int[][] arrays = new int[m][n];

//Prepare an array containing the number of elements of the second element (anything is fine)
int[] array = {2, 3, 5};
//Define the number of elements only for the first element
int[][] arrays = new int[array.length][];
for (int i = 0; i < arrays.length; i++){
    //Define the number of elements of the second element while turning the first element with a for statement etc.
    arrays[i] = new int[array[i]];
}

//bonus
System.out.println(arrays.length);
for (int i = 0; i < arrays.length; i++){
    System.out.println(arrays[i].length);
}
//output
//3
//2
//3
//5

int arrays[][][] =new array [m][n];
//abridgement
arrays[i][j] = new int[array[j]];

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