Breaking out of an Infinite loop if user clicks a button

    That was helpfull but it brought up some new questions. Using Visual Cafe I can only get this program to execute as am application and not an applet. I modified the code that you sent me and this is what it currently looks like (all in one file):


import java.awt.*;
import java.applet.*;

 public class PriorityTester extends Applet implements Runnable
 {  
    public static void main(String argv[])
    {
        System.out.println("hello main");
        RunnablePottato aRP = new RunnablePottato();
        Thread t1 = new Thread(aRP, "onePottato");
        Thread t2 = new Thread(aRP, "twoPottato");

        t2.setPriority(t1.getPriority() + 1);
        t1.start();
        t2.start();
     }
 
    public void run()
    {
   
        while(true)
        {
            System.out.println("hello run");
            System.out.println(Thread.currentThread().getName());
            Thread.yield();

        }
    }
     
 }


   What is the the string arg thing in this program used for?

   When it comes time to write my real program it has these functions: init, run, calculate (does the mathematical operations for the model), handle event, paint and now main.

   Should my new program framework look like this so that the buttons can have higher priority than the calculations:


import ...

public class model extends Applet implements Runnable
{
   global variables

   public static void main(String argv[])
   {
      - handle event() and all the button functions
      - start()
   }

   init()
   
   run()

   calculate()

   repaint()

}


   Or does it matter if the handle event stuff is outside the main? If this is the case then how do you create a thread so that "it is connented" to the buttons.


Thanks alot



Louis Calisi
louiscal@bu.edu
 

First of all, main() is a method that is only valid in the context of an application.:-) In order to get it to run in applet, you can place the code contained in the main() method I sent you and place it either in the init() method, the start() method, or in a separate method that is called by one of these two.

For a good refresher on writting applets see:

http://www.mcp.com/que/et/se_java2e/15javafi.htm

and

http://www.mcp.com/que/et/se_java2e/16javafi.htm

String args[] is used by applications to be able to parse command line arguments. Say you invoke your Java app. as follows:

java copy file1 file2

then, args[0] will contain "file1" and args[1] will contain "file2".

It seems that the code I sent you acomplished to confuse you.

The purpose of the code was to give you a stand alone application that would aid you in determining if your OS has pre emptive or non premtive multitasking (threads). Based on that, you could use the same code to find priority settings that would work well under your plattform. (diferent plattforms work better with diferent settings).

The final reason I sent that block of code is that you can implement the techniques for setting priorities and calling the yield() method in your own code, with something that works as a referance.:-)

Using an application, rather than an applet, is a combination of kindliness and lazyness. An application does not need an HTML file and/or a web server to run, making using it eisier.


Have a look at the material for applets that I have refered to you, then look at:

http://www.inf.uni-hohenheim.de/top/java/tutorial/java/threads/index.html

for good info on threads. When your done reviewing all this info, you'll be prety close to mastering both subjects.

I'll be available to answer any further questions you might have on these subjects by e-mail at:

jkelleghan@usa.net

Feel free to ask away.