Declare an ArrayList named taxRates of * five *elements of type Double and initialize the elements (starting with the first) to the values 0.10 , 0.15 , 0.21 , 0.28 , 0.31 , respectively.
I tried:
double taxRates[5] = {0.10, 0.15, 0.21, 0.28, 0.31};
Welcome to the Java Programming Forums
The professional, friendly Java community. 21,500 members and growing!
The Java Programming Forums are a community of Java programmers from all around the World. Our members have a wide range of skills and they all have one thing in common: A passion to learn and code Java. We invite beginner Java programmers right through to Java professionals to post here and share your knowledge. Become a part of the community, help others, expand your knowledge of Java and enjoy talking with like minded people. Registration is quick and best of all free. We look forward to meeting you.
>> REGISTER NOW TO START POSTING
Members have full access to the forums. Advertisements are removed for registered users.
LinkBack URL
About LinkBacks
Please help ArrayList Question
Declare an ArrayList named taxRates of * five *elements of type Double and initialize the elements (starting with the first) to the values 0.10 , 0.15 , 0.21 , 0.28 , 0.31 , respectively.
I tried:
double taxRates[5] = {0.10, 0.15, 0.21, 0.28, 0.31};
Re: Please help ArrayList Question
That's an array, not an ArrayList.
Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
Static Void Games - Play indie games, learn from game tutorials and source code, upload your own games!
Re: Please help ArrayList Question
What does that mean?
Re: Please help ArrayList Question
Re: Please help ArrayList Question
An ArrayList is an Object that holds a variable amount of other Objects.
An array is a container that holds a fixed number of Objects or primitives.
They aren't the same, and what you've supplied doesn't match your title, so some clarification is necessary.
Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
Static Void Games - Play indie games, learn from game tutorials and source code, upload your own games!
Re: Please help ArrayList Question
Additional to Kevin's answer: Well, in easy words though
1. Arrays are non resizable
2. Arrays store only single data type values(Say Elements).
3. ArrayLists are resizable.
4. ArraLists can store multi data type values(Say Objects).
Re: Please help ArrayList Question
I just woke up and I haven't tested this, but couldn't you store multiple types in an array by doing something like this:Originally Posted by Mr.777
Additional to Kevin's answer: Well, in easy words though
1. Arrays are non resizable
2. Arrays store only single data type values(Say Elements).
3. ArrayLists are resizable.
4. ArraLists can store multi data type values(Say Objects).
Object[] objs = {new Object(), "cats", 7};
Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
Static Void Games - Play indie games, learn from game tutorials and source code, upload your own games!
Re: Please help ArrayList Question
Well, arrays of primitive types, not of some defined objects.
Re: Please help ArrayList Question
I'm still not sure I agree with that. Arrays definitely can contain primitives (whereas ArrayLists can only contain Objects, including wrapper classes for primitives). But arrays can also contain Objects, like I showed above, right?
Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
Static Void Games - Play indie games, learn from game tutorials and source code, upload your own games!
Re: Please help ArrayList Question
What do you say about this?int [] arr = new int[10];
Re: Please help ArrayList Question
Like I said, arrays definitely CAN contain primitives, but they don't HAVE to. They con contain Objects as well. So to say the can only contain a single data type is not correct. I don't want to be pedantic, but the OP seems extremely confused already, so I don't want to confuse him even more.
Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
Static Void Games - Play indie games, learn from game tutorials and source code, upload your own games!
Mr.777 (November 14th, 2011)
Re: Please help ArrayList Question
Oh yeah if this is the fact then yes arrays can have multiple types. So, ignore the point, Arrays can store only single type elements.
So Kevin, don't you think, elements and objects are different things?
Re: Please help ArrayList Question
It depends what you mean by "elements". Objects can be elements in an array or an ArrayList. But if you mean "primitives" instead of "elements" then yeah, Objects and primitives are different.
Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
Static Void Games - Play indie games, learn from game tutorials and source code, upload your own games!
Re: Please help ArrayList Question
Yes that is fine. What Kevin is questioning is the following statement made by you:
2. Arrays store only single data type values
Which is incorrect! Arrays can most certainly hold elements of different data types as long as they are subclasses of a superclass. Just as Kevin demonstrated above
Bah! Page 2.
Improving the world one idiot at a time!
KevinWorkman (November 15th, 2011), Mr.777 (November 14th, 2011)
Re: Please help ArrayList Question
Alright Kevin. Thanks. Well, atleast i got some new knowledge coz of you.
Thanks alot.
Thanks Junky.
Reply With Quote