英文:
Automatic matrix creator on Java
问题
这是你的代码的翻译部分：
我想要创建二维矩阵，根据输入进行自动化操作，然后使它们返回以查看结果。
这是我的代码：
```java
public class Two_dimensional_arrays {
static int[][] array1;
public static int[][] create_array(int number1, int number2) {
int k = 1;
for (int j = 0; j <= number2; j++) {
for (int i = 0; i <= number1; i++) {
array[i][j] = k;
k++;
}
}
return array1;
}
}
所有这一切背后的逻辑是以顺序填充任何矩阵，例如（让我们创建一个3x3的矩阵）
1-2-3
4-5-6
7-8-9
因此，矩阵会自动以升序填充，但由于我对编程还比较新，所以结果并不如预期。
<details>
<summary>英文:</summary>
I wanted to create two-dimensional matrixes on an automated routine (depending on inputs) and then make them return to see the results.
Here's my code:
```java
public class Two_dimensional_arrays {
static int[][] array1;
public static int[][] create_array(int number1, int number2) {
int k = 1;
for (int j = 0; j <= number2; j++) {
for (int i = 0; i <= number1; i++) {
array[i][j] = k;
k++;
}
}
return array1;
}
}
The logic behind all of that was to fill any matrix in order like (let's make a 3x3 one)
1-2-3
4-5-6
7-8-9
So the matrix would be automatically filled (in ascending order), but it didn't work out as expected since I'm kind of new to programming.
答案1
得分: 2
你必须在某处实际分配数组。
static int[][] array1;
这声明了一个变量，可以容纳对数组的引用；它并不是数组本身。数组是通过'new'来分配的：
static int[][] array1 = new int[3][3];
还有一些其他要点：
-
循环中的'array'可能应该改为'array1'。
-
由于'array1'是成员变量，因此可能没有必要将其作为返回值。你可以选择以下任一方式：保持单个数组，如目前所示，然后每次都使用create_array方法进行覆盖；或者让create_array分配一个预期大小的数组（
new int[number1][number2]）并将其返回。我会选择后者。 -
参数的命名可以更好：'row_count' 而不是 'number1'，'column_count' 而不是 'number2' - 或者使用任何传达预期含义的类似名称。（通常，Java程序员使用驼峰命名法，如rowCount，而不是下划线，但这不是一个特别有趣的讨论，也不是我在这里要点的内容）。
英文:
You have to actually allocate the array somewhere.
static int[][] array1;
This declares a variable capable of holding a reference to an array; it is not the array. The array is allocated by 'new':
static int[][] array1 = new int[3][3];
A couple of other points:
-
The 'array' in your loop should probably be 'array1'.
-
Since 'array1' is a member variable there's probably no point in returning it as well. You could go either way: have a single array, as at present, and your create_array method will overwrite it each time; OR have create_array allocate an array of the intended size (
new int[number1][number2]) and return it. I'd go for the latter. -
The arguments could be named better: 'row_count' rather than 'number1', 'column_count' rather than 'number2' -- or anything similar that conveys the intended meaning. (Typically Java programmers use camel-case names, like rowCount, rather than underscore, but that's not a particularly interesting discussion and not my point here).
答案2
得分: 0
public class Two_dimensional_arrays {
public static int[][] create_array(int number1, int number2){
int[][] matrix = new int[number1][number2];
int k = 1;
for(int i = 0; i < number1; i++){
for(int j = 0; j < number2; j++){
matrix[i][j] = k;
k++;
}
}
return matrix;
}
}
英文:
public class Two_dimensional_arrays {
public static int[][] create_array(int number1, int number2){
int[][] matrix = new int[number1][number2];
int k = 1;
for(int i = 0; i<number1; i++){
for(int j = 0; j<number2; j++){
matrix[i][j] = k;
k++;
}
}
return matrix;
}
}
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