Write code to check if a string is All Lower Case
//package com.book2s; public class Main { public static void main(String[] argv) { String cs = "book2s.com"; System.out.println(isAllLowerCase(cs)); }/* ww w . j a v a2s . c om*/ public static boolean isAllLowerCase(String cs) { if (cs == null || isEmpty(cs)) { return false; } int sz = cs.length(); for (int i = 0; i < sz; i++) { if (Character.isLowerCase(cs.charAt(i)) == false) { return false; } } return true; } public static boolean isEmpty(String chkStr) { if (chkStr == null) { return true; } else { return "".equals(chkStr.trim()) ? true : false; } } }