I have been trying for 3 hours and there must be something that I am missing.
I can get it to remove something from the spot lets say 3, but I cannot get it to remove all items in the list that are of the length 3. Anyone have an idea of what I may be doing wrong? Can I use something like:
myList.remove(myList.length(3)); ?
I jsut cant get it.
you wouldnt need to literally move everything up if you are using an Iterator..
List array = new ArrayList<String>();
array.add("string 1");
array.add( "boo");
Iterator<String> itr = array.iterator();
while(itr.hasNext())
{
if(itr.next().length() >= 3)
itr.remove();
}
Something like that will work..
Hehe, I didn't take it as critism more of sarcasm if it can even be used there :P
I understand what your saying but like usual I have a problem translating that into code.
What I think your saying is something like:
for (int i = 0 ; i < myList.size(); i++)
{
if (myList.get(i) = length(3))
myList.remove(i);
}
?
> Hehe, I didn't take it as critism more of sarcasm if
> it can even be used there :P
>
> I understand what your saying but like usual I have a
> problem translating that into code.
>
> What I think your saying is something like:
>
> > for (int i = 0 ; i < myList.size(); i++)
> {
>if (myList.get(i) = length(3))
>myList.remove(i);
> }
>
Apparently your instructor is not teaching you very well...
length() is a method used by arrays or strings etc and has NO variables..
To correct your code:
for (int i = 0 ; i < myList.size(); i++)
{
if (myList.get(i).length() == 3)
myList.remove(i);
}
I tried
for (int i = 0 ; i < myList.size () ; i++)
{
if (myList.get (i).length () == 3)
myList.remove (i);
AND
String x = (String) myList.get (i);
if (x.length () == len)
myList.remove (i);
}
It isn't sinking in and I cant figure out Iterators enough to get that code he gave me to work :(
Ok, I get it now why I would need it backwards. But for
for (int i = myList.size () - 1 ; i >= 0 ; i--)
{
if (myList.get (i).length () == 3)
myList.remove (i);
}
(#7 was my post so i figured it was the next one)
it says "No method named "length" was found in "java.lang.Object".
Which I do believe just means I cant use length that way.
I havent read this entire thread, but Im assuming myList exclusively holds String objects. THe problem is you need to cast the object from the list before you use the length() method (because String has lenght(), not Object).
so adjust your loop accordingly:
String s;
for (int i = myList.size()-1 ;i >= 0 ;i--) {
s = (String)myList.get(i);
if (s.length() == 3)
myList.remove(i);
}
}
for (int i = myList.size () - 1 ; i >= 0 ; i--)
{
String s = (String) myList.get (i);
if (s.length () == len)
myList.remove (i);
}
worked anyways.
Thank you everyone for lending many different ways to do this. I came out knowing more than I thought I would get out of it.
> casting sucks.. should use
>
> ArrayList myList = new ArrayList<String>();
>
> casting gets annoying.. and takes up space
So does declaring a concrete type unnecessarily.
List<String> myList = new ArrayList<String>();
That's better. Although I would advise the original poster to ignore this. Introducing generics to you when you're having trouble with much more fundamental and simple concepts probably isn't going to serve you well.
