Write code to decamelize a string
//package com.book2s; public class Main { public static void main(String[] argv) { String s = "book2s.com AbcDef"; System.out.println(decamelize(s)); }//from w w w. j a v a 2 s . c o m public static String decamelize(final String s) { if (s == null) { return null; } if (s.length() == 1) { return s.toUpperCase(); } StringBuffer buf = new StringBuffer(40); int pos = 0; for (int i = 1; i < s.length(); ++i) { if (Character.isUpperCase(s.charAt(i))) { if (buf.length() != 0) { buf.append('_'); } buf.append(s.substring(pos, i).toUpperCase()); pos = i; } } if (buf.length() != 0) { buf.append('_'); } buf.append(s.substring(pos, s.length()).toUpperCase()); return buf.toString(); } }