英文:
How to make a toString() method for a 2D Array of Cells using the toString() method of Cell?
问题
我的任务是实现康威的生命游戏，但我卡在了如何在 toString() 方法中表示我的游戏地图（一个二维单元格数组）上。
我的toString()方法：
public String toString() {
int h;
int j;
String str;
str = null;
String[][] stringArray = new String[map.length][map.length];
for (h = 0; h < getWidth(); h++) {
for (j = 0; j < getHeight(); j++) {
Cell i = getCell(h, j);
stringArray[h][j] = i.toString() + " ";
}
}
int k;
int m;
for (k = 0; k < stringArray.length; k++) {
for (m = 0; m < stringArray.length; m++) {
str = stringArray[k][m];
}
}
return str;
}
正如你所看到的，我需要调用特定于单元格的 toString() 方法作为任务的一部分。
这个 toString() 方法如下：
public String toString() {
if (status == ECellStatus.DEAD) {
return ".";
} else {
return "#";
}
}
在实际代码中，我只获得了最后一个单元格的表示，但我想要像这样打印它：
. . . . .
. . # . .
. . . # .
. # # # .
. . . . .
希望有人可以帮助我解决这个问题。
英文:
My task is to implement Conway's Game of Life, but I'm stuck in representing my game-map (a 2D Array of Cells) in the toString() method.
My toString() method:
public String toString() {
int h;
int j;
String str;
str = null;
String[][] stringArray = new String[map.length][map.length];
for (h = 0; h < getWidth(); h++) {
for (j = 0; j < getHeight(); j++) {
Cell i = getCell(h, j);
stringArray[h][j] = i.toString() + " ";
}
}
int k;
int m;
for (k = 0; k < stringArray.length; k++) {
for (m = 0; m < stringArray.length; m++) {
str = stringArray[k][m];
}
}
return str;
}
And as you see I need to call the cell specific toString() method as part of the task.
This toString() method looks like this:
public String toString() {
if (status == ECellStatus.DEAD) {
return ".";
} else {
return "#";
}
}
In the actual code I only get the representation of the last cell but I want to print it like that:
. . . . .
. . # . .
. . . # .
. # # # .
. . . . .
I hope somebody can help me out.
答案1
得分: 2
在第二个for循环中，您正在将str重新分配给当前单元格的toString，而不是在其上附加/添加，这可能是您打算做的操作。
要附加到str，您可以执行以下操作：
for (k = 0; k < stringArray.length; k++) {
for (m = 0; m < stringArray.length; m++) {
str += stringArray[k][m];
}
}
这还需要您将str初始化为非空值，所以代替
str = null; 您需要执行 str = ""; 或类似的操作。
英文:
In the second for-loop, you are reassigning str to the current Cell's toString rather than appending/adding on to it, which is probably what you intended to do.
To append to str, you can do:
for (k = 0; k < stringArray.length; k++) {
for (m = 0; m < stringArray.length; m++) {
str += stringArray[k][m];
}
}
This will also require you to initialize str to a non-null value, so instead of
str = null; you will need to do str = ""; or some equivalent of it.
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