How to swap String characters in Java?

Question

How can I swap two characters in a String? For example, \"abcde\" will become \"bacde\".

Answer 1

String.toCharArray() will give you an array of characters representing this string.

You can change this without changing the original string (swap any characters you require), and then create a new string using String(char[]).

Note that strings are immutable, so you have to create a new string object.

Answer 2

static String  string_swap(String str, int x, int y)
{

    if( x < 0 || x >= str.length() || y < 0 || y >= str.length())
    return "Invalid index";

    char arr[] = str.toCharArray();
    char tmp = arr[x];
    arr[x] = arr[y];
    arr[y] = tmp;

    return new String(arr);
}