Arrays within Classes

Programming Questions

jerome.be..

in Programming Questions • 1 year ago

Hi everyone,

I'm trying to pass/parse an array within a class as an argument in another class,

So ideally i'd be able to write (within a class);

void run(Array objectlist){

}

but this doesn't work as "Array" or "array" never seems to be used to specify an array is being created, that being done with;

Object[] objectlist = new Object[10];

If i use the object that holds the array, how can i direct processing to look for the array within the object? eg

void run(ObjectHoldingArray.objectlist myObjectList){

Or alternatively, how can i join two ArrayLists together?

Please let me know if i haven't made myself clear and thanks for any help in advance!

Replies(3)

amnon.owed

Re: Arrays within Classes

1 year ago

I think what you are looking for is: Object[] objectlist

Here is a pseudo-code example...

class FirstClass {
Object[] objectlist = new Object[10];
// other stuff
}
class SecondClass {
// other stuff
void run(Object[] objectlist) {
}
}
FirstClass firstInstance = new firstClass();
SecondClass secondInstance = new SecondClass();
secondInstance.run(firstInstance.objectlist);

Joining two arrayLists is something else entirely. But that can be done with addAll().

ArrayList listOne = new ArrayList();
ArrayList listTwo = new ArrayList();
listOne.addAll(listTwo);

PhiLho

As said, but don't use Object (which is a real Java class, the root of all classes) but the real name of your class.

" Or alternatively, how can i join two ArrayLists together?" Not sure how it is an alternative to your first question...

jerome.be..

Re: Arrays within Classes

1 year ago

amnon,

thanks for that, your second code snippet seems to work perfectly!

Phil, i have two arrayLists that i want to add together, and the only way to do that seemed to be to convert them into arrays and concatenate them, fortunately Amnon's second snippet looks like it'll avoid that same a load of time.

Thanks for your help guys.

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