为什么我的最后一个元素不打印？

Question

I'm on the last steps of finishing my BST and Trie in java and I've come across this problem. I can't print the last element out to a file. It's not the toString methods cause I've tried switching them around. I remember a while back one of my professors mentioned something about closing the file. Something along the lines of putting an int value inside the parentheses of the close method, I'll develop on this below (not sure if I'm right thought, just something I vaguely recall) Here's a snippet of the code that I'm having trouble with.

       try{
           output = new PrintWriter(inputFile);

           output.println("BST:");
           output.println(tree.toString());
           output.println("Trie:");
           output.println(trie.myToString());


           output.close();

        }
           catch(IOException e){}
        System.out.println("Goodbye");    

so if I recall correctly, the teacher said to do something like output.close(0) or the like, but it's shooting me errors. Can anyone help me with this? Thank you.

Answer 1

catch(IOException e){}

you are swallowing the reason here. Don't do that.

At least print the reason with

catch(IOException e) {
  e.printStackTrace(System.err);
}

Answer 2

try

output.flush()

before close the output

or try

  output = new PrintWriter(inputFile,true);