# 如何使用for循环创建一个二维数组，并分配线性值，增量为10？

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How can I use a for loop to create a two dimensional array and assign linear values with an increment of 10?

# 问题

``````我想使用for循环创建一个二维数组，并希望以10的增量分配值。到目前为止，这是我的代码，但我没有得到想要的结果...

int rows = 3;
int columns = 3;

int[][] array = new int[rows][columns];

for (int i = 0; i &lt; rows; i++) {
for (int j = 0; j &lt; columns; j++) {
array[i][j] = j * 10;
System.out.println(array[i][j]);
}
}
``````

``````0    30    60
10   40    70
20   50    80

Process finished with exit code 0
``````

``````0
10
20
0
10
20
0
10
20

Process finished with exit code 0
``````

I want to create a two dimensional array using a for loop and I want to assign values with an increment of 10. So far here is what I have and I am not getting the result I want...

``````package ~/TwoDimensionalArray;

import java.util.Scanner;

public class TwoDimensionalArray {

public static void main(String[] args) {

int rows = 3;
int columns = 3;

int[][] array = new int[rows][columns];

for (int i = 0; i &lt; rows; i++) {
for (int j = 0; j &lt; columns; j++) {
array[i][j] = j * 10;
System.out.println(array[i][j]);
}
}

}

}
``````

Here is what I want my output to be:

``````0	30	60
10	40	70
20	50	80

Process finished with exit code 0
``````

Here is what I keep getting:

``````0
10
20
0
10
20
0
10
20

Process finished with exit code 0
``````

# 答案1

• 每个数字后不应该打印新行。
• 只有在每行被打印后才应该打印新行，也就是在外部循环的每次迭代后。
• 每个数字后面也应该打印一个制表符，以防止数字粘在一起。
• 你可以使用公式 `j * 10 * rows + i * 10` 计算第 i 行第 j 列的数字，这样可以得到每个位置上的正确数字。

• You should not print a new line after each number.
• You should only print a new line after each row is printed, that is, after each iteration of the outer loop.
• You should also print a tab character after each number so that the numbers don't stick together
• You should calculate the number at row i column j using the formula `j * 10 * rows + i * 10`. This gives you the correct number at each position.
``````int rows = 3;
int columns = 3;

int[][] array = new int[rows][columns];

for (int i = 0; i &lt; rows; i++) {
for (int j = 0; j &lt; columns; j++) {
array[i][j] = j * 10 * rows + i * 10;
System.out.print(array[i][j]); // &quot;print&quot; doesn&#39;t print a new line
System.out.print(&quot;\t&quot;); // print a tab!
}
System.out.println(); // print a new line here
}
``````

# 答案2

``````public class TempTest {
static final int ROW = 3;
static final int COLUMN = 3;

public static void main(String[] args) {
int[][] array = new int[ROW][COLUMN];
// 为数组分配值
for (int i = 0; i < ROW; i++) {
for (int j = 0; j < COLUMN; j++) {
array[i][j] = 10 * (i + 3 * j);
}
}
// 显示数组
for (int i = 0; i < ROW; i++) {
for (int j = 0; j < COLUMN; j++) {
System.out.print(array[i][j]);
System.out.print(' ');
}
System.out.println();
}
}
}
``````

``````0 30 60
10 40 70
20 50 80
``````

maybe this is what u want

``````public class TempTest {
static final int ROW = 3;
static final int COLUMN = 3;

public static void main(String[] args) {
int[][] array = new int[ROW][COLUMN];
// assign values to array
for (int i = 0; i &lt; ROW; i++) {
for (int j = 0; j &lt; COLUMN; j++) {
array[i][j] = 10 * (i + 3 * j);
}
}
// display array
for (int i = 0; i &lt; ROW; i++) {
for (int j = 0; j &lt; COLUMN; j++) {
System.out.print(array[i][j]);
System.out.print(&#39; &#39;);
}
System.out.println();
}
}
}
``````

and the result will be

``````0 30 60
10 40 70
20 50 80
``````

I think u are not familiar with the difference between `print` and `println`, the latter one will add a new line. Try learn more about JAVA, good luck!

# 答案3

``````int rows = 3;
int columns = 3;

int[][] array = new int[rows][columns];

for (int i = 0, v = 0; i < rows; i++) {
for (int j = 0; j < columns; j++, v += 10) {
array[i][j] = v;
System.out.print(array[i][j] + "\t");
}
System.out.println();
}
``````

Try this.

``````int rows = 3;
int columns = 3;

int[][] array = new int[rows][columns];

for (int i = 0, v = 0; i &lt; rows; i++) {
for (int j = 0; j &lt; columns; j++, v += 10) {
array[i][j] = v;
System.out.print(array[i][j] + &quot;\t&quot;);
}
System.out.println();
}
``````

• 本文由 发表于 2020年7月22日 08:21:57
• 转载请务必保留本文链接：https://go.coder-hub.com/63024912.html
• arrays
• for-loop
• java

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