someone explain this code Im a retarded female

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can someone explain this
import java.util.Scanner;
public class Exercise3 {
  public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Input a string: ");
        String str = in.nextLine();
        System.out.print("The middle character in the string: " + middle(str)+"\n");
    }
 public static String middle(String str)
    {
        int position;
        int length;
        if (str.length() % 2 == 0)
        {
            position = str.length() / 2 - 1;
            length = 2;
        }
        else
        {
            position = str.length() / 2;
            length = 1;
        }
        return str.substring(position, position + length);
    }
}