java - Performing Recursion inside For loop -


i trying understand code of writing permutations given input string.

for example: input string:123,output:123,132,213,231,312,321.

below pasted code snippet that.

 public static void main(string args[]) {      permutestring("", "123");    }  public static void permutestring(string beginningstring, string endingstring) {     if (endingstring.length() <= 1)         system.out.println(beginningstring + endingstring);     else         (int = 0; < endingstring.length(); i++) {             try {                  // system.out.println(i);                 string newstring = endingstring.substring(0, i) + endingstring.substring(i + 1);                 permutestring(beginningstring + endingstring.charat(i), newstring);             } catch (stringindexoutofboundsexception exception) {                 exception.printstacktrace();             }         }

i getting confused when integer 'i' gets incremented in loop i.e i=0 1. 1 thing understood first iteration 'i' got incremented 1 when hit base case i.e

   if (endingstring.length() <= 1)         system.out.println(beginningstring + endingstring);

i tried debug further , value kept on changing between 0 , 1 successive iterations couldn't understand.

to sum-up, confused regarding relationship between "for loop" , 2 instructions in try block after first iteration.

i happy if 1 can guide me through process.

i tried elaborate as can drawing hope helpful. recursion doesn't need try-catch block, can remove , work fine

enter image description here


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