Write code to Replace the character in str at index with replacement.
//package com.book2s; public class Main { public static void main(String[] argv) { String str = "book2s.com"; int idx = 2; char replacement = 'a'; System.out.println(replaceCharAtIdx(str, idx, replacement)); }/*from w w w . ja v a 2s . co m*/ /** * Replaces the character in str at idx with *replacement. * * @param str The original String * @param idx An Integer representing the idx of the char being replaced. * @param replacement The char being inserted into str at idx. * * @return The new String with replacement at idx. * */ public static String replaceCharAtIdx(String str, int idx, char replacement) { char array[] = str.toCharArray(); array[idx] = replacement; str = new String(array); return str; } }