別のクラスの変数を使用するには？

Question

私は迷路ゲームを作成しています。そのために私は4つの別々のクラスファイルを作成しました。私は（）メソッドだけでなく、それを読むだけでなく、それに追加して、それを上書きしPlayer.class移動にMaze.classの受刑者にアクセスする方法を知りたい：

Maze.class

package y1; 

import java.util.*; 

@SuppressWarnings(value = "all") 

public class Maze { 
private Room entry; 
private Map <Room, ArrayList<Player>> inmates=new HashMap<Room,ArrayList<Player>>(); 
/** 
* 
* @param r The room that is going to be the entry 
*/ 
public void setEntry(Room r){ 
    this.entry=r; 
    } 
/** 
* 
* @return Returns the entry room 
*/ 
    public Room getEntry(){ 
     return this.entry; 
    } 
    /** 
    * Method adds a player to the maze 
    * @param p Player to be added to the maze 
    */ 
    public void addPlayer(Player p){ 
     ArrayList<Player> players=new ArrayList<Player>(); 
     p.setRoom(getEntry()); 
     if (this.inmates.isEmpty()==true){ 
     players.add(p); 
     this.inmates.put(this.entry,players); 
     } 
     else{ 
     players=this.inmates.get(this.entry); 
     players.add(p); 
     } 

     this.inmates.put(p.getRoom(), players); 

    } 
    public void getPlayers(Room r){ 
     if(this.inmates.get(r)!=null){ 
     System.out.println(Arrays.asList(this.inmates.get(r))); 
     } 
     else{ 
     System.out.println("Ruum on tühi"); 

     } 
    } 
    public Map getInmates(){ 
     return this.inmates; 
    } 
} 

を

Room.class

package y1; 

import java.util.*; 

@SuppressWarnings(value = "all") 
public class Room { 

private String name; 
private Room north; 
private Room east; 
private Room west; 
private Room south; 
private boolean isExit = false; 
private boolean isPortal = false; 
private Maze maze; 

/** 
* @return Returns the name of the room 
*/ 
public String getName() { 
    return this.name; 
} 

/** 
* Sets room name 
* 
* @param name 
*/ 
public void setName(String name) { 
    this.name = name; 
} 

/** 
* Gets northern room if any 
* 
* @return pointer to northern room if any, otherwise <code>null</code> 
*/ 
public Room getNorth() { 
    return this.north; 
} 

/** 
* Sets the door to the next room to the north in that room and in the other 
* room sets southern door as connecting back to that room 
* 
* @param otherRoom 
*/ 
public void setNorth(Room otherRoom) { 
    this.north = otherRoom; 
    otherRoom.south = this; 
} 
public Room getSouth() { 
    return this.south; 
} 

/** 
* Sets the door to the next room to the south in that room and in the other 
* room sets northern door as connecting back to that room 
* 
* @param otherRoom 
*/ 
public void setSouth(Room otherRoom) { 
    this.south = otherRoom; 
    otherRoom.north = this; 
} 
public Room getEast() { 
    return this.east; 
} 

/** 
* Sets the door to the next room to the east in that room and in the other 
* room sets western door as connecting back to that room 
* 
* @param otherRoom 
*/ 
public void setEast(Room otherRoom) { 
    this.east = otherRoom; 
    otherRoom.west = this; 
} 
public Room getWest() { 
    return this.west; 
} 

/** 
* Sets the door to the next room to the west in that room and in the other 
* room sets eastern door as connecting back to that room 
* 
* @param otherRoom 
*/ 
public void setWest(Room otherRoom) { 
    this.west = otherRoom; 
    otherRoom.east = this; 
} 
/** 
* Returns the room in the given direction 
* 
* @param Which way to move? 
* @return The room in that direction. 
*/ 
public Room get(String direction){ 
    Room dir=this; 
    if(direction=="N" && this.north!=null){ 
     dir=dir.getNorth(); 
     return dir; 
    } 
    else if(direction=="W" && this.west!=null){ 
     dir=dir.getWest(); 
     return dir; 
    } 
    else if(direction=="E" && this.east!=null){ 
     dir=dir.getEast(); 
     return dir; 
    } 
    else if(direction=="S" && this.south!=null){ 
     dir=dir.getSouth(); 
     return dir; 
    } 
    else{ 
     return dir; 
    } 


} 
/** 
* Returns the room that givens coordinates point to 
* 
* @param dirlist List of directions 
* @return returns Returns the room it stops in 
*/ 
public Room get(List<String> dirlist){ 
    Room dir=this; 
    if (validate(dirlist)==true){ 
     for(int i=0;i<dirlist.size();i++){ 
      if(dirlist.get(i)=="N"){ 
       dir=dir.getNorth(); 
      } 
      else if(dirlist.get(i)=="W"){ 
       dir=dir.getWest(); 
      } 
      else if(dirlist.get(i)=="E"){ 
       dir=dir.getEast(); 
      } 
      else if(dirlist.get(i)=="S"){ 
       dir=dir.getSouth(); 
      } 
     } 
    } 
    return dir;  
} 


/** 
* creates a new room to the north and connects back to this room 
* 
* @param toa nimi 
*   0 
* @return uus tuba 
*/ 
public Room createNorth(String name) { 
    Room otherRoom = null; 

    // Creates new room only when no room lies ahead in this direction 
    if (this.getNorth() == null) { // Checks north - if nothing there then new room is create 
     otherRoom = new Room(); // Creates new room 
     this.setNorth(otherRoom); // Creates door between rooms 
     otherRoom.setName(name); // Names the room 

    } else { // If room already exists then prints alert message 
     System.out.println("Room already exist!"); 
    } 

    return otherRoom; 
} 
public Room createSouth(String name) { 
    Room otherRoom = null; 
    if (this.getSouth() == null) { 
     otherRoom = new Room(); 
     this.setSouth(otherRoom); 
     otherRoom.setName(name); 

    } else { 
     System.out.println("Room already exists!"); 
    } 

    return otherRoom; 
} 
public Room createEast(String name) { 
    Room otherRoom = null; 
    if (this.getEast() == null) { 
     otherRoom = new Room(); 
     this.setEast(otherRoom); 
     otherRoom.setName(name); 

    } else { 
     System.out.println("Room already exists!"); 
    } 

    return otherRoom; 
} 
public Room createWest(String name) { 
    Room otherRoom = null; 
    if (this.getWest() == null) { 
     otherRoom = new Room(); 
     this.setWest(otherRoom); 
     otherRoom.setName(name); 

    } else { 
     System.out.println("Room already exists!"); 
    } 

    return otherRoom; 
} 
public void setExit(){ 
    this.isExit=true; 
} 

public void setPortalA(){ 
    this.isPortal=true; 
} 
public boolean validate(List<String> pathList){ 
    Room check = this; 
    boolean value=false; 
    for(int i = 0;i<pathList.size();i++){ 
     if(pathList.get(i)=="N" && check.north!=null){ 
      check=check.north; 
      value=true; 
     } 
     else if(pathList.get(i)=="S" && check.south!=null){ 
      check=check.south; 
      value=true; 
     } 
     else if(pathList.get(i)=="W" && check.west!=null){ 
      check=check.west; 
      value=true; 
     } 
     else if(pathList.get(i)=="E" && check.east!=null){ 
      check=check.east; 
      value=true; 
     } 
     else{ 
      value = false; 
      System.out.println("Can't move in the given directions!"); 
     } 
    } 
    return value;  
} 

@Override 
public String toString() { 
    return this.getName(); 
} 

}

とPlayer.class

package y1; 

import java.util.*; 

public class Player { 
private String name; 
private Room location; 

public void setRoom(Room r){ 
    this.location=r; 
} 
public Room getRoom(){ 
    System.out.println(this.name+" is at " +this.location); 
    return this.location; 

} 


public Room move(String dir){ 
    Player p=this; 
    if(dir=="N" && this.location.getNorth()!=null){ 
     p.location=p.location.getNorth(); 
    } 
    else if(dir=="S" && this.location.getSouth()!=null){ 
     p.location=p.location.getSouth(); 
    } 
    else if(dir=="W" && this.location.getWest()!=null){ 
     p.location=p.location.getWest(); 
    } 
    else if(dir=="E" && this.location.getEast()!=null){ 
     p.location=p.location.getEast(); 
    } 
    else{ 
     System.out.println("There's a wall in the way!"); 
    } 
    return this.location; 
} 
public Room move(List<String> dirList){ 
    Player player=this; 
     for(int i=0 ; i<dirList.size() ; i++){ 
      if(dirList.get(i)=="N" && player.location.getNorth()!=null){ 
       player.location=player.location.getNorth(); 
      } 
      else if(dirList.get(i)=="S" && player.location.getSouth()!=null){ 
       player.location=player.location.getSouth(); 
      } 
      else if(dirList.get(i)=="W" && player.location.getWest()!=null){ 
       player.location=player.location.getWest(); 
      } 
      else if(dirList.get(i)=="E" && player.location.getEast()!=null){ 
       player.location=player.location.getEast(); 
      } 
      else{ 
       System.out.println("Wall in the way. Stopping!"); 
       break; 
      } 
     } 
    return this.location; 
} 

public void setName(String n){ 
    this.name=n; 
} 


@Override 
public String toString() { 
    return this.name; 
} 

}

Answer 1

プレーヤーは、getInmates（）メソッド（またはその他の修飾メソッド）を呼び出すために、何らかの方法でMazeオブジェクトへの参照を持つ必要があります。

どのようにリファレンスを取得するかはあなた次第であり、さまざまな方法があります。 1つの方法は、プレイヤーの場所（ルームオブジェクト）に参照を提供させることです。これを行うには、ルームの迷路を返すルームオブジェクトにgetMaze（）メソッドを実装できます。 Playerのmove（）メソッドでは、Playerの 'location'プロパティ（Room）でgetMaze（）を呼び出し、返されたMazeオブジェクトでgetInmates（）を呼び出すことができます。

その後、Mazeオブジェクトの修飾子/リセットメソッドをどのように実装したいのかだけです。

Answer 2

モディファイアメソッドを作成する必要があります。

public void resetInmates(){ 
    this.inmates = new Map(); 
} 

public void addInmate(Room r, ArrayList<Player> players){ 
} 

public void removeInmate(Room r){ 
} 

など

Answer 3

単に代わりに（おそらくも見えパッケージ）同じパッケージ内の他のクラスのそれが読みやすくなりますが、getterメソッドをcreataする良いデザインだろう受刑者フィールドからprivateを削除します。