Ever thought how to fill the whole array with same value in Java !?
in CPP, we use memset or can initialise with any value, when it comes to java, we use Arrays.Fill().
Arrays.fill(name of Array, value), it takes the name of array and value
index
we can use form start index to end index to fill the particular value
int ar[] = {2, 2, 2, 2, 2, 2, 2, 2, 2};
// Fill from index 1 to index 4.
Arrays.fill(ar, 1, 5, 10);
System.out.println(Arrays.toString(ar));
[2, 10, 10, 10, 10, 2, 2, 2, 2]
it is very helpful in Dp or when you want to assign same value.
multiple values
public static void main(String[] args)
{
int [][]ar = new int [3][4];
// Fill each row with 10.
for (int[] row : ar)
Arrays.fill(row, 10);
System.out.println(Arrays.deepToString(ar));
}
we have used Arrays.deepToString() method Printing 2D array.
using stream method
double[][] arr = new double[20][4];
Arrays.stream(arr).forEach(a -> Arrays.fill(a, 0));
3D array
int[][][] ar = new int[3][4][5];
// Fill each row with -1.
for (int[][] row : ar) {
for (int[] rowColumn : row) {
Arrays.fill(rowColumn, -1);
}
}
System.out.println(Arrays.deepToString(ar));
}
understanding
double[][] arr = new double[5][2];
Arrays.fill(arr[0], 0);
Arrays.fill(arr[1], 0);
Arrays.fill(arr[2], 0);
Arrays.fill(arr[3], 0);
Arrays.fill(arr[4], 0);
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