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Thread: My while (true) loop method only seems to run once!

  1. #1
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    Default My while (true) loop method only seems to run once!

    Hi guys,

    I've recently written a block of code to serve as an internal integer-based clock for another program I'm using.

    public class WorldTime
    {
        public String gametime;
        final int sunrise = 600;
        final int sunset = 1800;
        public int timevalue = 0;
        public Boolean isnight;
        public Boolean isday;
        public Boolean issunrise;
        public Boolean issunset;
        public Boolean runclock;
     
        public int currentTime()
        {
            while (true)
            {
     
                try 
                {
                    Thread.sleep(1000);
                }
     
                catch (InterruptedException timevalue)
                {
     
                }
     
                if (timevalue == 2400)
                {
                    resetTime();
                }
     
                else
                {
                    timevalue++;
                }
     
               return timevalue;
            }
        }

    There are a lot more other methods in the class, but this is the only one I'm interested in for this question.

    Now, to test that this counting system is working, I created a dummy program to merely test to method value to see if this method was working.

    public class TimeTest 
    {
        public static int cool;
     
        public static void main(String args[])
        {
            WorldTime base = new WorldTime();
            cool = base.currentTime();
            testRun();
        }
     
        public static void testRun()
        {
            Scanner scan = new Scanner(System.in);
            int x = scan.nextInt();
     
            int y = new WorldTime().currentTime();
     
            if (x > 0)
            {
                try 
                {
                    Thread.sleep(5000);
                }
     
                catch (InterruptedException timevalue)
                {
     
                }
     
                System.out.println("The program's time is: " + cool);
            }
        }
    }

    The code compiles easily.

    I have it sleep for 5 seconds to see if the counting method works. However, the output is always "1", regardless of how long the sleep value is, or how long I wait to input an x value.

    What's going on here? I'm not exactly a java expert, but I have enough experience writing code that I thought this should work.

    Thanks in advance!


  2. #2
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    Default Re: My while (true) loop method only seems to run once!

    Quote Originally Posted by ajfonty View Post

            while (true)
            {
     
    ...
     
               return timevalue;
            }
        }
    What do you think the return does? Follow the code you have through - it looks pretty straightforward that it will only execute once.
    Need Java help? Check out the HotJoe Java Help forums!

  3. #3
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    Default Re: My while (true) loop method only seems to run once!

    You return a value in your loop. Whenever you return something, all of the execution afterwards is ignored.

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