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Basically, A linked list that has its tail linked to its head, usually the tail is kept track of since it provides constant access to both the end and the front of the linked list.

ListNode x = new ListNode( value, null); //a ListNode with no next

x.setNext( new ListNode( value, null)); // make its next another ListNode with no next

x.getNext().setNext(x); // set the new node's next to my old node, now you have a circular linked list.

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