using toArray with ArrayList of custom objects

Question

Is there a way to use the toArray() method on an ArrayList<CustomObject>?

From what I see, it can only be used with Object

There is ArrayList<T>.toArray()...

Oliver Charlesworth
– Oliver Charlesworth

2011-11-16 00:58:01 +00:00
Commented Nov 16, 2011 at 0:58 — Oliver Charlesworth
– Oliver Charlesworth, Commented Nov 16, 2011 at 0:58

Mark Elliot · Accepted Answer · 2011-11-16 00:59:14Z

18

You need to pass in an array of CustomObject in order to get one back. The parameter-free ArrayList.toArray() call returns an Object[], but the parameterized version T[] ArrayList<T>.toArray(T[]) returns what you expect. If you size the array you pass as a parameter correctly then the call will use the array you pass rather than allocate another one, e.g.

ArrayList<CustomObject> foo;
//...
CustomObject[] bar = foo.toArray(new CustomObject[foo.size()]);

answered Nov 16, 2011 at 0:59

Mark Elliot

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Puce · Accepted Answer · 2011-11-16 01:01:03Z

1

Use:

CustomObject[] customObjects = myList.toArray(new CustomObject[myList.size()])

answered Nov 16, 2011 at 1:01

Puce

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vinaynag · Accepted Answer · 2011-11-16 01:05:59Z

0

CustomObj[] customArray = new CustomObj[size];

customArray = (CustomObj[])ArrayListObj.toArray(customArray);

answered Nov 16, 2011 at 1:05

vinaynag

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