Problem with JAVA program?

Question

I am using JAVA to simulate a water heater. For a switch I am using buttons, ON, OFF and EXIT. EXIT exits the program, OFF switches the heater off and On switches starts the heating and cooling process.

Basically, I want the heating and cooling process to be an infinite loop until another button is pressed. The problem right now is that when i start the cooling and heating process, the program does not accept any other buttons i press.

How can i break the loop once another button is pressed, no matter where the program is within the loop?

Fieyr ,
That is actually exactly what i did... but once it enters the loop, it will not let me press the off button, so therefore i cannot change the flag

I think that the problem with that code is that it stops listening and waits for a change in the flag inside the loop itself.... are there any other ideas??? anyone??

For future reference to whoever has this problem:

1) this is not programming 101
2) from what I can gather from other sources threading is the solution together with interuptions.

For further details look at http://java.sun.com/docs/books/tutorial/essential/concurrency/interrupt.html

Answer 1

You're going to want to use a class-level boolean flag as well as a while loop.

First initialize the class-level flag as..

priavate boolean heateron = false

Later in the code...BEFORE you enter the loop, your going to want to print a line of code that says "heating/cooling" and set the flag = to true

This code will be within the on button. Right after you output that code, enter the loop.

While(heateron == true)
{


}

The code will be stuck in a loop until you set the heateron variable to false. This code to kick you out of the loop would be in the off button.

Hope that helps.

Answer 2

This sounded like Programming 101 stuff, so I obviously won't recommend threading as a solution to that, you have to further refine the process into likes of 1% Heating, 2%, 3%... then interjects this infinite loop here with button recognition code.

I say this is Programming 101 because it sounded like the Washing Machine example back then.

Answer 3

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