Some collection [closed]

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I'm needing to store a link structure. As a hierarchy, for example, x link, links children of x, y link, links children of y. Resorting to the use of java object id. I wonder if you have something like this in Java, any collection that does it for me.

Thanks!

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AFAIK, there's no standard java Collections class for this.

However, it's not a tough class to write. Something like this would do:

class Node {
    List<Node> children = new ArrayList();

    public List<Node> getChildren() {
        return children;
    }
}