JAVA

filll 2d array in java

double[][] arr = new double[20][4];
Arrays.stream(arr).forEach(a -> Arrays.fill(a, 0));

fill two dimensional array row by row java

//this way u can fill your array row by row

Scanner input = new Scanner(System.in);
for (int i = 0; i < row; i++){
	for (int j = 0; j < column; j++){
        array[i][j] = input.nextInt();
	}
}

//this way u can fill your array column by column
//Scanner input = new Scanner(System.in);
for (int i = 0; i < column; i++){
	for (int j = 0; j < row; j++){
        array[i][j] = input.nextInt();
	}
}

how to fill a 2d array in java

int rows = 5, column = 7;
int[][] arr = new int[rows][column]; 
   
   //2D arrays are row major, so always row first
   
for (int row = 0; row < arr.length; row++)
{
	for (int col = 0; col < arr[row].length; col++)
    {
    	arr[row][col] = 5; //Whatever value you want to set them to
    }
}

java fill two dimensional array stream

IntStream.range(0, array.length).forEach(x -> Arrays.setAll(
    array[x], y -> String.format("%c%c", letter(x), letter(y))));

java fill two dimensional array stream

static String[][] testArraySetAll() {
    String[][] array = new String[3][3];
    Arrays.setAll(array, x -> {
        Arrays.setAll(array[x], y -> String.format("%c%c", letter(x), letter(y)));
        return array[x];
    });
    return array;
}