Generate permutation of string

Permutation:

each of several possible ways in which a set or number of things can be ordered or arranged. 

public class permutation {

  void    doPermutation(char [] str,int i,int n){

       if (i==n) {

          for (int m = 0; m < str.length; m++) {

       System.out.print(str[m]);

          }

          System.out.println("");

    

     }

       else{

            for (int j = i; j <=n; j++) {

                //swap str[i] and str[j]

                 char ch=str[i];

                 str[i]=str[j];

                 str[j]=ch;

                 doPermutation(str, i+1, n);

                 //swap str[i] and str[j]

                 ch=str[i];

                 str[i]=str[j];

                 str[j]=ch;

          }

       }

         

     }   

     public static void main(String[] args) {

    

          String str1="abc";

          permutation obj=new permutation();

          char []str=str1.toCharArray();

          obj.doPermutation(str,0,(str.length-1));       

     }

    

}

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