Generic array in java issue

Question

I have this bit of code and it keeps saying that it cannot create a generic array, but, I don't have a generic in my Node class, just an Object field. The Node class is an inner class. Why is it doing this?

public class TernarySearchTrie<E> implements TrieInterface<E> {

    private Node[] root = new Node[256];
    private int size = 0;

    private class Node {
        char c;
        Node left, mid, right;
        Object value;
    }
}

private TernarySearchTrie.Node[] root = new TernarySearchTrie.Node[256]; works — erkfel
– erkfel, Commented May 23, 2016 at 0:46

Emerson Dallagnol · Accepted Answer · 2016-05-23 01:00:40Z

4

Add the static modifier to Node class:

private static class Node {
    char c;
    Node left, mid, right;
    Object value;
}

Without static, it depends of the TernarySearchTrie class, that have generics.

answered May 23, 2016 at 1:00

Emerson Dallagnol

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Comments

Hessam · Accepted Answer · 2016-05-23 00:58:24Z

2

What you do in the problematic new Node[256] is actually TernarySeachTrie<E>.Node[256]. One solution is to use raw type:

Node[] root = TernarySearchTrie.Node[256];

Of course the compiler gives you a warning for this.

answered May 23, 2016 at 0:58

Hessam

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