オブジェクトを2D配列に格納してJFrameに表示します

Question

こんにちはpeps（壊れた英語）、

私は2D迷路ゲームで作業しています。 2D配列にオブジェクトを格納するには、いくつかの助けが必要です。私はこの1つでNullPointerを取得します：this.currentMap [colsCount] [rowsCount] = objects.get（col）;. mainはLevelGeneratorコンストラクタを呼び出します。 itemObjectの

public final class LevelGenerator extends JFrame { 

private HashMap<String, ItemObject> objects = new HashMap<>(); 
private ItemObject[][] currentMap; 
private int HEIGHT = 320; 
private int WIDHT = 480; 

public JFrame frame = null; 

public Level currentLevel = null; 

private final List<Level> levels 
     = new ArrayList<Level>() { 
      { 
       add(new Level001()); 
       add(new Level002()); 
       add(new Level003()); 
      } 
     }; 

public LevelGenerator() { 
    // Vul de frame 
    //this.frame = frame; 
    // Vul de objecten lijst 
    //objects.put("B", new Bazooka()); 
    objects.put("", new EmptyTile()); 
    objects.put("W", new Wall()); 
    this.currentLevel = levels.get(0); 

    this.Load(); 
} 

/// Laad de map in 
public void Load() { 
    int rowsCount = 0; 
    int colsCount = 0; 

    for (String[] row : this.currentLevel.map) { 
     for (String col : row) { 
      this.currentMap[colsCount][rowsCount] = objects.get(col); 
      colsCount += 1; 
     } 

     rowsCount += 1; 
    } 

    this.Start(); 
} 

public void Start() { 

    this.frame.setSize(this.HEIGHT, this.WIDHT); 
    this.frame.setLayout(new GridLayout(15, 10)); 
    this.frame.add(this.currentLevel); 
    this.frame.setResizable(false); 
    this.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    this.frame.setVisible(true); 

} 
} 

コード：

public class ItemObject { 

public int x = 0; 
public int y = 0; 

public String image = ""; 

public void setImage(String image) { 
    this.image = image; 
} 

} 

Answer 1

あなたはどこにでもItemObject[][] currentMapを初期化していません。あなたはこのコード行を追加することがありstart()方法で：

currentMap = new ItemObject[*# of rows*][*# of columns*]; 

あなたは配列に任意の値を追加する前に、あなたは最初のオブジェクトを初期化する必要があります。

Answer 2

私はそれを修正しました。今私はJFrameでそれをしたい。私はそれを理解することはできません... W =壁と ""空のタイル。コードは次のようになります。

レベル：

public class Level extends JComponent { 

final int ROWS = 10; 
final int COLUMNS = 15; 

public String[][] map = new String[ROWS][COLUMNS]; 
private ItemObject[][] loadedMap; 

public void Load(HashMap<String, ItemObject> objects) { 
    int rowsCount = 0; 

    for (String[] row : this.map) { 
     int colsCount = 0; 

     for (String col : row) { 
      this.loadedMap[rowsCount][colsCount] = objects.get(col); 
      colsCount += 1; 
     } 

     rowsCount += 1; 
    } 
} 

Levelgenerator：

public final class LevelGenerator extends JFrame { 

private HashMap<String, ItemObject> objects = new HashMap<>(); 
private int HEIGHT = 500; 
private int WIDTH = 750; 

public JFrame frame = null; 
public Level currentLevel = null; 

private final List<Level> levels 
     = new ArrayList<Level>() { 
      { 
       add(new Level001()); 
       add(new Level002()); 
       add(new Level003()); 
      } 
     }; 

public LevelGenerator(JFrame frame) { 
    // Vul de frame 
    this.frame = frame; 
    // Vul de objecten lijst 
    objects.put("B", new Bazooka()); 
    objects.put("", new EmptyTile()); 
    objects.put("W", new Wall()); 
    this.currentLevel = levels.get(0); 

    this.Load(); 
} 

/// Laad de map in 
public void Load() { 
    this.currentLevel.Load(objects); 

    this.Start(); 
} 

public void Start() { 
    if (this.frame != null) { 
     this.frame.setSize(this.WIDTH, this.HEIGHT); 
     this.frame.setLayout(new GridLayout(15, 10)); 
     this.frame.add(this.currentLevel); 
     this.frame.setResizable(false); 
     this.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     this.frame.setVisible(true); 
    } 
} 

level001：

public class Level001 extends Level { 

public Level001() { 
    String[][] tiles = { { "W", "W", "W", "W", "W", "W", "W", "W", "W", "W", "W", "W", "W", "W", "W" }, 
           { "W", "", "", "", "", "", "", "", "", "", "", "", "", "", "W" }, 
           { "W", "", "", "", "", "", "", "", "", "", "", "", "", "", "W" }, 
           { "W", "", "", "", "", "", "", "", "", "", "", "", "", "", "W" }, 
           { "W", "", "", "", "", "", "", "", "", "", "", "", "", "", "W" }, 
           { "W", "", "", "", "", "", "", "", "", "", "", "", "", "", "W" }, 
           { "W", "", "", "", "", "", "", "", "", "", "", "", "", "", "W" }, 
           { "W", "", "", "", "", "", "", "", "", "", "", "", "", "", "W" }, 
           { "W", "", "", "", "", "", "", "", "", "", "", "", "", "", "W" }, 
           { "W", "W", "W", "W", "W", "W", "W", "W", "W", "W", "W", "W", "W", "W", "W" } 
          }; 

    super.map = tiles; 
} 

ItemObject：

public class ItemObject { 

public int x = 0; 
public int y = 0; 

private String image = ""; 
private ImageIcon imageIcon; 

public ImageIcon getImageIcon() { 
    return new ImageIcon(this.image); 
} 

public void setImage(String url) { 
    this.image = "/com/maze/images/" + url; 
} 

emptyTileオブジェクト。

public class EmptyTile extends ItemObject { 

public EmptyTile(){ 

    this.setImage("Empty.png"); 

} 

壁オブジェクトは：

public class Wall extends ItemObject { 

public Wall() { 

    this.setImage("Wall.png"); 

}