Simple Permutations

package permutations;

import java.util.ArrayList;
import java.util.List;

public class Permutations {
    public static void main (String args[]) {
        System.out.println(perm("abcdefg"));
    }

    private static List <String> perm(String word) {

        ArrayList <String> list = new ArrayList <String> ();
        StringBuilder temp;


        if (word.length() == 1) {
            list.add(word);
        }
        else if (word.length() > 1) {

            for(int i = 0; i < word.length(); i++) {
                temp = new StringBuilder(word);

                char firstchar = temp.charAt(i);
                temp.deleteCharAt(i);

                for(String s:perm(temp.toString()))
                    list.add(firstchar + s);


            }

        }


        return list;
    }
}