Method swap

Java/Recursion/Permutation.java:3–10

(String mystring, int i, int j)

import java.util.*;
class Permutation {
    static String swap(String mystring, int i, int j) // function to swap the characters in the string
    {
        char ch[] = mystring.toCharArray();
        char tempo = ch[i];
        ch[i] = ch[j];
        ch[j] = tempo;
        return String.valueOf(ch);
    }
    static void permutation(String s, int index) // To permuatate the string
    {
        if (index == s.length() - 1) // if the index equals the length, print the string