How to convert Byte[] to byte[] in java?

Question:

How to convert Byte[] to byte[] in java?

Code:

import java.util.Arrays;
 
public class BytesToBytes {
  public static void main(String[] args) {
 
    Byte[] B = new Byte[]{1,2,3,4,5,6,7,8,9};
    byte[] b = new byte[B.length];
 
    for (int i = 0; i < B.length; i++) {
      b[i] = B[i];
    }
 
    System.out.println("Byte[] B: " + Arrays.toString(B));
    System.out.println("byte[] b: " + Arrays.toString(b));
  }
}

Output:

$ java BytesToBytes
Byte[] B: [1, 2, 3, 4, 5, 6, 7, 8, 9]
byte[] b: [1, 2, 3, 4, 5, 6, 7, 8, 9]