cannot find symbol , location:class ArrayList import javax.servlet.http.*; import javax.servlet.*; import java.io.*; import java.util.*; import java.lang.String; public class MsgServlet extends HttpServlet { /* MIDlets' ID list */ private ArrayList idList = new ArrayList(); /* ...
Also, if it is possible, is it ok to refer to the ArrayList using adam.hand.add(blah) etc? Here's my GamePlay class: import java.util.List; import java.util.ArrayList; public class GamePlay { public static void main(String[] args) { Card[] pack = new Card[52]; for(int i = 0...
import java.util.ArrayList; import java.util.Collections; public class Program { public static void main(String[] args) { ArrayList<Integer> list = new ArrayList<Integer>(); list.add(4); list.add(2); list.add(3); list.remove(2); Collections.sort(list); System.out.println(list.get(0...
public final List<Supplier<EntityType>> entities = new ArrayList<>(); ^ symbol: class EntityType location: class MoreStorageModElements C:\Users\Administrator\MCreatorWorkspaces\more_storage\src\main\java\net\mcreator\morestorage\MoreStorageModElements.java:30: error: cannot find symbol public fina...
MainProgram.java:12: error cannot find symbol ArrayList<Flashcard> deckEntire = new ArrayList<Flashcard>(); symbol: class Flashcard location: class MainProgram MainProgram.java:15: error cannot find symbol Flashcard FC = new Flashcard(); The arrow in both error messages is pointing to...
在Java中,当你试图将一个类型的对象强制转换为不兼容的类型时,就会抛出java.lang.ClassCastException异常。在你的情况下,你试图将ArrayList强制转换为Map,这是不允许的。为了解决这个问题,你需要确保你正在操作的对象是正确的类型。以下是几种解决此问题的有效方法:方法一:检查对象类型在将对象转换为另一种类型之前,...
java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.util.LinkedList 这个错误表明你尝试将一个 ArrayList 对象转换为 LinkedList 对象,但实际上它们是不兼容的。在 Java 中,类型转换只能在具有直接继承关系的类之间进行。虽然 ArrayList 和 LinkedList 都实现了 List 接口,但它们是两个不同的...
at AddressBookPrimer.main(AddressBookPrimer.java:21) 如果articles返回的不是 null,而是一个空数组的话,那么这个代码就报错了,所以需要修改下:数组不能只判空,还需要判断size() >0 二、问题分析 ArrayList#get,set和remove首先调用rangeCheck方法。此方法不检查索引是否为负数,它只检查索引是否大于或等于数组的长度...
SeaTunnelConfigUtil.java#L36 the full stack: 1. https://github.com/apache/seatunnel-web/blob/1.0.0-release/seatunnel-server/seatunnel-app/src/main/java/org/apache/seatunnel/app/service/impl/JobExecutorServiceImpl.java#L66 2. https://github.com/apache/seatunnel-web/blob/1.0.0-release/sea...
这个报红,并显示错误:String() in String cannot be applied to (byte[]) 1、问题原因:引入错了String的包,查看import中导入的是 import com.sun.org.apache.xpath.internal.operations.String; 1. 2、解决方法:删掉,改用 java.lang.string 包即可