Vector

[Joey Alencar]

I'd like to know how can I implement a Vector (or anything like this) of a Class. It's like a array of a class.
Thanks.

[Bosun Bello]

Can you elaborate? Do you mean how to manipulate instances of your class using a vector or what?

Bosun

[Joey Alencar]

I have one class and I'd like to create a Vector (or array) of this class. I'd like to know how can I implement and manipulate this (input and get values).

[Mike Curwen]

Umm.. at the risk of being too obvious

Vector v = new Vector();
 
MyClass mc1 = new MyClass();
MyClass mc2 = new MyClass();
 
v.add(mc1);
v.add(mc2);

In this example, 'v' is a Vector containing instances of your class.

Did you mean that you wanted your class to *be* a Vector-like object? ie:

MyClass mc1 = new MyClass();
 
mc1.add(new String("hello"));
mc1.add(new String("world"));

In this case, you can extend Vector ie: "public class MyClass extends Vector"

[Joey Alencar]

OK, but how can I get the values of my class's variables using this Vector?

[Bosun Bello]

To get the values of your class variables, you need to cast the contents of the vector to the appropriate type, in this case your class type. You can use the enumeration interface to go through the vector.
for(Enumeration c = yourVector.elements(); c.hasMoreElements(); ){
yourClassType s = (yourClass) c.nextElement()
s.yourmethod/variable name
}
I hope this helps.


------------------
Bosun
SCJP for the Java� 2 Platform

[Colin Kenworthy]

Doesn't having:
yourClassType s = (yourClass) c.nextElement();
within a for loop create a new variable 's' each time you pass through the loop?
Or is the compiler smart enough to spot this and re-use 's' ??

[Kris Nelson]

The complier doesn't exactly 're-use' the same s object. When the iteration of the for loop is complete (at the end of the '}' ), the s object is eligible for garbage collection because it goes out of scope. Once its ready for gc, it's up to the JVM to discard it.

------------------
WebNelly.com
Java/XML Web Development
Check it out!
http://www.webnelly.com