Convert 1D array to 2D array.java

class Solution {
    public int[][] construct2DArray(int[] original, int m, int n) {
        if(original.length != m*n){
            return new int [0][0];
        }
        int[][] result = new int[m][n];
            for(int i=0; i<m ; i++){
                for(int j=0; j<n ; j++){
                    result[i][j] = original[i*n + j];
                }
            }
        return result;
    }
}