Write code to truncate a string regardless of its length.
//package com.book2s; public class Main { public static void main(String[] argv) { String str = "book2s.com"; int maxLen = 4; System.out.println(truncate(str, maxLen)); }/* w w w. jav a 2 s .c o m*/ /** * truncates a string regardless of its length. This method is a workaround * for a shortcoming of String.substring (int, int) that is unable to handle * the case where the number of characters would extend beyond the end of * the string. */ public static String truncate(String str, int maxLen) { if (str == null || str.length() < maxLen) return str; if (maxLen < 0) return ""; return str.substring(0, maxLen); } /** * same as String.substring, except that this version handles the case * robustly when the index is out of bounds. */ public static String substring(String str, int beginIndex) { if (str == null) return null; if (beginIndex < 0) return str; if (beginIndex >= str.length()) return ""; return str.substring(beginIndex); } /** * same as String.substring, except that this version handles the case * robustly when one or both of the indexes is out of bounds. */ public static String substring(String str, int beginIndex, int endIndex) { if (str == null) return null; if (beginIndex > endIndex) return ""; if (beginIndex < 0) beginIndex = 0; if (endIndex > str.length()) endIndex = str.length(); return str.substring(beginIndex, endIndex); } }