Java: Generic array creation error?

Question

Getting a Generic array creation error on a non generic array, I think?

So, this code works fine, pretty straight-forward.

public class test {
  private subTest[] subTests;
  private class subTest {

  }

  public test(int size) {
    subTests = new subTest[size];
  }
}

But what I am actually trying to do is something more like this:

public class test<T> {
  private subTest[] subTests;
  private T[] arrayOfGenerics; 

  private class subTest {

  }

  public test(int size, int size2) {
    arrayOfGenerics = (T[]) new Object[size];   //This line works fine
    subTests = new subTest[size2];              //This line is the one giving me a 'Generic array creation' error
  }
}

Paul Boddington · Accepted Answer · 2015-10-12 01:36:40Z

3

subTest is an inner class of test, so the type parameter of test is visible from within subTest. Therefore, you are trying to create an array of generic type

test<T>.subTest[]

You can solve this by making the class subTest a static nested class instead:

private static class subTest

If you do this, the type of the array is just

test.subTest[]

edited Oct 12, 2015 at 1:36

answered Oct 12, 2015 at 1:13

Paul Boddington

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