public void saveSurvey(String txtFile) throws SecurityException, IOException {
		// creates a .txt file of a survey
		// .txt file will have name on first line
		// then from then on it will have type of question, followed by question text and then choices (if any)
		// then the answer
		// have to have type there because reader has to know if line determines next question or still choices, etc.
 
		// first create a writer output
		Writer output = null;
 
		// this is the actual text that will be written to the .txt file
		String text = this.name + "\n";
 
		for (int i = 0; i < this.numQues(); i++) {
			if (this.getQues(i).getType().equals("m/c") || this.getQues(i).getType().equals("t/f")
					|| this.getQues(i).getType().equals("matching") || this.getQues(i).getType().equals("ranking")) {
				text += this.getQues(i).getType() + "\n";
				text += this.getQues(i).getQuesText() + "\n";
				text += this.getQues(i).getLeftChoices() + "\n";
				text += this.getQues(i).getRightChoices() + "\n";
				text += this.getQues(i).getUserAns() + "\n";
			}
			else {
				text += this.getQues(i).getType() + "\n";
				text += this.getQues(i).getQuesText() + "\n";
				text += this.getQues(i).getUserAns() + "\n";
			}
		}
		File saveFile = new File(txtFile + ".txt");
		output = new BufferedWriter(new FileWriter(saveFile));
		output.write(text);
	    output.close();		
	}

public survey(String txtFile) throws SecurityException, IOException {
		// also sets tag as first one did
		type = "survey";
 
		// all the code for reading and parsing .txt file and setting up survey (loading)
		File file = new File(txtFile + ".txt");
	    FileInputStream fis = null;
	    BufferedInputStream bis = null;
	    DataInputStream dis = null;
 
	    // counter to read which line of the .txt file you are on
	    int counter = 0;
 
	    try {
	      fis = new FileInputStream(file);
 
	      // Here BufferedInputStream is added for fast reading.
	      bis = new BufferedInputStream(fis);
	      dis = new DataInputStream(bis);
 
	      // dis.available() returns 0 if the file does not have more lines.
	      while (dis.available() != 0) {
 
	    	  String lineText = dis.readLine();
 
	      // readLine() reads the line from the file and parses them
	      // counter will keep track of what line readLine() is on
	      // will load each line into the correct variables for the survey using its methods
	    	  if (counter == 0) {
	    		   this.setName(lineText);
	    		   counter++;
	    	  }
	    	  else {
	    		  if ((lineText.equals("m/c"))) {
	    			  mc newMC = new mc();
	    			  String text = dis.readLine();
	    			  newMC.setQuesText(text);
	    			  String lchoices = dis.readLine();
	    			  newMC.addLeftChoice(lchoices);
	    			  String rchoices = dis.readLine();
	    			  newMC.addRightChoice(rchoices);
	    			  String answer = dis.readLine();
	    			  newMC.setUserAns(answer);
	    		  }
	    		  else if ((lineText.equals("t/f"))) {
	    			  tf newTF = new tf();
	    			  String text = dis.readLine();
	    			  newTF.setQuesText(text);
 
	    			  // here there is always just T and F but the save function creates two empty lines
	    			  // just readLine() twice to get to the user answer
	    			  for (int i = 0; i < 2; i++) {
	    				  dis.readLine();
	    			  }
 
	    			  String answer = dis.readLine();
	    			  newTF.setUserAns(answer);
	    		  }
	    		  else if ((lineText.equals("matching"))) {
	    			  matching newMatching = new matching();
	    			  String text = dis.readLine();
	    			  newMatching.setQuesText(text);
	    			  String lchoices = dis.readLine();
	    			  newMatching.addLeftChoice(lchoices);
	    			  String rchoices = dis.readLine();
	    			  newMatching.addRightChoice(rchoices);
	    			  String answer = dis.readLine();
	    			  newMatching.setUserAns(answer);
	    		  }
	    		  else if ((lineText.equals("ranking"))) {
	    			  ranking newRanking = new ranking();
	    			  String text = dis.readLine();
	    			  newRanking.setQuesText(text);
	    			  String lchoices = dis.readLine();
	    			  newRanking.addLeftChoice(lchoices);
 
	    			  // right choices are just the numbers to be ranked which is in the constructor
	    			  // just perform one readLine() to get to next line
	    			  dis.readLine();
 
	    			  String answer = dis.readLine();
	    			  newRanking.setUserAns(answer);
	    		  }
	    		  else if ((lineText.equals("essay"))) {
	    			  essay newEssay = new essay();
	    			  String text = dis.readLine();
	    			  newEssay.setQuesText(text);
	    			  String answer = dis.readLine();
	    			  newEssay.setUserAns(answer);
	    		  }
	    		  else if ((lineText.equals("s/a"))) {
	    			  sa newSA = new sa();
	    			  String text = dis.readLine();
	    			  newSA.setQuesText(text);
	    			  String answer = dis.readLine();
	    			  newSA.setUserAns(answer);
	    		  }
	    	  }
	      }
 
	      // dispose all the resources after using them.
	      fis.close();
	      bis.close();
	      dis.close();
 
	    } catch (FileNotFoundException e) {
	      e.printStackTrace();
	    } catch (IOException e) {
	      e.printStackTrace();
	    }
 
	    // display the survey when it is done loading
	    this.displaySurvey();
	    // and save it
	    this.saveSurvey("newSurvey");
	}