Class Cast Exception in Java: cannot be cast?

You can't make a Typed array. You have to do this: Node children = new Nodedegree * 2 And deal with the fact that arrays are untyped :(.

You can't make a Typed array. You have to do this: Node children = new Nodedegree * 2; And deal with the fact that arrays are untyped :(.

This gives a compiler warning though. – aioobe Feb 16 at 19:43 2 It does give a warning. And it should give a warning because it's something to be concerned about.

But there is an important difference between a warning and an error. Warnings say "The compiler noticed something that could become a problem" where as errors say "The compiler noticed something that is a problem". – glowcoder Feb 16 at 20:17 I have selected this as my answer because what I am trying to implement cannot have list as it has to be of fixed size from the start.... Thanks.. – user506710 Feb 17 at 16:14.

You cannot do this: Node children = (Node)new Objectdegree * 2; Here you are creating an Object array and an Object is not a Node. You should be creating a Node array instead, i.e. Node children = new Nodedegree * 2; You have this same error twice in your code.

Instead of arrays for your children and keys, use List> and List (and ArrayList as the implementation). This way you hide away the complexity of the array creation and casting inside the ArrayList class. (It uses an Object, too, but only converts on get() and similar methods instead of trying to have a generic array).

Or, since it looks you are creating kind of a map anyways, use a Map for your keys and nodes (you have no index-access then, though).

You can't cast an Object to a Node: Node children = (Node)new Objectdegree * 2; Either you're thinking of it the wrong way: "Any Object could be a Node" when the only thing that is true is "Every Node is an Object", or, you're used to C++ or similar in which you may cast a void pointer to any other pointer. Furthermore, you can't have arrays of generic types. You'll have to for instance create a wrapper type, say.

StringNode extends Node in order to store them in an array. This snippet, for instance, compiles just fine: class Node { } class StringNode extends Node { } public class Test { public void method() { Node children = new StringNode5; } }.

You cannot create new Node - compile error "generic array creation". – glowcoder Feb 16 at 19:37 Right. Just realized that, and updated.

– aioobe Feb 16 at 19:38 You can write a (Node)new Node (with an unchecked cast). – PaÅ­lo Ebermann Feb 16 at 19:46.

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