It gives an error that I go outside the array, although I check it in a loop. However, one time, it displays an error.

package supreme; import java.util.Scanner; public class Main { public static void main(String args[]) { menu(); } public static void menu() { Scanner in = new Scanner(System.in); int choice; System.out.print("1.Crypt\n2.Uncrypt\n3.Exit\nPlease make your choice: "); switch(choice = in.nextInt()) { case 1: { System.out.println("Please enter your string which will be crypted: "); String line = in.next(); byte[] crypting = line.getBytes(); System.out.println("Please enter your password(it can be any number): "); String temp = in.next(); char [] password = temp.toCharArray(); for ( int i = 0; i <crypting.length; i ++ ) { System.out.println("Element " + i +" is: " + crypting[i]); } int counter = 0; for (int i = 0; i < crypting.length; i++) { if(counter == crypting.length) counter = 0; if((password[counter] == '1') && (password[counter+1] == '0')) { crypting[i] = (byte)(crypting[i] << 1); } if(password[counter] == '0' && password[counter+1] == '1') { crypting[i] = (byte)(crypting[i] >> 1); } if(password[counter] == '1' && password[counter+1] == '1') { crypting[i] = (byte)(~crypting[i]); } counter+=2; System.out.println(counter); } System.out.println("After crypt!"); for( int i = 0; i <crypting.length; i ++ ) { System.out.println("Element " + i +" is: " + crypting[i]); } String crypted = new String(crypting); System.out.println(crypted); byte [] sss = crypted.getBytes(); for(int i = 0; i < sss.length; i++) { System.out.println(sss[i]); } break; } case 2: { break; } default: System.out.println("Please, choose one of the possible variants:"); menu(); } } }

    1 answer 1

     if (counter >= password.length - 2) counter = 0;