I was going through a dp problem, there I have to initialize the matrix with default(-1) values for memoized solution. And felt the need.

We can initialize the 1D array in java like this => Arrays.fill(arr, -1)
what for 2D array…?

Otherwise I have to run a nested for loop to initialize the matrix with default values, that includes more lines of code, and doesn’t look appropriate when you are solving a dp problem.