Question

因此，对于我正在创建的游戏，我有一些扩展GameDriver的类。

到目前为止，在所有其他课程中，我已经能够扩展GameDriver，然后在GameDriver中我可以做到：

ArrayList<Card>  library = new ArrayList<Card>();

今天我开始使用GameAI课程，并扩展了GameDriver，当我放入：

GameAI Enemy = new GameAI();

在同一地点，我把另一行代码放在公共类GameDriver下面

我明白了：

java.lang.StackOverflowError
at java.util.WeakHashMap.expungeStaleEntries(Unknown Source)
at java.util.WeakHashMap.getTable(Unknown Source)
at java.util.WeakHashMap.get(Unknown Source)
at java.awt.Component.checkCoalescing(Unknown Source)
at java.awt.Component.<init>(Unknown Source)
at java.awt.Container.<init>(Unknown Source)
at java.awt.Panel.<init>(Unknown Source)
at java.awt.Panel.<init>(Unknown Source)
at java.applet.Applet.<init>(Unknown Source)
at GameDriver.<init>(GameDriver.java:14)
at GameAI.<init>(GameAI.java:8)
at GameDriver.<init>(GameDriver.java:40)
at GameAI.<init>(GameAI.java:8)

如果我将它放在applet的public void init（）中，那么它在运行时不会出错，但是我无法通过其他方法访问它，我在看什么？所有的打火机通常都不会帮助我的大脑...

这就是GameAI现在的样子：

public class GameAI extends GameDriver {

    public int life;
    public int energy;

    public void drawPhase(){

    }

    public GameAI(){
        life = 20;
        energy = 2;
    }
}

然后是GameDriver的一些内容：

public class GameDriver extends Applet implements MouseMotionListener,MouseListener {

Graphics g; 
Image offscreen;
Dimension dim; 

int playerLife = 20;
int playerEnergy = 8;

int xMouse; 
int yMouse;
int lineThickness = 4;
int handSize = 6;
int currentHover;
boolean slotHover;
int currentSelected;
boolean slotClicked;
int currentHoverBoard;
boolean slotHoverBoard;
boolean slotClickedBoard;
int currentSelectedBoard;

boolean canPlace;
ArrayList<Card>  library = new ArrayList<Card>();
ArrayList<Card>  hand = new ArrayList<Card>();
ArrayList<Card>  playerBoard = new ArrayList<Card>();
GameAI Enemy;
int[] handBoxX = new int[handSize];
int[] handBoxY = new int[handSize];
int[] handBoxW = new int[handSize];
int[] handBoxH = new int[handSize];

int[] playerBoardX = new int[8];
int[] playerBoardY = new int[8];
int[] playerBoardW = new int[8];
int[] playerBoardH = new int[8];



public void init(){
    this.setSize(640, 480);
    dim = this.getSize();
    addMouseMotionListener(this);
    addMouseListener(this);
    createLibrary();
    drawFirstHand();
    printHand();


    GameAI Enemy = new GameAI();
    checkEnemy();



    offscreen = createImage(this.getSize().width,this.getSize().height);
    g = offscreen.getGraphics(); 
}

public void checkEnemy(){
    System.out.println(Enemy.energy);
}

... Alot more methods and stuff below, but nothing to do with the GameAI enemy

Answer 1

你正在GameDriver中创建一个GameAI对象，它扩展了它的类。这将导致递归继续，直到内存不足。

解决方案：不要这样做。你的GameAI类不应该扩展GameDriver，因为这是分享信息的错误方式，即使你没有这种递归的噩梦，它也无法工作。而是给GameAI一个GameDriver字段，并通过其构造函数将GameDriver实例传递给GameAI。

即，

class GameAI {
   private GameDriver gameDriver;

   public GameAI(GameDriver gameDriver) {
      this.gameDriver = gameDriver;
   }

   //.... more code
}

编辑2
如果你想要一个GameAI对象，你可以做

GameAI gameAi = new GameAI(this);

如果你想要一个数组或它们的列表，你就可以循环执行。

在init之外的java中创建一个Object

1 个答案: