Create an ArrayList with type of an object array

Question

Like the title says, I am trying to instantiate an ArrayList with type of a class that I want to be an array. Probably I did not explain it correctly in technical terms, so let's just look at a pseudo code:

List<TestClass[5]> lTestList = new ArrayList<TestClass[5]>();

Where should I specify the size of the TestClass type array? Apologies if my explanation does not make much sense as I am still learning.

This is a completely unrelated statement, but Java has a restriction that you cannot create an array of generic objects. For example, you can't make an array of List<TestClass> like List<TestClass>[]. Of course, you can make a List of non-generic arrays, as such, List<TestClass[]>. I just figured it's interesting to know in case you didn't. — EpicPandaForce
– EpicPandaForce, Commented Oct 11, 2014 at 12:31

khelwood · Accepted Answer · 2014-10-11 12:25:53Z

2

The type of a TestClass array is TestClass[]. So you need to use that as your generic parameter.

List<TestClass[]> lTestList = new ArrayList<TestClass[]>();

Then when you add items to your list, you can add arrays of the appropriate size.

lTestList.add(new TestClass[5]);

answered Oct 11, 2014 at 12:25

khelwood

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astralmaster Over a year ago

Thank you! I feel a bit embarassed now.

WidWing · Accepted Answer · 2014-10-11 12:26:33Z

1

List<TestClass[]> lTestList = new ArrayList<TestClass[]>();

You shouldn't specify size of array in generic.

answered Oct 11, 2014 at 12:26

WidWing

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