Java String Manipulation Made Simple

String questions are everywhere in coding interviews. And most of them are built on a few simple patterns: Two pointers Character arrays StringBuilder Master these, and many problems become easy. 1. Reverse a String The easiest way: public static String reverse(String str) { return new StringBuilder(str).reverse().toString(); } Manual Reverse public static String reverseManual(String str) { char[] arr = str.toCharArray(); int left = 0, right = arr.length - 1; while (left }