Access object within an array

Question

So i'm trying to access an attribute of a class object within an array.

document doc1 = new document(1,"Introduction to Java", "Ahmed Raya", "Summary of doc1","History of Java.docx");  
document doc2 = new document(2,"Object Oriented Programming", "Ahmed Raya", "Summary of doc2","Document2.pdf");
Object[] docary = {doc1, doc2};

I have an open(directory) function that takes the directory of an object (for example doc1's directory is "History of Java.docx". What i'm trying to do is access the directory attribute of an object within the docary array.
This is basically what i want to do: open(docary[k].directory);where k is an integer variable inputted by the user. How can i do this?
Thanks

Kon · Accepted Answer · 2015-01-30 15:34:01Z

2

Change the reference type of your declaring array to document. Also, consider renaming your document class to Document to better follow Java naming conventions. See the Google Java Style Guide for more formatting info.

document[] docary = {doc1, doc2};
docary[0].directory(); //etc

answered Jan 30, 2015 at 15:34

Kon

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1 Comment

DeadlyJesus Over a year ago

Note that he could also cast docary[k] to the document type like this: open((document) docary[k].directory)if he need the array to be Object[]

Gabriel Espinel · Accepted Answer · 2015-01-30 16:28:16Z

0

Option 1) You have to change the type of the array from Object to document.

document[] docary = {doc1, doc2};

Option 2) Cast the object to document.

open(((document)docary[k]).directory)

answered Jan 30, 2015 at 16:28

Gabriel Espinel

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3 Comments

a.raya203 Over a year ago

Another question, can I add and delete from an array of this nature? It seems like I cannot add or delete elements unless I use an ArrayList. If so, how can I do the same thing as above with an ArrayList?

Gabriel Espinel Over a year ago

Array's size is fixed. So you cannot modify its size nor remove or add elements. To use ArrayList instead, you can do the next: ArrayList<document> arrLst = new ArrayList<document>(); arrLst.add(doc1); arrLst.add(doc2);

Gabriel Espinel Over a year ago

and to get an element: open(arrLst.get(k).directory);

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