This discussion is for posting problems/answers with regard to Project 3

You could use the mod operator and then just check the remainder. If there is a remainder, it didn't go in an even number of times (not a multiple). For example, x=88%2 would result in x being set to zero, while x-89%2 would result in it being set to 1. Since you're working with whole numbers anyway, the only fractions you would get would be quotients and you don't need those except to determine whether the number goes in an even number of times or not. If the result of the mod operation is anything other than zero, then the divisor didn't go into the dividend an equal number of times.

It looks like a for loop whereas what you really seem to want is a while loop. A for loop requires 3 things, the condition, the counter, and the increment. Substitute a "while" for the "for" and see what happens.

for now I have a static variable acting as a counter of all the threads running. Whenever a thread is started (within main) i increment the counter, and whenever a thread is finished (inside the run() method) i decrement it. Before my loop that prints the results, i just have an empty loop:

while(threadsRunning > 0) { }

so that main does not go on to execute the rest of the code until all threads have finished.
I don't know if there is a more efficient way to solve this problem though.

Off the top of your head, is there anything that stands out that would cause a "reached end of file while parsing" error? I'm getting it at the last ' } ' of my code.

I'm getting the same error also. I'm using netbeans and its always the last close bracket thats "wrong" as if i don't have enough brackets. Not sure how to fix it. Its a date, Prof Garrett, see you Friday 9AM.

found my problem, had my void main setup wrong.

found the extra ; in the if statement - over looked it before

^ 2.0 ^

~~~~~~~~~~~~~~

public static ArrayList listOfStartedThreads = new ArrayList();

~~~~~~~~~~~~~~
//in the loop that creates threads

listOfStartedThreads.add((Integer)i);

~~~~~~~~~~~~~

for (p=0; p<listOfStartedThreads.size(); p++)
{

if (primeNumThreadNumber[java.lang.Integer.parseInt(listOfStartedThreads.get(p).toString())].isAlive())
{
primeNumThreadNumber[p].join();
}

in order to use sleep(int) is there a package you have to import or something? I get a syntax error when i try to use it.

danny
i think you need a == instead of a single =
what your doing is setting everything to true in that statement
see if that helps
kevin

So I've got most of my code written the way I want it to work, however I am running into a problem that I can't seem to find a solution for in my searching through numerous Java educational sources.
My code basically does what I think most others do, which is I've created a loop and a thread is created and started each time through that loop. The problem is that I don't know how to get my thread objects to have unique names
Code goes something like this:
for (int j = 0; j < primes.length; j++){
if (primes[j] == true){
Thread ***** = new Primer();
*****.start();
}
}
Where the ***** represents the various code I need to put in to create these thread objects, but also make each one have their own name so that the compiler doesn't get pissed at me. (Note: Primer() is the name of my class that extends Thread and contains the run() method). Any thoughts on what simple or complicated solution I am missing would be appreciated.

I didn't have to import anything for this program, and to add the sleep(1); i used in my waiting loop in main all i had to do inclose the loop in a try and add a catch InterruptedException section (that is empty)