java - 尝试提取对象的参数并将其传递给另一个类(不确定标题)

Question

我正在开展一个学校项目，我们正在提供类文件，并被要求制作更多方法，以及以前方法之一的重载版本。据我所知，我已经创建了很好的代码，但我不确定如何将第一个类中的对象的参数告知第二个类。

//Main Class
import SE111aClasses.*;
import SE112aClasses.*;
public class Coursework2
{
    public static void main(String[] args) 
    {
        GUI gui = new GUI();
        MyRobot robby = new MyRobot();
        Room room = new Room(9); //Room 9 has some obstacles
        Picture picture = new Picture(room, robby);

        robby.move();
        picture.draw(room, robby);

        robby.move(4);
        picture.draw(room, robby);
    }
}    

//Side class with functions requiring information from main class
import SE111aClasses.*;
import SE112aClasses.*;
public class MyRobot extends Robot 
{
    public void move(int n)
    {
        GUI gui = new GUI();
        for(int i=0; i<n; i++)
        {
            if (!obstacle_ahead(room)) 
                {
                    move();
                }
            else
                {
                    gui.putText("Cannot move forward, obstacle in the way.");
                }
            }
        }
}

所以，在第一个类中，我有一行“Room room = new Room(9);”。我需要第二个类(class)知道第一个类(class)正在使用第 9 个房间，而不通过函数传递它。例如，我无法通过执行“robby.move(Room room, 4)”来传递它。

有人理解这一点并想提供帮助吗？

房间等级很大，但我将其发布以查看是否有帮助。

package SE111aClasses;

/**
Base Room logic...
*/

public class Room {

    /**
    Creates a 20x20 empty room
    */
    public Room() {
        this(0);
    }

    /**
    Creates a 20x20 room of variable content

    @param identifier the exact room to be loaded
    */
    public Room (final int identifier) {
        grid = new int[size][size];
        init(identifier);
    }

    /**
    Room location (x/y) is made blank ( => WHITE )

    @param x the x coordinate of the grid reference
    @param y the y coordinate of the grid reference
    */
    public void setBlank (final int x, final int y) {
        grid[x][y] = WHITE;
    }

    /**
    Room location (x/y) is set as an unbreakable wall ( => BLACK )

    @param x the x coordinate of the grid reference
    @param y the y coordinate of the grid reference
    */
    public void setWall (final int x, final int y) {
        grid[x][y] = BLACK;
    }

    /**
    Room location (x/y) is set as an obstacle ( => BLUE )

    @param x the x coordinate of the grid reference
    @param y the y coordinate of the grid reference
    */
    public void setObstacle (final int x, final int y) {
        grid[x][y] = BLUE;
    }

    /**
    Room location (x/y) is set as an path ( => YELLOW )

    @param x the x coordinate of the grid reference
    @param y the y coordinate of the grid reference
    */
    public void setPath (final int x, final int y) {
        grid[x][y] = YELLOW;
    }

    /**
    Room location (x/y) is set as a target ( => GREEN )

    @param x the x coordinate of the grid reference
    @param y the y coordinate of the grid reference
    */
    public void setTarget (final int x, final int y) {
        grid[x][y] = GREEN;
    }

    /**
    Room location (x/y) is set to the color specified

    @param x the x coordinate of the grid reference
    @param y the y coordinate of the grid reference
    @param color the color to set the specified location to
    */
    public void setSquare (final int x, final int y, final String color) {
        if (color.compareTo("white")        == 0)   {grid[x][y] = WHITE;}
        else if (color.compareTo("black")   == 0)   {grid[x][y] = BLACK;}
        else if (color.compareTo("blue")    == 0)   {grid[x][y] = BLUE;}
        else if (color.compareTo("yellow")  == 0)   {grid[x][y] = YELLOW;}
        else if (color.compareTo("green")   == 0)   {grid[x][y] = GREEN;}
    }

    /**
    Room location (x/y) is set to the color specified

    @param x the x coordinate of the grid reference
    @param y the y coordinate of the grid reference
    @param color the color to set the specified location to
    */
    public void setSquare (final int x, final int y, final int color) {
        switch (color) {
            case 0:     grid[x][y] = WHITE;
                        break;
            case 1:     grid[x][y] = BLACK;
                        break;
            case 2:     grid[x][y] = BLUE;
                        break;
            case 3:     grid[x][y] = YELLOW;
                        break;
            case 4:     grid[x][y] = GREEN;
                        break;
            default:    break;
        }
    }

    public String toString () {
        StringBuffer state = new StringBuffer(1024);
        for (int x = 0; x < size; x++) {
        for (int y = 0; y < size; y++) {
            state.append(grid[x][y]).append(' ');
        }
        state.append("\n");
    }
    return state.toString();
}

/**
@return the size of the room
*/
protected final int room_size() {
    return size;
}

/**
@return the identity matrix that defines the room
*/
protected final int[][] getGrid() {
    return grid;
}

/**
@param grid the new identity matrix
*/
protected void setGrid (final int[][] grid) {
    this.grid = grid;
    size = grid.length;
}

/**
@return the 'state' (color) of the cell in question
*/
protected int cell_state (final int x, final int y) {
    if (x < 0 || x > room_size() || y < 0 || y > room_size()) {
        return -1;
    }
    return grid[x][y];
}

/**
@return true if the cell directly ahead is an obstacle (BLACK or BLUE square)
*/
protected boolean isObstacle (final int x, final int y) {
    if (grid[x][y] == BLUE || grid[x][y] == BLACK) {
        return true;
    }
    return false;
}

/**
Attempt to load the content of the room from the local filesystem. If the load fails,
create a standard empty room bordered by black walls

@param identifier the room content to be loaded
*/
private void init (final int identifier) {

    for (int x = 0; x < size; x++) {
        for (int y = 0; y < size; y++) {
            if (x == 0 || (x == size - 1) || y == 0 || (y == size - 1))
                grid[x][y] = BLACK;
            else
                grid[x][y] = WHITE;
        }
    }

    switch (identifier) {
    case 1:
        grid[3][3] = 2;
        grid[4][3] = 2;
        grid[5][3] = 2;
        grid[6][3] = 2;
        grid[3][4] = 2;
        grid[5][4] = 4;
        break;

    case 2:
        grid[1][7] = 2;
        grid[2][7] = 2;
        grid[3][7] = 2;
        grid[4][7] = 2;
        grid[4][8] = 2;
        grid[4][9] = 2;
        grid[4][10] = 2;
        grid[9][5] = 2;
        grid[9][6] = 2;
        grid[9][7] = 2;
        grid[9][8] = 2;
        grid[10][8] = 2;
        grid[11][8] = 2;
        grid[12][8] = 2;
        grid[13][8] = 2;
        grid[14][8] = 2;
        grid[10][13] = 2;
        grid[10][12] = 2;
        grid[11][12] = 2;
        grid[12][12] = 2;
        grid[11][13] = 4;
        break;

    case 3:
        grid[1][2] = 2;
        break;

    case 4:
        grid[1][2] = 3;
        grid[1][3] = 3;
        grid[1][4] = 3;
        grid[1][5] = 3;
        grid[1][6] = 3;
        grid[1][7] = 3;
        grid[1][8] = 3;
        grid[2][8] = 3;
        grid[3][8] = 3;
        grid[4][8] = 3;
        grid[5][8] = 3;
        grid[6][8] = 3;
        grid[7][8] = 3;
        grid[8][8] = 3;
        grid[8][7] = 3;
        grid[8][6] = 3;
        grid[8][5] = 3;
        grid[8][4] = 3;
        grid[8][3] = 3;
        grid[8][2] = 3;
        grid[7][2] = 3;
        grid[6][2] = 3;
        grid[5][2] = 3;
        grid[4][2] = 3;
        grid[3][2] = 3;
        grid[3][3] = 3;
        grid[3][4] = 3;
        grid[3][5] = 3;
        grid[4][5] = 3;
        grid[5][5] = 4;
        break;

    case 5:
        grid[1][2] = 3;
        grid[1][3] = 3;
        grid[1][4] = 3;
        grid[2][4] = 3;
        grid[3][4] = 3;
        grid[4][4] = 3;
        grid[5][4] = 3;
        grid[6][4] = 3;
        grid[7][4] = 3;
        grid[8][4] = 3;
        grid[8][5] = 3;
        grid[8][6] = 3;
        grid[8][7] = 3;
        grid[7][7] = 3;
        grid[6][7] = 3;
        grid[6][8] = 3;
        grid[6][9] = 3;
        grid[6][10] = 3;
        grid[6][11] = 3;
        grid[5][11] = 3;
        grid[4][11] = 3;
        grid[4][10] = 3;
        grid[4][9] = 3;
        grid[4][8] = 3;
        grid[3][8] = 3;
        grid[2][8] = 3;
        grid[1][8] = 3;
        grid[1][9] = 3;
        grid[1][10] = 3;
        grid[1][11] = 3;
        grid[1][12] = 3;
        grid[1][13] = 3;
        grid[1][14] = 3;
        grid[1][15] = 3;
        grid[2][15] = 3;
        grid[3][15] = 3;
        grid[4][15] = 3;
        grid[5][15] = 3;
        grid[5][16] = 3;
        grid[5][17] = 3;
        grid[5][18] = 4;
        break;

    case 6:
        grid[1][2] = 3;
        grid[1][3] = 3;
        grid[1][4] = 3;
        grid[2][4] = 3;
        grid[3][4] = 3;
        grid[4][4] = 3;
        grid[5][4] = 3;
        grid[6][4] = 3;
        grid[7][4] = 3;
        grid[8][4] = 3;
        grid[8][5] = 3;
        grid[8][6] = 3;
        grid[8][7] = 3;
        grid[7][7] = 3;
        grid[6][7] = 3;
        grid[6][8] = 3;
        grid[6][9] = 3;
        grid[6][10] = 3;
        grid[6][11] = 3;
        grid[5][11] = 3;
        grid[4][11] = 3;
        grid[4][10] = 3;
        grid[4][9] = 3;
        grid[4][8] = 3;
        grid[3][8] = 3;
        grid[2][8] = 3;
        grid[1][8] = 3;
        grid[1][9] = 3;
        grid[1][10] = 3;
        grid[1][11] = 3;
        grid[1][12] = 3;
        grid[1][13] = 3;
        grid[1][14] = 3;
        grid[1][15] = 3;
        grid[2][15] = 3;
        grid[3][15] = 3;
        grid[4][15] = 3;
        grid[5][15] = 3;
        grid[5][16] = 3;
        grid[5][17] = 3;
        grid[4][2] = 3;
        grid[4][3] = 3;
        grid[4][5] = 3;
        grid[4][6] = 3;
        grid[9][4] = 3;
        grid[10][4] = 3;
        grid[11][4] = 3;
        grid[12][4] = 3;
        grid[13][4] = 3;
        grid[11][3] = 3;
        grid[11][2] = 3;
        grid[9][7] = 3;
        grid[10][7] = 3;
        grid[11][7] = 3;
        grid[12][7] = 3;
        grid[8][8] = 3;
        grid[8][9] = 3;
        grid[8][10] = 3;
        grid[8][11] = 3;
        grid[8][12] = 3;
        grid[9][12] = 3;
        grid[9][10] = 3;
        grid[10][10] = 3;
        grid[11][10] = 3;
        grid[11][11] = 3;
        grid[6][15] = 3;
        grid[7][15] = 3;
        grid[8][15] = 3;
        grid[5][18] = 4;
        break;

    case 7:
        grid[1][9] = 2;
        grid[2][9] = 2;
        grid[3][9] = 2;
        grid[4][9] = 2;
        grid[5][9] = 2;
        grid[5][18] = 2;
        grid[5][17] = 2;
        grid[5][16] = 2;
        grid[5][15] = 2;
        grid[5][14] = 2;
        grid[14][18] = 2;
        grid[14][17] = 2;
        grid[14][16] = 2;
        grid[14][15] = 2;
        grid[14][14] = 2;
        grid[18][9] = 2;
        grid[17][9] = 2;
        grid[16][9] = 2;
        grid[15][9] = 2;
        grid[14][9] = 2;
        grid[11][1] = 2;
        grid[11][2] = 2;
        grid[11][3] = 2;
        grid[11][4] = 2;
        grid[11][5] = 2;
        grid[8][1] = 2;
        grid[8][2] = 2;
        grid[8][3] = 2;
        grid[8][4] = 2;
        grid[8][5] = 2;
        break;

    case 8:
        grid[1][9] = 2;
        grid[2][9] = 2;
        grid[3][9] = 2;
        grid[4][9] = 2;
        grid[5][9] = 2;
        grid[5][18] = 2;
        grid[5][17] = 2;
        grid[5][16] = 2;
        grid[5][15] = 2;
        grid[5][14] = 2;
        grid[5][13] = 2;
        grid[5][12] = 2;
        grid[14][18] = 2;
        grid[14][17] = 2;
        grid[18][9] = 2;
        grid[17][9] = 2;
        grid[16][9] = 2;
        grid[15][9] = 2;
        grid[14][9] = 2;
        grid[13][9] = 2;
        grid[12][9] = 2;
        grid[11][9] = 2;
        grid[10][9] = 2;
        grid[11][6] = 2;
        grid[11][1] = 2;
        grid[11][2] = 2;
        grid[11][3] = 2;
        grid[11][4] = 2;
        grid[11][5] = 2;
        grid[8][1] = 2;
        grid[8][2] = 2;
        grid[8][3] = 2;
        grid[8][4] = 2;
        break;

    case 9:
        grid[1][9] = 2;
        grid[2][9] = 2;
        grid[3][9] = 2;
        grid[4][9] = 2;
        grid[5][9] = 2;
        grid[5][18] = 2;
        grid[5][17] = 2;
        grid[5][16] = 2;
        grid[6][16] = 2;
        grid[7][16] = 2;
        grid[8][16] = 2;
        grid[9][16] = 2;
        grid[10][16] = 2;
        grid[10][17] = 2;
        grid[10][18] = 2;
        grid[18][13] = 2;
        grid[17][13] = 2;
        grid[16][13] = 2;
        grid[15][13] = 2;
        grid[14][13] = 2;
        grid[13][13] = 2;
        grid[13][12] = 2;
        grid[13][11] = 2;
        grid[13][10] = 2;
        grid[14][10] = 2;
        grid[15][10] = 2;
        grid[15][9] = 2;
        grid[15][8] = 2;
        grid[15][7] = 2;
        grid[16][7] = 2;
        grid[17][7] = 2;
        grid[17][6] = 2;
        grid[17][5] = 2;
        grid[17][4] = 2;
        grid[18][4] = 2;
        grid[12][1] = 2;
        grid[12][2] = 2;
        grid[12][3] = 2;
        grid[12][4] = 2;
        grid[12][5] = 2;
        grid[12][6] = 2;
        grid[11][6] = 2;
        grid[10][6] = 2;
        grid[10][5] = 2;
        grid[10][4] = 2;
        grid[10][3] = 2;
        grid[9][3] = 2;
        grid[8][3] = 2;
        grid[7][3] = 2;
        grid[6][3] = 2;
        grid[6][4] = 2;
        grid[6][5] = 2;
        grid[6][6] = 2;
        grid[5][6] = 2;
        grid[4][6] = 2;
        grid[4][5] = 2;
        grid[4][4] = 2;
        grid[4][3] = 2;
        grid[4][2] = 2;
        grid[4][1] = 2;
        break;
    }
}

public static final int WHITE   = 0;
public static final int BLACK   = 1;
public static final int BLUE    = 2;
public static final int YELLOW  = 3;
public static final int GREEN   = 4;

private int[][] grid = null;
private int size = 20;
}

它很大，因此我没有发布它，因为我目前不确定什么是有效的。

Answer 1

我不是 100% 清楚你在问什么，但为什么不在 Room 中包含一个方法来获取当前号码，例如:

public class Room {
   private int _roomNumber;

   public Room(int roomNumber) {
      _roomNumber = roomNumber;
   }

   public int getRoomNumber() {
      return _roomNumber;
   }
}

public class Robot {
   public void move(Room room) {
      int currentRoom = room.getRoomNumber();
   }
}