为什么我在这里得到“ ArrayIndexOutOfBoundsException”？

Question

Basically title. I create a new fragment of a larger array and I get this error. I have to create a new fragemnt of a larger array to display it. (Think in Pokemon, where the map is the big array but the screen that is shown is the fragment of that map.) Here is the code.

Where the method is called:

    public void showWorldFragment(){
******ERROR WITH THIS LINE*********
        int[][] map = getWorldFragment(mapPack.map);
        if(map[0][0] == 1){
            c.drawBitmap(balloon, 0, 0, null);
        }
        if(map[0][0] == 2){
            c.drawBitmap(archer, 0, 0, null);
        }
        if(map[1][0] == 1){
            c.drawBitmap(balloon, canvasWidth/3, 0, null);
        }
        if(map[1][0] == 2){
            c.drawBitmap(archer, canvasWidth/3, 0, null);
        }
        if(map[2][0] == 1){
            c.drawBitmap(balloon, 2*(canvasWidth/3), 0, null);
        }
        if(map[2][0] == 2){
            c.drawBitmap(archer, 2*(canvasWidth/3), 0, null);
        }
        if(map[0][1] == 1){
            c.drawBitmap(balloon, 0, canvasHeight/3, null);
        }
        if(map[0][1] == 2){
            c.drawBitmap(archer, 0, canvasHeight/3, null);
        }
        if(map[1][1] == 1){
            c.drawBitmap(balloon, canvasWidth/3, canvasHeight/3, null);
        }
        if(map[1][1] == 2){
            c.drawBitmap(archer, canvasWidth/3, canvasHeight/3, null);
        }
        if(map[2][1] == 1){
            c.drawBitmap(balloon, 2*(canvasWidth/3), canvasHeight/3, null);
        }
        if(map[2][1] == 2){
            c.drawBitmap(archer, 2*(canvasWidth/3), canvasHeight/3, null);
        }
        if(map[0][2] == 1){
            c.drawBitmap(balloon, 0, 2*(canvasHeight/3), null);
        }
        if(map[0][2] == 2){
            c.drawBitmap(archer, 0, 2*(canvasHeight/3), null);
        }
        if(map[1][2] == 1){
            c.drawBitmap(balloon, (canvasWidth/3), 2*(canvasHeight/3), null);
        }
        if(map[1][2] == 2){
            c.drawBitmap(archer, (canvasWidth/3),  2*(canvasHeight/3), null);
        }
        if(map[2][2] == 1){
            c.drawBitmap(balloon, 2*(canvasWidth/3), 2*(canvasHeight/3), null);
        }
        if(map[2][2] == 2){
            c.drawBitmap(archer, 2*(canvasWidth/3), 2*(canvasHeight/3), null);
        }

    }

Where the method is called:

    public int[][] getWorldFragment(int[][] map) {
        int centerX = x;
        int centerY = y;
        if(x == 0){
            centerX = 1;
        }
        if(x == map.length){
            centerX = map.length-1;
        }
        if(y == 0){
            centerY = 1;
        }
        if(y == map.length){
            centerY = map.length-1;
        }
        int[][] tempFragmentArray = new int[][]{
                {map[centerX-1][centerY-1], map[centerX][centerY-1], map[centerX + 1][centerY - 1]},
                {map[centerX-1][centerY], map[centerX][centerY], map[centerX + 1][centerY]},
                {map[centerX-1][centerY+1], map[centerX][centerY+1], map[centerX + 1][centerY + 1]},

        };
        return tempFragmentArray;

    }

The mapPack.map is a larger 5x5 array that just holds basic integer values. Does anyone have any idea as to why this happens?

Let me know if any more details are needed.

Thanks :)

Answer 1

I think the inner exception is coming from this line:

 int[][] tempFragmentArray = new int[][]{
                 {map[centerX-1][centerY-1], map[centerX][centerY-1], map[centerX +      1][centerY - 1]},
                 {map[centerX-1][centerY], map[centerX][centerY], map[centerX + 1][centerY]},
                 {map[centerX-1][centerY+1], map[centerX][centerY+1], map[centerX +      1][centerY + 1]},

    };

The variable x and y look to be inner class members and probably they go to wrong index of your 2D map array.