CODEWITHSUNDEEP
javaarraysarraylist
Cody
Cody

Reputation: 8944

using toArray with ArrayList of custom objects

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

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

Upvotes: 2

Views: 7469

Answers (3)

vinaynag
vinaynag

Reputation: 271

CustomObj[] customArray = new CustomObj[size];

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

Upvotes: 0

Puce
Puce

Reputation: 38132

Use:

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

Upvotes: 1

Mark Elliot
Mark Elliot

Reputation: 77034

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()]);

Upvotes: 18

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