vb.net code to generate barcode public static <E> void reverse(Queue<E> queue) { // reverses the elements in the specified queue in Java

Printing EAN13 in Java public static <E> void reverse(Queue<E> queue) { // reverses the elements in the specified queue

public static <E> void reverse(Queue<E> queue) { // reverses the elements in the specified queue
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Write this client method using only the methods specified in the Queue interface:
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public static <E> E secondElement(Queue<E> queue) { // returns the second element in the specified queue, leaving the // queue in its original state
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public static <E> E lastElement(Queue<E> queue) { // returns the last element in the specified queue, leaving the // queue in its original state
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public static <E> void removeLastElement(Queue<E> queue) { // removes the last element in the specified queue
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public static <E> Queue<E> merge(Queue<E> q1, Queue<E> q2) { // returns a new queue that contains the same elements as the two // specified queues, alternately merged together, leaving the two // specified queues in their original state
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CHAP. 6]
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QUEUES
Add this member method to the ArrayQueue class shown in Example 6.3 on page 119:
public void reverse() // reverses the contents of this queue
6.10 Add this member method to the LinkedQueue class shown in Example 6.4 on page 120:
public void reverse() // reverses the contents of this queue
6.11 Add this member method to the ArrayQueue class shown in Example 6.3 on page 119:
public E second() { // returns the second element of this queue
6.12 Add this member method to the LinkedQueue class shown in Example 6.4 on page 120:
public E second() { // returns the second element of this queue
6.13 Add this member method to the ArrayQueue class shown in Example 6.3 on page 119:
public E removeSecond() { // removes and returns the second element of this queue
6.14 Add this member method to the LinkedQueue class shown in Example 6.4 on page 120:
public E removeSecond() { // removes and returns the second element of this queue
Answers to Review Questions
6.1 6.2 Queues are called FIFO structures because the first element that is inserted into a queue is always the first element to be removed. FIFO is an acronym for first-in-first-out. a. Yes, because a LILO structure would mean last-in-last-out which is just the same as a first-infirst-out protocol. b. No, because a FILO structure would mean first-in-last-out which is the opposite of the first-infirst-out protocol. The advantage of the linked implementation is that it essentially eliminated the possibility of queue overflow, that is, the number of calls to the add() method is limited only by the amount of computer memory available to the new operator. The only real disadvantage is that the linked implementation uses pointers, so it is more complicated than the contiguous implementation.
Solutions to Problems
6.1 6.2
A AB ABC BC C CD CDE CDEF DEF DEFG EFG FG G
public static <E> Queue<E> reversed(Queue<E> queue) { // returns a new queue that contains the same elements as the given // queue, but in reversed order Queue<E> queue1 = new ArrayDeque<E>(); Deque<E> stack = new ArrayDeque<E>(); while(!queue.isEmpty()) { stack.push(queue.remove()); } while(!stack.isEmpty()) { queue1.add(stack.pop()); } return queue1; }
QUEUES
[CHAP. 6
public static <E> Queue<E> reversed(Queue<E> queue) { // returns a new queue that contains the same elements as the given // queue, but in reversed order, and leaves the given queue in its // original state Queue<E> queue1 = new ArrayDeque<E>(); Deque<E> stack = new ArrayDeque<E>(); for (int i=0; i<queue.size(); i++) { stack.push(queue.element()); queue.add(queue.remove()); } while(!stack.isEmpty()) { queue1.add(stack.pop()); } return queue1; } public static <E> void reverse(Queue<E> queue) { // returns a new queue that contains the same elements as the given // queue, but in reversed order, and leaves the given queue in its // original state Deque<E> stack = new ArrayDeque<E>(); while(!queue.isEmpty()) { stack.push(queue.remove()); } while(!stack.isEmpty()) { queue.add(stack.pop()); } } public static <E> E secondElement(Queue<E> queue) { // returns the second element in the specified queue, leaving the // queue in its original state queue.add(queue.remove()); E element = queue.element(); for (int i=1; i<queue.size(); i++) { queue.add(queue.remove()); } return element; } public static <E> E lastElement(Queue<E> queue) { // returns the last element in the specified queue, leaving the // queue in its original state for (int i=1; i<queue.size(); i++) { queue.add(queue.remove()); } E element = queue.element(); queue.add(queue.remove()); return element; } public static <E> void removeLastElement(Queue<E> queue) { // removes the last element in the specified queue for (int i=1; i<queue.size(); i++) { queue.add(queue.remove()); } queue.remove(); } public static <E> Queue<E> merge(Queue<E> queue1, Queue<E> queue2) { // returns a new queue that contains the same elements as the two // specified queues, alternately merged together, leaving the two // specified queues in their original state
CHAP. 6]
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