Swapping Characters in a String in Java

Question

Given the above excerpt from a Java code, I need to modify the code such that it could recursively swap pairs of the content of the string variable, \"locationAddress\". Please

Answer 1

Here's one solution with StringBuilder:

public static String swapAdjacentPairs(String s) {
    StringBuilder sb = new StringBuilder(s);
    // divide 2 and then multiply by 2 to handle cases where the string length is odd
    // we always want an even string length
    // also note the i += 2
    for (int i = 0 ; i < (s.length() / 2 * 2) ; i += 2) {
        swapAdjacent(sb, i);
    }
    return sb.toString();
}

private static void swapAdjacent(StringBuilder sb, int index) {
    char x = sb.charAt(index);
    sb.setCharAt(index, sb.charAt(index + 1));
    sb.setCharAt(index + 1, x);
}

Usage:

System.out.println(swapAdjacentPairs("abcdefghi"));