Translator Program That Will Convert English To Custom Binary

I am trying to make a translator program that will convert english to my custom binary. It works going from english to binary, but not going from binary to english.

import java.util.Scanner;
public class Translator
{
public static void main ( String [] args ) {
Scanner input = new Scanner( System.in );
System.out.print( "Would you like to convert English to Binary (yes or no)? " );
String answer = input.nextLine();

[Code] .....