Java 2D 数组：乘法表
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Java 2D Array: Multiplication Table
提问by user2990722
I'm not sure why my code will not work. Help please! :D
我不确定为什么我的代码不起作用。请帮忙！:D
public static int[][] timesTable(int r, int c)
{
int [][] yes = new int[r][c];
for (int row = 1; row <= yes.length ; row++)
{
for (int column = 1; column <= yes[row].length; column++)
{
yes[row][column] = (row)*(column);
}
}
return yes;
采纳答案by MouseLearnJava
The index of Array should start 0rather 1.
数组的索引应该开始0相当1。
Change to the following code and have a try.
改成下面的代码试试看。
public static int[][] timesTable(int r, int c)
{
int [][] yes = new int[r][c];
for (int row = 0; row < yes.length ; row++)
{
for (int column = 0; column < yes[row].length; column++)
{
yes[row][column] = (row+1)*(column+1); }
}
return yes;
}
Test code and output in console is as follows:
测试代码和控制台输出如下：
public class Test1 {
public static void main(String[] args) {
int[][] data = new int[5][5];
data = timesTable(5,5);
for (int row = 0; row < data.length ; row++)
{
for (int column = 0; column < data[row].length; column++)
{
System.out.printf("%2d ",data[row][column]);
}
System.out.println();
}
}
public static int[][] timesTable(int r, int c)
{
int [][] yes = new int[r][c];
for (int row = 0; row < yes.length ; row++)
{
for (int column = 0; column < yes[row].length; column++)
{
yes[row][column] = (row+1)*(column+1);
}
}
return yes;
}
}
Output in Console:
控制台输出：
1 2 3 4 5
2 4 6 8 10
3 6 9 12 15
4 8 12 16 20
5 10 15 20 25
回答by Harry
If you're getting ArrayIndexOutOfBounds its because you are starting from index 1, when it should be 0.
如果你得到 ArrayIndexOutOfBounds 是因为你是从索引 1 开始的，它应该是 0。
This should do the job:
这应该可以完成这项工作：
public static int[][] timesTable(int r, int c)
{
int [][] yes = new int[r][c];
for (int row = 1; row <= yes.length ; row++)
{
for (int column = 1; column <= yes[row].length; column++)
{
yes[row-1][column-1] = (row)*(column);
}
}
return yes;
}
回答by Anurag Suman
int a[][]={{2,3},{3,4}};
int b[][]={{2,3},{3,4}};
int c[][]=new int[2][2];
for(int i=0;i<2;i++){
for(int j=0;j<2;j++){
c[i][j]=a[i][j]*b[i][j];
System.out.print(c[i][j]+"\t");
}
System.out.println();
}
