CODEWITHSUNDEEP
java
user258875
user258875

Reputation:

Java Tree Error

I am trying to implement an array based tree where each node has a list of child nodes and I am getting an error that I need help fixing.

Error: 

Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Lassign2Trees.ArrayTreeNode;
 at assign2Trees.ArrayTree.<init>(ArrayTree.java:15)
 at assign2Trees.ArrayTree.main(ArrayTree.java:97

)

The error comes from here I believe:

ArrayTreeNode<E>[] tree = (ArrayTreeNode<E>[]) new Object[1];

Upvotes: 2

Views: 387

Answers (1)

matt b
matt b

Reputation: 139961

ClassCastException: [Ljava.lang.Object; cannot be cast to [Lassign2Trees.ArrayTreeNode;
 at assign2Trees.ArrayTree.<init>(ArrayTree.java:15)

refers to this line:

 ArrayTreeNode<E>[] tree = (ArrayTreeNode<E>[]) new Object[1];

You cannot cast an Object[] to any other type.

Even if this worked, you have another error immediately after this: arrays in Java are indexed starting at 0, not 1. To access the first element in an array, you would refer to tree[0].

Upvotes: 3

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