款钱包
{
私人名单;
公共静态最终字符串为空_String=“”;
//构造字符串的ArrayList
公帑
{
purseList=newarraylist();
}
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"
“钱包.java:14:错误:找不到符号
purseList=newarraylist();
^
符号:类ArrayList
地点:班级钱包
1错误“
但是,当我使用这组代码时,没有问题,我该如何使用List而不是ArrayList呢
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>();
}
import java.util.ArrayList;
公款钱包
{
私人ArrayList purseList;
公共静态最终字符串为空_String=“”;
//构造字符串的ArrayList
公帑
{
purseList=newarraylist();
}
您可以同时导入列表
和阵列列表
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>();
}
}
import java.util.ArrayList;
导入java.util.List;
公款钱包
{
私人名单;
公共静态最终字符串为空_String=“”;
//构造字符串的ArrayList
公帑
{
purseList=newarraylist();
}
}