Writing a Java program to restrict applications based on time of day

Question

So I am making a program using Java that is going to close out of applications at certain times and allow them at certain times. For example, a game is only allowed from 5PM to 7PM. But I don't know how to make it so that it closes at the specific time and you can only open it at certain times. I have the rest of the code but not the permissions for the times. Your help is appreciated thanks,

Answer 1

You can use TimerTask for this purpose.

Example:

import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

public class ExitOn {

    Timer timer = new Timer();
    TimerTask exitApp = new TimerTask() {
        @Override
        public void run() {
            System.exit(0);
        }
    };

    public ExitOn() {
    timer.schedule(exitApp, new Date(System.currentTimeMillis()+5*1000));//Exits after 5sec of starting the app
    while(true)
        System.out.println("hello");
    }

    public static void main(String[] args) {
        new ExitOn();
    }

}

Sample Code found here

Answer 2

import java.util.Scanner;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;



public class Test {
    private static Scanner scanner;

    public static void main(String[] args) throws Exception {
        ScheduledExecutorService ex = Executors.newScheduledThreadPool(2);
        ex.scheduleAtFixedRate(new Start(),  0 , 24, TimeUnit.HOURS);
        ex.scheduleAtFixedRate(new End(),  2 , 24, TimeUnit.HOURS);
        scanner = new Scanner(System.in);
        while(true){
            if(scanner.hasNext() && "Q".equals(scanner.next())){
                System.exit(0);
            }
            Thread.sleep(10000);
        }
    }
}

class Start implements Runnable{

    @Override
    public void run() {
        //start your game
    }

}

class End implements Runnable{

    @Override
    public void run() {
        //shutdown your game
    }

}

---

As jwenting mentioned, you also want to kill or start a program or just change the permission of a game.

Here is the link to kill a process in windows. Hope it can help. How to find and kill running Win-Processes from within Java?

To avoid a game being started, I have no idea yet.

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The java 7 provide new functions to change the permissions of a file. Could this can help you set the permission of a file in special time.

Path file = ...;  
Set<PosixFilePermission> perms = PosixFilePermissions.fromString("rw-------");  
FileAttribute<Set<PosixFilePermission>> attr = PosixFilePermissions.asFileAttribute(perms);  
try {  
    Attributes.setPosixFilePermissions(file, perms);  
} catch (IOException x) {  
    System.err.println(x);  
}