Write code to concatenate the strings and filter out null value.
//package com.book2s; public class Main { public static void main(String[] argv) { String strs = "book2s.com"; System.out.println(concat(strs)); }//from w w w . j a v a 2s .c o m /** * concatenate the strings. Null string convert to blank string. * @param strs * @return * @author <a href="mailto:iffiff1@gmail.com">Tyler Chen</a> * @since 2015-2-6 */ public static String concat(String... strs) { if (strs == null || strs.length == 0) { return ""; } StringBuilder sb = new StringBuilder(); for (String str : strs) { if (str == null) { str = ""; } sb.append(str); } return sb.toString(); } }