Write code to check if a string has All Letters
//package com.book2s; public class Main { public static void main(String[] argv) { String str = "book2s.com"; System.out.println(hasAllLetters(str)); }//from w w w. ja v a2s.c o m /** * * @param str The String. * * @return true if the string is all letters. * */ public static boolean hasAllLetters(String str) { int i; for (i = 0; i < str.length(); i++) if (!isLetter(str.charAt(i))) return false; if (str.length() == 0) return false; return true; } /** * * @param ch The Character. * * @return true if the character is a capital or lowercase letter. * */ public static boolean isLetter(char ch) { if (ch >= 'A' && ch <= 'Z' || ch >= 'a' && ch <= 'z') return true; return false; } }