ArrayNode.java

import java.util.ArrayList;
import java.util.List;

public class ArrayNode extends Node
{
    private List<Node> elements;

    public ArrayNode(List<Node> elements)
    {
        this.elements = elements;
    }

    public Object eval()
    {
        List<Object> items = new ArrayList<Object>(elements.size());
        for (Node node : elements)
        {
            items.add(node.eval());
        }
        return items;
    }
}