For loop problem

[dougie1809]

Hi,

I'm trying to for loop through creating initialized constructors with different values on thousands upon thousands of time.

My initial idea was creating constructors like so :

TCPScan tcp1 = new TCPScan(1,5);
TCPScan tcp2 = new TCPScan(6,10);
TCPScan tcp3 = new TCPScan(11,15);
.
.
.
TCPScan tcp65500 = new TCPScan(65531,65535);

But this will take a phenomenon amount of time.
So I was thinking could I do this in a for loop in creating TCPScan constructors with the different values to 65535 as I was trying to do?
Thanks much appreciated

The last initialized constructor 'TCPScan tcp65500 = new TCPScan(65531,65535);' was a guess,, but in around that range.

[JosAH]

Is the following induction correct? You want TCPScan objects for the values 5*i+1, 5*i+5 for i >= 0 and 5*i+5 <= 65535.

kind regards,

Jos

[dougie1809]

Yes, its alot more easier just to say TCPScan object actually. I think that could be a right induction. So would that be done within a nested for loop, or how can it be implemented?
Thanks

[JosAH]

Well, use a for-loop and, say, a List<TCPScan> and fill the list in the body of your loop with the correct TCPScan objects ...

kind regards,

Jos

[dougie1809]

Ok. I have the following snipped of code below which only has a for loop to create a TCPScan ArrayList. I can't get my head around on applying your induction into it, and im not sure what values I have to fill in assigning TCPScan objects into the list?
Thanks

//Loop through 1 to 65535..
		for(int i=1;i<=65535;i++)
		{
			//Create TCPScan object ArrayList
			ArrayList<TCPScan> tcpList = new ArrayList<TCPScan>(); 
		}

[/code]

[JosAH]

That fragment creates 65535 ArrayLists of TCPScan objects; that is not what you want; you want to create a single list of TCPScan objects and your loop has to create those TCPScan objects and add them to that single list.

kind regards,

Jos

[dougie1809]

Yes, that's a silly mistake. I have now created a single TCPScan ArrayList and then in the enhanced for loop I have TCPScan object being added to the tcpList, but I haven't specified the values based on your induction?
Thanks

//Create TCPScan object ArrayList
		ArrayList<TCPScan> tcpList = new ArrayList<TCPScan>();
		
		//Loop through the empy tcpList..
		for(TCPScan currentTCPScan : tcpList)
		{
			//Trying to add individual TCPScan object with different values
			tcpList.add(currentTCPScan); 
		}

[JosAH]

That list is empty, so your advanced for-loop has nothing to iterate over; try something like this:

List<TCPScan> list= new ArrayList<TCPScan>();
for (int i= 1; i <= 65531; i+= 5)
   list.add(new TCPScan(i, i+4));

kind regards,

Jos

[dougie1809]

Oh that works perfectly. Thanks alot :)
Two questions, how did you figure out to only loop as far as 65531? And what does the 'i+= 5' condition do?
Thanks

[JosAH]

Oh that works perfectly. Thanks alot :)
Two questions, how did you figure out to only loop as far as 65531? And what does the 'i+= 5' condition do?
Thanks

I guessed it from your original code (math folks call that 'induction') and 'i+= 5' adds the value 5 to the value of i and makes it the new value of i.

kind regards,

Jos