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Thread: Funny Behaviour

  1. #1
    Member
    Join Date
    Jan 2013
    Location
    Central Texas
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    Default Funny Behaviour

    Here is a little program I wrote to help me memorize my student ID #. I will * out the actual number but here is my code.
    import java.util.Scanner;
    class baylorID {
    	public static void main(String[] args){
    		//clear the console
    		System.out.print("\033[H\033[2J");
    		System.out.flush();
     
    		//store correct baylor id in a string
    		String correctID = "*********";
    		String inputID = new String();
    		String quit = "quit";
    		int numCorrect = 0;
    		int numIncorrect = 0;
    		int netCorrect = 0;
     
    		//ask user for student id
    		while (netCorrect < 10) {
    			System.out.print("\033[H\033[2J");
    			System.out.flush();
    			Scanner scan = new Scanner(System.in);
    			System.out.println("What is your Student ID? \t Type 'quit' to exit.");		
    			inputID = scan.next();
     
    		//compare the two
    			if (inputID.equals(quit)) {
    				numCorrect = 12;
    				numIncorrect = 1;
    			}
    			if (inputID.equals(correctID)) {
    				System.out.println("Correct! You remembered it!");
    				numCorrect += 1;
    				System.out.println(numCorrect);
    			} else {
    				System.out.println("Incorrect. Try Again.");
    				numIncorrect += 1;
    				System.out.println(numIncorrect);
    			}
    			netCorrect = numCorrect - numIncorrect;
    		}
    	}
    }

    It compiles and runs successfully. However, when I type quit, it does not do what I want.

    What I Want:
    The program to stop running

    What Happens:
    What is your Student ID? 	 Type 'quit' to exit.
    quit
    Incorrect. Try Again.
    2
    Then it stops running


  2. #2
    Member
    Join Date
    Sep 2012
    Posts
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    Default Re: Funny Behaviour

    I'm not sure why you need to "clear the console". I believe you may be confusing the scanner with the buffered writer class.

    As far as i know you just need to close it after use with scan.close()

    Try and declare the scanner at the top, so it has scope beyond the while loop.

    What does System.out.print("\033[H\033[2J"); do?

    One you have looked at the above, I think you need to review this part of the code:

    //compare the two
    			if (inputID.equals(quit)) {
    ...
    }

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