英文:
2D Array item swap randomly
问题
我有一个枚举：
public enum Player
{
X, O, NOBODY
}
我有一个用随机玩家项填充的数组：
Player [size][size] p;
示例矩阵：
[ X, NOBODY, NOBODY ]
[ NOBODY, O, O ]
[ X, X, NOBODY ]
我想随机将X或O元素与NOBODY元素交换，应该如何实现？
示例：
[ NOBODY, NOBODY, NOBODY ]
[ NOBODY, O, O ]
[ X, X, X ]
英文:
I have an enum:
public enum Player
{
X, O, NOBODY
}
And I have this array filled with player items randomly:
Player [size][size] p;
Example matrix:
[ X, NOBODY, NOBODY ]
[ NOBODY, O, O ]
[ X, X, NOBODY ]
I would like to swap an X or O element with a NOBODY element randomly, how can I do that?
Example:
[ NOBODY, NOBODY, NOBODY ]
[ NOBODY, O, O ]
[ X, X, X ]
</details>
# 答案1
**得分**: 1
一个直接的方法是选择一个随机的X/O单元，以及一个随机的NOBODY单元，然后交换它们的值：
```java
// 类内的方法，包含数组
public void 交换值() {
Random rand = new Random();
int xoPos;
int nobodyPos;
do {
xoPos = rand.nextInt(size*size);
Player p = p[xoPos / size][xoPos % size];
} while (Player.NOBODY.equals(p));
do {
nobodyPos = rand.nextInt(size*size);
Player p = p[nobodyPos / size][nobodyPos % size];
} while (!Player.NOBODY.equals(p));
p[nobodyPos / size][nobodyPos % size] = p[xoPos / size][xoPos % size];
p[xoPos / size][xoPos % size] = Player.NOBODY;
}
这里的策略是生成一个介于0和二维棋盘单元格总数减一之间的随机数。然后，我们使用整数除法和取模来确定这个单个值对应的二维坐标。
英文:
One straightforward approach would be to select a random X/O cell as well as a random NOBODY cell, and then swap their values:
// method inside class containing the array
public void swapValues() {
Random rand = new Random();
int xoPos;
int nobodyPos;
do {
xoPos = rand.nextInt(size*size);
Player p = p[xoPos / size][xoPos % size];
} while (Player.NOBODY.equals(p));
do {
nobodyPos = rand.nextInt(size*size);
Player p = p[nobodyPos / size][nobodyPos % size];
} while (!Player.NOBODY.equals(p));
p[nobodyPos / size][nobodyPos % size] = p[xoPos / size][xoPos % size];
p[xoPos / size][xoPos % size] = Player.NOBODY;
}
The strategy here is to generate a single random number between 0 and one minus the total number of cells in the 2D board. Then, we use integer division and modulus to figure out to what 2D coordinates that single value corresponds.
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