Examples of java.util.ArrayDeque.peek()

java.util.ArrayDeque.peek()
Retrieves, but does not remove, the head of the queue represented by this deque, or returns null if this deque is empty.
This method is equivalent to {@link #peekFirst}. @return the head of the queue represented by this deque, ornull if this deque is empty


    @Test
    public void peek() throws Exception {
        ArrayDeque deque = create();
        assert deque.size() == 4;
        assert deque.peek().equals("1");
        assert deque.peekFirst().equals("1");
        assert deque.peekLast().equals("4");
        assert deque.size() == 4;
    }

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