Error: cannot find symbol ArrayList

Question

I'm trying to create some kind of list to store values from the array 'table'. (I'm using a arraylist here, but should I be using a list instead?) However, every time I try to compile, it throws the following error:

cannot find symbol symbol : class ArrayList location: class players.TablePlayer

The code is below.

public class TablePlayer extends Player { int[][] table; ArrayList goodMoves; public TablePlayer(String name) { super(name); } @Override public int move() { int oppLast = opponentLastMove(); int myLast = myLastMove(); if (!isLegalMove(oppLast)) { return 0; // temporary } if (wonLast()) { table[oppLast][myLast] = 1; table[myLast][oppLast] = -1; } if ((wonLast() == false) && (oppLast != myLast)) { table[oppLast][myLast] = -1; table[myLast][oppLast] = 1; } for (int i = 0; i < table.length; i++) { for (int j = 0; j < table.length; j++) { if (table[i][j] == 1) { goodMoves.add(table[i][j]); } } } return oppLast; // temporary } @Override public void start() { int[][] table = new int[7][7]; ArrayList<int> goodMoves = new ArrayList<int>(); } }

Any help would be great, thanks!

Sounds like you're just missing the import.

Henry Keiter
– Henry Keiter

2013-04-03 13:57:23 +00:00
Commented Apr 3, 2013 at 13:57 — Henry Keiter
– Henry Keiter, Commented Apr 3, 2013 at 13:57
A decent Java IDE would help you with that.

maba
– maba

2013-04-03 14:10:05 +00:00
Commented Apr 3, 2013 at 14:10 — maba
– maba, Commented Apr 3, 2013 at 14:10

mrks · Accepted Answer · 2013-04-03 13:56:37Z

35

Do you have an import statement in the top of the file?

import java.util.ArrayList;

answered Apr 3, 2013 at 13:56

mrks

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3 Comments

csstudent Over a year ago

Thanks, that solved the errors, but it's thrown a new error. warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.ArrayList

BambooleanLogic Over a year ago

Using an ArrayList<Integer> instead of an ArrayList should remove that warning.

csstudent Over a year ago

I added in the 'Integer' generic, but still throwing the same error.

Shubham Teke · Accepted Answer · 2020-09-17 05:43:28Z

While doing any java program just

import java.util.*;

Because * will import all the packages from util.

And all the basic package are present in that java.util like Scanner, ArrayList, etc...

So to avoid errors first check you have imported that.

Ahmed Ashour · Accepted Answer · 2019-03-20 15:46:59Z

Before use a class, you need to import it into you class file definition.

Add it on top of your file:

import java.util.ArrayList;

For more info about imports, look it up here

It is recommended to learn how to use a IDE, like Eclipse, Netbeans. It will help you with these common mistakes when we are programming in Java (in this case) outside a integrated environment.

Yeah, I'm trying using Dr. Java right now, but having some trouble with it.
I recommend Eclipse IDE. Try some tutorial to start things up.

General Grievance · Accepted Answer · 2022-08-03 14:19:38Z

-4

I am new to the community and on a path of learning now. But I think the main problem is of int

Wrong

ArrayList <int> goodMoves = new ArrayList <int>();

Right

ArrayList <Integer> goodMoves = new ArrayList <Integer>();

edited Aug 3, 2022 at 14:19

General Grievance

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answered Aug 1, 2022 at 12:41

Aditya Singh

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1 Comment

General Grievance Over a year ago

This is an error ("unexpected type"), but it is not the reason for the error "cannot find symbol".

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