How implementation of java.util.queue uses LIFO?

You can use any Deque as a LIFO queue using Collections.asLifoQueue method:

Queue<Integer> arrayLifoQueue = Collections.asLifoQueue(new ArrayDeque<Integer>());
Queue<Integer> linkedListLifoQueue = Collections.asLifoQueue(new LinkedList<Integer>());

You can use a java.util.LinkedList and use the pop() and push() methods and use it like a stack, which is a LIFO queue.