Thread: 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

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?

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