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Hi I am pretty new to Java and I am trying to figure out how to create a columnar transposition cipher. If you have created one can you show how it is coded. The cipher encrypts by finding printing out a column depending on the index of a key. For example if the key is TAPE then there would be 4 columns by how many ever rows depending on the length of a input string. Then the system would print out depending on which letter comes first in the alphabet, in this case the column A would be printed first then E and so on forth. I need to know how to print out these columns in the order of the key. I know how to create the columns for the input string. Any help would be greatly appreciated!!!

import java.util.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Collections;
import java.io.PrintWriter;

public class SortEncrypt 
 public static String key;
 public static char sortKey;
 public SortEncrypt(String theKey) 
 key = theKey;
 List<Integer> myList = new ArrayList<Integer>();
 char tempArray = key.toCharArray();
 Arrays.sort(tempArray);
 /// I am trying to sort the array and the give the index of the character in the sorted array to the same character of the unsorted array.
 
 public String encrypt(String theString) 
 String s = theString;
 int x = 0;
 int y = 0;
 for (int i = 0; (i * i) < s.length(); i++) 
 y = i;
 x = i + 1;
 
 // creates x arraylists 
 List<List<Character>> column = new ArrayList<>();
 for (int i = 0; i < x; i++) 
 column.add(new ArrayList<>());
 
 


import java.util.Scanner;

public class TranspositionCipher 
 public static void main (String args) 
 Scanner sc = new Scanner(System.in);
 System.out.println("Please print out a word for a key and a sentence for a string: ");
 SortEncrypt s = new SortEncrypt(sc.nextLine());
 

EDIT:

I tried doing the sorting this way of the key:

import java.util.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Collections;
import java.io.PrintWriter;
public class SortEncrypt
{
public static String key;
public static char sortKey;

public SortEncrypt(String theKey)
 key = theKey;
 List<Integer> myList = new ArrayList<Integer>(); 
 char tempArray = key.toCharArray();
 Arrays.sort(tempArray);
 String imp = tempArray.toString();
 System.out.println(key);
 System.out.println(tempArray);
 for (int i = 0; i<imp.length();i ++)
 char a_char = imp.charAt(i);
 if (a_char == a_char)
 int a = key.indexOf(a_char);
 myList.add(a);

 
 
 System.out.println(myList);