Databases
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    <pre><code>class ListNode { public ListNode next; public Object data; public ListNode(Object data, ListNode next) { this.next = next; this.data = data; } } class CircularLinkedList { private ListNode head = null; private int numberOfElements = 0; private ListNode actualElement = null; private int index = 0; public boolean isEmpty() { return (numberOfElements == 0); } public int getNumberOfElements() { return numberOfElements; } public void insertFirst(Object data) { if (!(isEmpty())) { index++; } ListNode listNode = new ListNode(data, head); head = listNode; numberOfElements++; } public void insertAfterActual(Object data) { ListNode listNode = new ListNode(data, actualElement.next); actualElement.next = listNode; numberOfElements++; } public boolean deleteFirst() { if (isEmpty()) return false; if (index &gt; 0) index--; head = head.next; numberOfElements--; return true; } public boolean deleteActualElement() { if (index &gt; 0) { numberOfElements--; index--; ListNode listNode = head; while (listNode.next.equals(actualElement) == false) listNode = listNode.next; listNode.next = actualElement.next; actualElement = listNode; return true; } else { actualElement = head.next; index = 0; return deleteFirst(); } } public boolean goToNextElement() { if (isEmpty()) return false; index = (index + 1) % numberOfElements; if (index == 0) actualElement = head; else actualElement = actualElement.next; return true; } public Object getActualElementData() { return actualElement.data; } public void setActualElementData(Object data) { actualElement.data = data; } } </code></pre>
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    1. COThere were two minor bugs in the deleteActualElement method, I've corrected them.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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