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Andrew Hartman

Joined: Mar 18, 2004
Posts: 16
Where can I find information about arrays?
How do i create an array to store numbers? And can I change the size of the array using a variable such as arraySize?
Any help will be much appreciated
Jeff Langr
Ranch Hand

Joined: May 14, 2003
Posts: 762
This code shows three ways to create an array of integers.

Any book on Java will explain arrays. Try Thinking in Java by Bruce Eckel, available free at
You cannot change the size of an array. If you need to add elements to a "full" array, you must allocate a new array, then copy all elements from the old array to the new. The method System.arraycopy does this most efficiently.
Instead of using an array, prefer use of a collection class (such as ArrayList, which implements the interface List), which handles all this for you.

Books: Agile Java, Modern C++ Programming with TDD, Essential Java Style, Agile in a Flash. Contributor, Clean Code.
subject: Arrays