Write a recursive method using Java that takes a string s as input and returns a...

Write a recursive method using Java that takes a string s as input and returns a list that contains all the anagrams of the string s. An anagram is a word formed by rearranging the letters of a different word. For instance, the word ‘cat’ is an anagram of ‘act’. Notice that the output list cannot contain duplicates.

Expert Solution

import java.util.*;

//Created class anagram
public class Anagram {
        //Adding hashset to remove all duplicates
         HashSet<String> set=new HashSet(); 
         //Recursion method for anagram
    public HashSet<String> anag(String s1, String s2)  {
        if(s1.length() == 0)    {
                set.add(s2);
        }
        for(int i = 0; i < s1.length(); i++) {
            anag(s1.substring(0, i) + s1.substring(i+1, s1.length()), s1.charAt(i) + s2);
        }
                return set;

    }
    public static void main(String[] args)  {
        //Object for class anagram
        Anagram ana = new Anagram();
        String word; 
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter a word: ");
        word=scan.nextLine();
        System.out.println("The anagrams are: ");
        HashSet<String> set=ana.anag(word, ""); 
        //Iterator for hashset
        Iterator<String> i=set.iterator();  
        while(i.hasNext())  
        {  
        System.out.println(i.next());  
        }  
    }
}

Sample input and output:

Enter a word: cat
The anagrams are:
atc
cta
tca
act
tac
cat

Enter a word: liril
The anagrams are:
lliri
lrili
rilil
rlili
ilrli
ililr
ilirl
illri
liril
lilir
irill
irlli
lriil
lrlii
liirl
riill
rilli
lilri
ilril
illir
rliil
iirll
rllii
iillr
lirli
liilr
llrii
lliir
irlil
iilrl

venereology answered 2 years ago

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