Answer Posted / marshal

public class BinaryTree
extends AbstractTree
{
protected Object key;
protected BinaryTree left;
protected BinaryTree right;

public BinaryTree (
Object key, BinaryTree left, BinaryTree right)
{
this.key = key;
this.left = left;
this.right = right;
}

public BinaryTree ()
{ this (null, null, null); }

public BinaryTree (Object key)
{ this (key, new BinaryTree (), new BinaryTree()); }
// ...
}

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