Here you can find the source of bt4ToHex(String binary)
private static String bt4ToHex(String binary)
//package com.java2s; public class Main { private static String bt4ToHex(String binary) { String hex = ""; if (binary.equalsIgnoreCase("0000")) { hex = "0"; } else if (binary.equalsIgnoreCase("0001")) { hex = "1"; } else if (binary.equalsIgnoreCase("0010")) { hex = "2"; } else if (binary.equalsIgnoreCase("0011")) { hex = "3"; } else if (binary.equalsIgnoreCase("0100")) { hex = "4"; } else if (binary.equalsIgnoreCase("0101")) { hex = "5"; } else if (binary.equalsIgnoreCase("0110")) { hex = "6"; } else if (binary.equalsIgnoreCase("0111")) { hex = "7"; } else if (binary.equalsIgnoreCase("1000")) { hex = "8"; } else if (binary.equalsIgnoreCase("1001")) { hex = "9"; } else if (binary.equalsIgnoreCase("1010")) { hex = "A"; } else if (binary.equalsIgnoreCase("1011")) { hex = "B"; } else if (binary.equalsIgnoreCase("1100")) { hex = "C"; } else if (binary.equalsIgnoreCase("1101")) { hex = "D"; } else if (binary.equalsIgnoreCase("1110")) { hex = "E"; } else if (binary.equalsIgnoreCase("1111")) { hex = "F"; }//from ww w . jav a 2s.c om return hex; } }