java - Trying to create a palindrome...how can I compare the "output.charAt(k)" to original "output" String? -

public static void main(string[] args) {     string input = new string(joptionpane.showinputdialog("enter string."));     string inputlow = input.tolowercase();      string output = "";     //blank string     for(int = 0; < inputlow.length(); i++)  //for loop continue through entered string     {         if(inputlow.charat(i) >= 'a' && inputlow.charat(i) <= 'z')  //if statement check appropriate characters         {             output += inputlow.charat(i);   //add appropriate characters string output ('a' - 'z')         }     }     system.out.println(output);      //getting reverse string     int n = output.length() - 1;     string last = "";     for(int k = n; k >= 0; k--)     {         system.out.print(output.charat(k));         //last = string.valueof(output.charat(k));     }     //system.out.println(""); //system.out.println(last); } 

so trying print string last when un-comment code outputs this:

heyman namyeh h 

but want print "heyman" on third line. (i doing print statements test if doing correctly, , goal compare string last string output , if same palindrome, otherwise it's not.)

how can method (or it)?

you're setting value of last 1 character @ time. you're resetting every time, why ends on last character of reversed string (which first character).

change last = string.valueof(output.charat(k)) + last;