Determinant counting program

Question

I`m doing a program that calculates determinants, but something wrong with my code. Class Three() is not working in main cases.

import java.util.Scanner;

public class Determinant {
public static double Three(int arr[][]) {
double det = 3;
for (byte i = 0; i <= 2; i++)
for (byte j = 0; j <= 2; j++)
det = (arr[1][1] * arr[2][2] * arr[3][3])
+ (arr[1][2] * arr[2][3] * arr[3][1] + arr[2][1] * arr[3][2] * arr[1][3])
- ((arr[3][1] * arr[2][2] * arr[1][3] + arr[2][1] * arr[1][2] * arr[3][3])
+ (arr[3][2] * arr[2][3] * arr[1][1]));
return det;
}

public static double Four() {
double det = 4;
return det;
}

public static double Five() {
double det = 5;
return det;
}

public static void main(String[] args){
byte i; byte j;
int[][] a = new int[5][5];
Scanner input = new Scanner(System.in);
System.out.println("Enter capacity of the matrix (3-5):");
i = input.nextByte();
switch (i) {
case 3:
for (i=0;i<=2;i++)
for (j=0;j<=2;j++)
a[i][j] = input.nextInt();
Three(a[][]);
break;
case 4:
Four();
break;

case 5:
Five();
break;

default:
System.out.println("Enter 3-5 matrix.");
}
input.close();
}
}

Answer 1

in main case 3
// Three(a[][]);
double result = Three(a);
...
System.out.println(result);