Let's say I have an int[][] anArray = new int[4][4];
And let's say that I wanted to make row 3 of anArray {1, 2, 3, 4}. Could I do that without manually assigning each individual value its value? What if it was column 2 of anArray?
I'm posting this because it's rather inconvenient to do stuff like this:
int[][] foo = new int[bar][baz];
//
//Code that uses other columns of foo
//
for (int n=0; n < bar; n++)
foo[n][1] = bin[n];
If I understand your question correctly, here is the code to assign row index 3 of anArray as {1,2,3,4} without loops:
int[][] anArray = new int[4][4];
anArray[3] = new int[] {1,2,3,4};
System.out.println(Arrays.deepToString(anArray));
Output:
[[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [1, 2, 3, 4]]
anArray[2] - I just chose anArray[3] for reasons beyond my own understanding :)If you want to assign the entire row of a two-dimensional array to another (one-dimensional) array, you can simply do
int[][] foo = new int [3][3];
int[] bin={1,2,3};
foo[1] = bin;
If want to assign the column though, I am afraid that you can only do it manually...
anArray[3] = new int [] {1, 2, 3, 4}
It is basically an array of arrays and so we can add full arrays in one go:
int[][] array = new int[4][4];
for (int i = 0; i < array.length; i++) {
array[i] = new int[] { 1, 2, 3, 4 };
}
You can use a helper method to set a column:
public class MatrixTest {
public static void main(String... args) {
Integer[][] target = new Integer[3][2];
setMatrixColumn( target, 1, new Integer[]{ 1, 1, 1 } );
System.out.println( Arrays.deepToString( target ) );
}
public static <T> void setMatrixColumn(T[][] matrix, int index, T[] values) {
for ( int i = 0; i < values.length; i++ )
matrix[i][index] = values[index];
}
}
foo[2] = new int[]{1,2,3,4};.