Permutation of a number

Find all permutation of a number
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 swap[j]
               char ch=str[i];
               str[i]=str[j];
               str[j]=ch;
               doPermutation(str, i+1, n);
               // swap str[i] and swap[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));       
    }
   
}
==========================
Output:
abc
acb
bac
bca
cba
cab

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