Write code to capitalize a string
Handle null value, if the null value is passed in just return it back
Use if statement to check of the string is a null value.
Use Character.toUpperCase to convert the first letter to upper case.
//package com.book2s; public class Main { public static void main(String[] argv) { String str = "book2s.com"; System.out.println(capitalize(str)); }// ww w . jav a 2 s . c om public static String capitalize(String str) { if (isEmpty(str)) return str; char[] cs = str.toCharArray(); cs[0] = Character.toUpperCase(cs[0]); return new String(cs); } public static boolean isEmpty(String str) { return str == null || str.length() == 0; } }