Java 找不到ArrayList对象
NumberTile类为数字磁贴建模，数字磁贴是一个由4个整数组成的数组列表，Java 找不到ArrayList对象,java,arraylist,Java,Arraylist,NumberTile类为数字磁贴建模，数字磁贴是一个由4个整数组成的数组列表，TileGame类将一个磁贴插入到棋盘中，测试类开始游戏。一只手是一个包含5个NumberTile的数组列表，但是当我编译它时，每次我在TileGame中引用一个包含NumberTile的数组列表时，它都找不到符号NumberTile 我是否需要创建一个包以便它能够识别它？我的导师提供了大部分的陈述，我不能改变它们。我没有键入其他方法，因为我认为它们不是必需的 另外，行TileGame game=new TileGam
TileGameNumberTileTileGameNumberTile我是否需要创建一个包以便它能够识别它？我的导师提供了大部分的陈述，我不能改变它们。我没有键入其他方法，因为我认为它们不是必需的 另外，行
TileGame game=new TileGame（）表示找不到符号。初始化它的正确方法是什么
我需要任何能得到的帮助。多谢各位
ClassTileGame
：
public class TileGame
{
//provided by instructor
private ArrayList<NumberTile> board ;
// Creates an empty board
public TileGame()
{
//do not modify this method
board = new ArrayList<NumberTile>();
}
// Accessor for the board
public ArrayList<NumberTile> getBoard()
{
// Do not modify this method
return board ;
}
// Creates and returns a hand of 5 random number tiles
public ArrayList<NumberTile> getHand()
{
ArrayList<NumberTile> hand = new ArrayList<NumberTile>() ;
for (int a = 0; a < 5; a++)
{
hand.add(a, new NumberTile());
}
return hand;
}
// If the current tile fits in the board (without rotating) then
// return the index i of a tile in the board so that the current tile
// fits before ti for i = 0..k-1, or return k if the current tile fits
// after the last tile. If the tile does not fit, return -1
public int getIndexForFit(NumberTile currentTile)
{
NumberTile firstTile = board.get(0);
NumberTile lastTile = board.get(board.size() - 1);
if(firstTile.getLeft() == currentTile.getRight())
{
return 0;
}
else if (lastTile.getRight() == currentTile.getLeft())
{
return board.size() - 1;
}
else
{
return -1 ;
}
}
// Call the method getIndexForFit to see whether a tile can be inserted
// into the board. In this method the tile can be rotated. If the tile
// can be inserted, return true. If the tile does not fit after
// rotating (at most 3 times), return false.
public boolean canInsertTile(NumberTile currentTile)
{
//call get index for fit
int canInsert = getIndexForFit(currentTile);
boolean canInsertOrNot = false;;
//if true, modify index
if(canInsert == -1)
{
//rotate
for (int rotations = 0; rotations < 3; rotations++)
{
currentTile.rotate();
int didRotationWork = getIndexForFit(currentTile);
if (didRotationWork == -1)
{
continue;
}
else if (didRotationWork != -1)
{
canInsertOrNot = true;
}
}
return false;
}
else if(canInsert != -1)
{
return true;
}
return canInsertOrNot;
}
// Make a move. I.e. if a tile in the hand fits on the board
// then remove it from the hand and place it in the board. If no tile
// from the hand fits, then add another tile to the hand
public void makeMove(ArrayList<NumberTile> hand)
{
boolean fits;
for (int x = 0; x < hand.size(); x++)
{
//call caninterserttile
fits = canInsertTile(hand.get(x));
if(fits)
{
int index = getIndexForFit(hand.get(x));
board.add(index, hand.get(x));
hand.remove(x);
break;
}
else
{
hand.add(hand.size() -1, new NumberTile());
}
}
}
public String toString()
{
// Do not modify this method
return board.toString() ; // ArrayList as a String
}
} // end of TileGame class
public class NumberTile
{
public ArrayList<Integer> tile = new ArrayList<>();
// Constructs a NumberTile object using 4 random integers in the
// range 1 to 9
public NumberTile()
{
Random generator = new Random() ;
for (int a = 0; a < 4; a++)
{
int random = generator.nextInt(9);
tile.add(a, random);
}
}
// Rotate the tile 90 degrees
public void rotate()
{
int temp = tile.get(0);
tile.set(0, tile.get(1));
tile.set(1, tile.get(3));
tile.set(3, tile.get(2));
tile.set(2, temp);
}
public int getLeft()
{
// Do not modify this method
return tile.get(0) ;
}
public int getRight()
{
// Do not modify this method
return tile.get(2) ;
}
public String toString()
{
String out = "";
out += " "+tile.get(0)+" ";
out += tile.get(1) + " " + tile.get(2);
out += " "+tile.get(3)+" ";
return out;
}
} // end of NumberTile class
public class TileGameTester {
public static void main(String[] args){
TileGame game = new TileGame();
boolean winner = false;
//get two hands
ArrayList<NumberTile> hand1 = game.getHand();
ArrayList<NumberTile> hand2 = game.getHand();
//create an empty board
System.out.println(game.getBoard());
do{
//make moves
game.makeMove(hand1);
game.makeMove(hand2);
//check if they won
if (hand1.isEmpty() || hand2.isEmpty())
{
winner = true;
}
}while(!winner);
hand1.toString();
hand2.toString();
if (hand1.isEmpty() && hand2.isEmpty())
{
System.out.println("It is a tie!");
}
else if (hand1.isEmpty())
{
System.out.println("Player 1 won!");
}
else if (hand2.isEmpty())
System.out.println("Player 2 won!");
}
}
ClassTileGameTester
：
public class TileGame
{
//provided by instructor
private ArrayList<NumberTile> board ;
// Creates an empty board
public TileGame()
{
//do not modify this method
board = new ArrayList<NumberTile>();
}
// Accessor for the board
public ArrayList<NumberTile> getBoard()
{
// Do not modify this method
return board ;
}
// Creates and returns a hand of 5 random number tiles
public ArrayList<NumberTile> getHand()
{
ArrayList<NumberTile> hand = new ArrayList<NumberTile>() ;
for (int a = 0; a < 5; a++)
{
hand.add(a, new NumberTile());
}
return hand;
}
// If the current tile fits in the board (without rotating) then
// return the index i of a tile in the board so that the current tile
// fits before ti for i = 0..k-1, or return k if the current tile fits
// after the last tile. If the tile does not fit, return -1
public int getIndexForFit(NumberTile currentTile)
{
NumberTile firstTile = board.get(0);
NumberTile lastTile = board.get(board.size() - 1);
if(firstTile.getLeft() == currentTile.getRight())
{
return 0;
}
else if (lastTile.getRight() == currentTile.getLeft())
{
return board.size() - 1;
}
else
{
return -1 ;
}
}
// Call the method getIndexForFit to see whether a tile can be inserted
// into the board. In this method the tile can be rotated. If the tile
// can be inserted, return true. If the tile does not fit after
// rotating (at most 3 times), return false.
public boolean canInsertTile(NumberTile currentTile)
{
//call get index for fit
int canInsert = getIndexForFit(currentTile);
boolean canInsertOrNot = false;;
//if true, modify index
if(canInsert == -1)
{
//rotate
for (int rotations = 0; rotations < 3; rotations++)
{
currentTile.rotate();
int didRotationWork = getIndexForFit(currentTile);
if (didRotationWork == -1)
{
continue;
}
else if (didRotationWork != -1)
{
canInsertOrNot = true;
}
}
return false;
}
else if(canInsert != -1)
{
return true;
}
return canInsertOrNot;
}
// Make a move. I.e. if a tile in the hand fits on the board
// then remove it from the hand and place it in the board. If no tile
// from the hand fits, then add another tile to the hand
public void makeMove(ArrayList<NumberTile> hand)
{
boolean fits;
for (int x = 0; x < hand.size(); x++)
{
//call caninterserttile
fits = canInsertTile(hand.get(x));
if(fits)
{
int index = getIndexForFit(hand.get(x));
board.add(index, hand.get(x));
hand.remove(x);
break;
}
else
{
hand.add(hand.size() -1, new NumberTile());
}
}
}
public String toString()
{
// Do not modify this method
return board.toString() ; // ArrayList as a String
}
} // end of TileGame class
public class NumberTile
{
public ArrayList<Integer> tile = new ArrayList<>();
// Constructs a NumberTile object using 4 random integers in the
// range 1 to 9
public NumberTile()
{
Random generator = new Random() ;
for (int a = 0; a < 4; a++)
{
int random = generator.nextInt(9);
tile.add(a, random);
}
}
// Rotate the tile 90 degrees
public void rotate()
{
int temp = tile.get(0);
tile.set(0, tile.get(1));
tile.set(1, tile.get(3));
tile.set(3, tile.get(2));
tile.set(2, temp);
}
public int getLeft()
{
// Do not modify this method
return tile.get(0) ;
}
public int getRight()
{
// Do not modify this method
return tile.get(2) ;
}
public String toString()
{
String out = "";
out += " "+tile.get(0)+" ";
out += tile.get(1) + " " + tile.get(2);
out += " "+tile.get(3)+" ";
return out;
}
} // end of NumberTile class
public class TileGameTester {
public static void main(String[] args){
TileGame game = new TileGame();
boolean winner = false;
//get two hands
ArrayList<NumberTile> hand1 = game.getHand();
ArrayList<NumberTile> hand2 = game.getHand();
//create an empty board
System.out.println(game.getBoard());
do{
//make moves
game.makeMove(hand1);
game.makeMove(hand2);
//check if they won
if (hand1.isEmpty() || hand2.isEmpty())
{
winner = true;
}
}while(!winner);
hand1.toString();
hand2.toString();
if (hand1.isEmpty() && hand2.isEmpty())
{
System.out.println("It is a tie!");
}
else if (hand1.isEmpty())
{
System.out.println("Player 1 won!");
}
else if (hand2.isEmpty())
System.out.println("Player 2 won!");
}
}
公共类TileGameTester{
公共静态void main（字符串[]args）{
TileGame游戏=新TileGame（）；
布尔赢家=假；
//有两只手
ArrayList hand1=game.getHand（）；
ArrayList hand2=game.getHand（）；
//创建一个空板
System.out.println（game.getBoard（））；
做{
//搬家
makeMove（hand1）；
makeMove（hand2）；
//检查他们是否赢了
if（hand1.isEmpty（）| | hand2.isEmpty（））
{
胜利者=真；
}
}而（！赢家）；
hand1.toString（）；
hand2.toString（）；
if（hand1.isEmpty（）&&hand2.isEmpty（））
{
System.out.println（“这是一个平局！”）；
}
else if（hand1.isEmpty（））
{
System.out.println（“玩家1赢了！”）；
}
else if（hand2.isEmpty（））
System.out.println（“玩家2赢了！”）；
}
}
我认为您可能需要在包声明（如果有）之间插入“import java.util.Random；”和“import java.util.ArrayList；”以及使用这些文件的文件中的类声明。虽然它不完整，所以我不确定是否要将数据添加到arraylist，但是否找到了符号
我也看不到任何导入语句。你导入对象了吗
例如TileGateMeter应该有import->import com.something.TileGame
和import com.something.NumberTile
还要检查TileGame中是否有import语句，以及arraylist之类的常见导入。您可以将TileGame类导入到TileGameTester类，这可能会解决您的问题。手的声明可能是错误的，但我不知道还有什么其他方法来创建它们，因为没有手类。有人告诉我必须使用NumberTile ArrayList，但我不知道这有什么意义。它们在同一个文件夹中吗？是的，它们在同一个文件夹中，包括TileGameter？如果它们都在同一文件夹/包中，则不需要导入它们。如果它是不同的，这将解释找不到符号。此外，TileGameTester底部的支架似乎缺失。不确定这是在这个文件夹中还是在您的实际代码中。TileGameTester也在同一个文件夹中。我的教授说我不需要创建一个包，但它可能有用。它会修复找不到符号错误吗？我在使用它们的文件中有它们。我没有包声明getHand（）和makeMove（）方法在哪里定义？在TileGame类中，我需要创建一个包来执行此操作吗？这可能是个愚蠢的问题，但我对编程还不熟悉