Java program to capitalize first letter of each word in string

public class FirstWordUpperCase { public static void main(String[] args) { System.out.println(changeString("how are you man")); } private static String changeString(String str) { StringBuffer sb = new StringBuffer(); String[] arr = str.split("\\s"); for (int i = 0; i < arr.length; i++) { sb.append(Character.toUpperCase(arr[i].charAt(0))). append(arr[i].substring(1)).append(" "); } return sb.toString(); } }