错误：无法找到符号的ArrayList

问题描述

我想创建某种列表存储在阵列'表'的值。 （？我使用的ArrayList这里，但我应该用一个列表，而不是），但每次我尝试编译的时候，它引发以下错误：

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:

找不到符号
符号：类的ArrayList
位置：类players.TablePlayer

cannot find symbolsymbol : class ArrayListlocation: class players.TablePlayer

在code如下。

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>();
    }
}

任何帮助将是巨大的，谢谢！

Any help would be great, thanks!

推荐答案

你有没有在文件顶部的import语句？

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

import java.util.ArrayList;

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