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org.zkoss.zksandbox.tree.BinaryTreeModel

public class BinaryTreeModel extends AbstractTreeModel{

private ArrayList _tree =null;

public BinaryTreeModel(List tree){
        super(tree.get(0));
        _tree = (ArrayList)tree;
    }

public Object getChild(Object parent, int index) {
        int i = _tree.indexOf(parent) *2 +1 + index;
        if( i>= _tree.size())
            return null;
        else
            return _tree.get(i);
    }

public int getChildCount(Object parent) {
        int count = 0;
        if(getChild(parent,0) != null)
            count++;
        if(getChild(parent,1) != null)
            count++;
        return count;
    }

public boolean isLeaf(Object node) {
        return (getChildCount(node) == 0);
    }

}

org.zkoss.zksandbox.BigList

public class BigList extends java.util.AbstractList {
private int _sz;
public BigList(int sz) {
if (sz < 0)
throw new IllegalArgumentException(
"Negative not allowed: "+sz);
_sz = sz;
}
public int size() {
return _sz;
}
public Object get(int j) {
return new Integer(j);
}
}
------------------------------

<zk>
<zscript>
import org.zkoss.zksandbox.tree.BinaryTreeModel;

BinaryTreeModel btm = new BinaryTreeModel(new ArrayList(new org.zkoss.zksandbox.BigList(50)));
    </zscript>
    <tree id="tree" model="${btm}" vflex="1"/>
</zk>

https://www.zkoss.org/zksandbox/#g12