recursion - Recursive toString binary tree output -


so want printout of binary tree read [a b c d e f] keep ending space , can't use substring remove it. best way approach this?

public string tostringinorder() {         output = "";         output += printinorder(root);         if(output.length() < 1) {             return "[]";         } else {             return "[" + output.substring(0, output.length() - 1) + "]";         }       }  private string printinorder(node current) {         if(current != null) {             printinorder(current.left);             output += current.value + " ";             printinorder(current.right);         }         return output;     }

if concern removing space @ end replace:

return "[" + output.substring(0, output.length() - 1) + "]";

with:

return "[" + output.trim() + "]";

another approach might take filling list ordered values, , can have greater control of how format ordered values string.


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