Java 随机空方块？@Dr.Avalanche我只是个14岁的孩子。我已经对逻辑进行了编程，但第一步我想让计算机随机选择一个sqaure。请帮帮我！难道你不想让电脑玩家按照游戏逻辑玩，而不是随机选择一个空方块吗？@Dr.Avalanche我只是个14岁的孩子。我已

---

随机空方块？@Dr.Avalanche我只是个14岁的孩子。我已经对逻辑进行了编程，但第一步我想让计算机随机选择一个sqaure。请帮帮我！难道你不想让电脑玩家按照游戏逻辑玩，而不是随机选择一个空方块吗？@Dr.Avalanche我只是个14岁的孩子。我已经对逻辑进行了编程，但第一步我想让计算机随机选择一个sqaure。请帮帮我！您只需从列表中删除该按钮-也要注意随机生成器，以避免IndexOutOfBounds异常！您只需从列表中删除该按钮-也要注意随机生成器，以避免IndexOutOfBounds异常！您只需从列表中删除该按钮-也要注意随机生成器，以避免IndexOutOfBounds异常！您只需从列表中删除该按钮-也要注意随机生成器，以避免IndexOutOfBounds异常！谢谢我一定会试试的。谢谢！我一定会试试的。谢谢！我一定会试试的。谢谢！我一定会试试的。

    btn00 = (Button) findViewById(R.id.button);
    btn01 = (Button) findViewById(R.id.button2);
    btn01 = (Button) findViewById(R.id.button3);
    btn10 = (Button) findViewById(R.id.button4);
    btn11 = (Button) findViewById(R.id.button5);
    btn12 = (Button) findViewById(R.id.button6);
    btn20 = (Button) findViewById(R.id.button7);
    btn21 = (Button) findViewById(R.id.button8);
    btn22 = (Button) findViewById(R.id.button9);

/**
 * RandomArray is a data structure similiar to a set, which removes a random number one at a time and decreases the size of the set by one.
 */
public class RandomArray {
    int size;
    int[] array;

/**
 * The only constructor for this class. assigns numbers from 1 to m in the 0 to m-1 cells respectively. 
 * @param size holds the value of m - meaning, the method will generate a number for each movie.
 */
public RandomArray(int size) {
    this.size = size;
    array = new int[size];
    for (int i = 0; i<size; i++) {
        array[i] = i+1;
    }
}

/**
 * remove removes a number randomly and returns it.
 * with each removal the number in the last cell replaces the removed number and size is decreased by one.
 * @return a random number represents a movie that hasn't been played yet.
 */
public int remove() {
    int ans = -1;
    if (size > 0) {
        // generating a random number from 0 to the last cell. 
        int randomNum = (int)(Math.random()*size);
        ans = array[randomNum];
        // last number replaces the number to be removed.
        array[randomNum] = array[size-1];
        size--;
    }
    return ans;
}
}

int[] state = new int[] {0, 0, 0, 0, 0, 0, 0, 0, 0 }; // int[9] 
Button[] buttons = new Button[] { 
   (Button) findViewById(R.id.button),
   (Button) findViewById(R.id.button2),
   (Button) findViewById(R.id.button3),
   ...
}

Random rnd = new Random();
int index = rnd.nextInt(state.length);
while(state[index] != 0) {
    index = rnd.nextInt(state.length);
}

state[index] = 1;

Button b = buttons[index];
b.set....();
...

int getIndex(Button b) {
   for(int i = 0; i < buttons.length; i++) {
      if(buttons[i].equals(b)) {
         return i;
      }
   }
   return -1;
}