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Thread: How to limit scanner time and stop it with a condition

  1. #1
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    Default How to limit scanner time and stop it with a condition

    Hello,

    For a game, I have differents times of input :

    -first : 1 or 2 or 3
    -second : 1 or 2
    -third : 0 to 7 or 8

    I want to know how to limit the time that one scanner will be "display" ?
    How to stop it, if the input is equal at 1 or 2,for exemple ?

    Maybe, if I make a class step which will represent the step of input, I will only make a switch, but I don't know what to put inside...

    For the moment, I only have a basic scanner method :
    		private static int result()
    		{
    			int res = -2;
    			try
    			{
    				Scanner touche = new Scanner(System.in);
    				String lettre = touche.nextLine();
    				res = Character.getNumericValue(lettre.charAt(0));
    			}
    			catch (java.lang.StringIndexOutOfBoundsException exception)
    			{
    			}
    			return res;
    		}

    The notion of time is only missing, can you help me ?

    Thanks


  2. #2
    Super Moderator jps's Avatar
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    Default Re: How to limit scanner time and stop it with a condition

    I want to know how to limit the time that one scanner will be "display" ?
    Show me how you "display" a scanner. I do not know what that means.

    Are you using the Timer class?

  3. #3
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    Default Re: How to limit scanner time and stop it with a condition

    Hello,

    Display is like time of activate or time that the user can input something.
    With one of your previous thread, a made a little code :
    import java.util.Scanner;
    import java.util.Random;
     
    public class TimedScanner implements Runnable
    {
     
    	private Scanner scanner;
    	private StringBuilder buffer;
    	private boolean reading;
    	static Thread t;
     
    	public TimedScanner()
    	{
    		scanner = new Scanner(System.in);
    		buffer = new StringBuilder();
    		reading = false;
    		t = new Thread(this);
    		t.setDaemon(true);
    		t.start();
    	}
     
    	public String nextLine(long time)
    	{
    		reading = true;
    		String result = null;
    		long startTime = System.currentTimeMillis();
    		while (System.currentTimeMillis() - startTime < time && result == null)
    		{
    			try
    			{
    				Thread.sleep(30);
    			}
    			catch (InterruptedException e)
    			{
    			}
    			synchronized (buffer)
    			{
    				if (buffer.length() > 0)
    				{
    					Scanner temp = new Scanner(buffer.toString());
    					result = temp.nextLine();
    				}
    			}
    		}
    		t.interrupt();
    		reading = false;
    		return result;
    	}
     
    	@Override
    	public void run()
    	{
    		while (scanner.hasNextLine())
    		{
    			String line = scanner.nextLine();
    			synchronized (buffer)
    			{
    				if (reading)
    				{
     
    					buffer.append(line);
    					buffer.append("\n");
     
    				}
    				else
    				{
    					// flush the buffer
    					if (buffer.length() != 0)
    					{
    						buffer.delete(0, buffer.length());
    					}
    				}
    			}
    		}
    	}
    }
     
    public class Solitaire {
     
    		private static int etapeSaisieJeu;
     
    		private static  int getRandomInt(int limite) {  
    		    return (new Random()).nextInt(limite) ;  
    		} 
    		private static int resultatSaisieUtilisateur()
    		{
    			int res = -2;
    			long tempsDebut = System.currentTimeMillis();
    			switch(etapeSaisieJeu)
    			{
    			case 1 : res = fiabilisationSaisie(1,2,3,-1,-1,-1,-1,-1,-1); break;
    			case 2 : res = fiabilisationSaisie(1,2,-1,-1,-1,-1,-1,-1,-1);break;
    			case 3 :if(typePlateau == 1)
    					{
    						res = fiabilisationSaisie(0,1,2,3,4,5,6,-1,-1);
    					}
    					else if(typePlateau == 2)
    					{
    						res = fiabilisationSaisie(0,1,2,3,4,5,6,7,-1);
    					}
    					else 
    					{
    						res = fiabilisationSaisie(0,1,2,3,4,5,6,7,8);
    					}
    					 break;
    			case 4 : res = fiabilisationSaisie(2,4,6,8,-1,-1,-1,-1,-1);break;
    			default : break;
    			}
    			long tempsFin = System.currentTimeMillis();
    			calculDifferenceDeTemps(tempsFin,tempsDebut,0);
    			return res;
    		}
     
    		private static int fiabilisationSaisie(int valeurAttendue1,int valeurAttendue2,int valeurAttendue3,int valeurAttendue4,int valeurAttendue5,int valeurAttendue6,int valeurAttendue7,int valeurAttendue8,int valeurAttendue9)
    		{
    			int res = -2;
    			try
    			{
    				//TimedScanner scanner = new TimedScanner();
    				//String lettre = scanner.nextLine(10000);
    				Scanner sc = new Scanner(System.in);
    				String lettre = sc.nextLine();
    				System.out.println("a"+lettre+"a");
    				if (lettre == null)
    				{
    					System.out.println("More faster, next time");
    					res = correctionSaisie(valeurAttendue1,valeurAttendue2,valeurAttendue3,valeurAttendue4,valeurAttendue5,valeurAttendue6,valeurAttendue7,valeurAttendue8,valeurAttendue9);
    				}
    				else
    				{
    					res = elementAUnePositiondonnee(lettre,0);
    					//TimedScanner.t.interrupt();
    				}
    			}
    			catch (java.lang.StringIndexOutOfBoundsException exception)
    			{
    			}
    			return res;
    		}
     
    		private static int correctionSaisie(int valeurAttendue1,int valeurAttendue2,int valeurAttendue3,int valeurAttendue4,int valeurAttendue5,int valeurAttendue6,int valeurAttendue7,int valeurAttendue8,int valeurAttendue9)
    		{
    			int res = -1;
    			int max = Math.max(valeurAttendue1, Math.max(valeurAttendue2, Math.max(valeurAttendue3,Math.max(valeurAttendue4,Math.max(valeurAttendue5, Math.max(valeurAttendue6,Math.max(valeurAttendue7,Math.max(valeurAttendue8,valeurAttendue9))))))));
    			if ((res != valeurAttendue1) || (res != valeurAttendue2) || (res != valeurAttendue3) || (res != valeurAttendue4) || (res != valeurAttendue5) || (res != valeurAttendue6) || (res != valeurAttendue7) || (res != valeurAttendue8) || (res != valeurAttendue9))
    			{
    				res = getRandomInt(max);
    			}
    			return res;
    		}
     
    		public static void main (String[] args)
    		{
    			int res = -2;
    			etapeSaisieJeu = 1
    			res= resultatSaisieUtilisateur();
    			System.out.println(res);
    			etapeSaisieJeu = 2
    			res= resultatSaisieUtilisateur();
    			System.out.println(res);
    			etapeSaisieJeu = 3
    			res= resultatSaisieUtilisateur();
    			System.out.println(res);
    			etapeSaisieJeu = 4
    			res= resultatSaisieUtilisateur();
    			System.out.println(res);
    		}
    }

    Now, I think that the thread t is always alive when I put something. Because for the first time of scanner, all is good. But after, If I enter 10 times the same value, my string lettre, is always null.

    Thanks you for your help

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