Runtime Error in Hangman App

Question

Good evening all,
I have written the following code for a CS assignment. All seems well except for a few issues with the alignment of the ASCII art but I am still tweaking it a bit. The major problem is if the user presses the enter button instead of using the mouse several body parts are shown regardless if the letter entered is part of the hidden word or not. It doesn't do it with each word but only every other one. I'd appreciate being pointed in the right direction so I can get it to run either way (enter and/or mouse). Thanks in advance.
import java.util.*;
import javax.swing.*;
public class Hangman
  public static void main (String [] args)
    //declaration of variables
    boolean playing = true;      // true while playing game
    boolean correct = false;     // false when ending game  
    int i;                       // temp variable for index loop
    int length;                  // length of secret word
    int guessRemaining;          // wrong guesses remaining
      String c = "";               // temp variable for character
    String word;                 // secret word
    String hiddenLetters = "";   // use to hide letters of word
      String wrongLetters = "";    // letters not in secret word
    String temp = "";            // temp variable for Strings     
    guessRemaining = 6;          // start w/ no wrong guesses
    word = JOptionPane.showInputDialog(null, "Enter the secret word.");   
    length = word.length();      // Player 1 enters a word.
    for (i=0; i < length; i++)
      hiddenLetters = hiddenLetters + "-";  // Letters of hidden word replaced with -
    while (playing == true){     // Player 2 begins game
           correct = false;
      if (guessRemaining==6){       
        c = JOptionPane.showInputDialog(null,"\t---------- \n\t |    |   \n\t |      \n\t |  \n\t | \n\t   | \n\t=======\n"+
                                            wrongLetters + "\n"+ hiddenLetters);
      if (guessRemaining==5)
        c = JOptionPane.showInputDialog(null,"\t---------- \n\t |    | \n\t |     () \n\t |  \n\t | \n\t   | \n\t=======\n"+
                                            wrongLetters + "\n"+ hiddenLetters);
      if (guessRemaining==4)
        c = JOptionPane.showInputDialog(null,"\t---------- \n\t |    | \n\t |   () \n\t |       | \n\t   | \n\t | \n\t=======\n"+
                                            wrongLetters + "\n"+ hiddenLetters);
      if (guessRemaining==3)
        c = JOptionPane.showInputDialog(null,"\t---------- \n\t |    | \n\t |   () \n\t |       |--\n\t  | \n\t | \n\t=======\n"+
                                            wrongLetters + "\n"+ hiddenLetters);
      if (guessRemaining==2)
        c = JOptionPane.showInputDialog(null,"\t---------- \n\t |    | \n\t |   () \n\t |     --|-- \n\t | \n\t | \n\t | \n\t=======\n"+
                                            wrongLetters + "\n"+ hiddenLetters);
      if (guessRemaining==1)
        c = JOptionPane.showInputDialog(null,"\t---------- \n\t |    | \n\t |   () \n\t |     --|-- \n\t | \n\t | \n\t | \n\t=======\n"+ 
                                            wrongLetters + "\n"+ hiddenLetters);
      if (guessRemaining==0){
          JOptionPane.showMessageDialog(null,"\t---------- \n\t |    | \n\t |   () \n\t |     --|-- \n\t |      | \n\t | \n=======\n\n+YOU'VE BEEN\n    HANGED!!!\n"+ wrongLetters + "\n"+ hiddenLetters);
          playing = false;
      for (i = 0; i < length; i++)       
        if (hiddenLetters.charAt(i)!= '-'){             // '-' replaced w/ correct letter
          temp = temp + hiddenLetters.charAt(i);}
        else if (word.charAt(i)==c.charAt(0)){
          temp = temp + c.charAt(0);
          correct = true;
        else {
         temp = temp + "-";
      hiddenLetters = temp;
      temp = "";
      if (correct == false){
        wrongLetters = wrongLetters + c;
        guessRemaining = guessRemaining - 1;
      if (hiddenLetters.equals(word)){
        JOptionPane.showMessageDialog(null, "Awesome Job! You Won The Game!");
        playing = false;
}// End program

Answer 1

Flounder,
I guess I should have been more explicit in my question. I certainly wasn't looking for someone to fix the code for me or spoonfeed me the answer. I was only wanting to be pointed in the right direction about how to deal with this. I haven't encountered this type of error before and after testing it over 50 times and trying everything I've learned in the past few months and doing a search on here and reviewing the tutorials I was still stuck. Sorry about that. Thanks for the info and the advice regarding the other line of code. I really do appreciate the help.