arraydeque

Sort java.util.Deque

由 浪子不回头ぞ 提交于 2021-02-16 21:06:44
问题 I want to sort the contents of my Deque<Card> collection using the Card class' getRealValue() method. public class Card implements Comparable<Card> { private final int value; private final CardType cardType; public Card(int value, CardType cardType) { this.value = value; this.cardType = cardType; } public int getRealValue() { int realValue = this.value == 1 ? 52 : 0; return realValue + this.value * 4 + this.cardType.ordinal(); } public int compareTo(Card o) { return this.getRealValue() - o

Sort java.util.Deque

由 懵懂的女人 提交于 2021-02-16 21:06:25
问题 I want to sort the contents of my Deque<Card> collection using the Card class' getRealValue() method. public class Card implements Comparable<Card> { private final int value; private final CardType cardType; public Card(int value, CardType cardType) { this.value = value; this.cardType = cardType; } public int getRealValue() { int realValue = this.value == 1 ? 52 : 0; return realValue + this.value * 4 + this.cardType.ordinal(); } public int compareTo(Card o) { return this.getRealValue() - o

Sort java.util.Deque

由 不问归期 提交于 2021-02-16 21:04:57
问题 I want to sort the contents of my Deque<Card> collection using the Card class' getRealValue() method. public class Card implements Comparable<Card> { private final int value; private final CardType cardType; public Card(int value, CardType cardType) { this.value = value; this.cardType = cardType; } public int getRealValue() { int realValue = this.value == 1 ? 52 : 0; return realValue + this.value * 4 + this.cardType.ordinal(); } public int compareTo(Card o) { return this.getRealValue() - o

addFirst method of ArrayDeque Class

由 99封情书 提交于 2019-12-21 04:50:53
问题 The code of addFirst method in java.util.ArrayDeque class is public void addFirst(E e) { if (e == null) throw new NullPointerException(); elements[head = (head - 1) & (elements.length - 1)] = e; if (head == tail) doubleCapacity(); } Here, I am not able to understand the meaning of head = (head - 1) & (elements.length - 1) Also, Suppose if array size is 10. head is at 0 and tail is at 9(Array is full). In this case, at what index system will do insertion? (My understanding is: if array is full

Why is ArrayDeque better than LinkedList

由 我与影子孤独终老i 提交于 2019-12-17 08:00:37
问题 I am trying to to understand why Java's ArrayDeque is better than Java's LinkedList as they both implement Deque interface. I hardly see someone using ArrayDeque in their code. If someone sheds more light into how ArrayDeque is implemented, it would be helpful. If I understand it, I will be more confident using it. I could not clearly understand the JDK implementation as to the way it manages head and tail references. 回答1: Linked structures are possibly the worst structure to iterate with a

About implementation of ArrayDeque in Java

由 浪尽此生 提交于 2019-12-11 11:52:10
问题 The documentation says: Resizable-array implementation of the Deque interface. Array deques have no capacity restrictions; they grow as necessary to support usage However I still want to understand what exactly the structure of ArrayDeque is, how the resizing works. Also it would be great if someone could provide a reliable source where I can find the answer. According to some of the Google results I found, it is possibly implemented as a circular array. Is it true? And what is the grow

addFirst method of ArrayDeque Class

由 你。 提交于 2019-12-03 14:23:34
The code of addFirst method in java.util.ArrayDeque class is public void addFirst(E e) { if (e == null) throw new NullPointerException(); elements[head = (head - 1) & (elements.length - 1)] = e; if (head == tail) doubleCapacity(); } Here, I am not able to understand the meaning of head = (head - 1) & (elements.length - 1) Also, Suppose if array size is 10. head is at 0 and tail is at 9(Array is full). In this case, at what index system will do insertion? (My understanding is: if array is full then, first increase its size and then do insertion in the arraySize()-1 index.) The functionality of

Differnce between addfirst and offerFirst methods in ArrayDeque

由 拜拜、爱过 提交于 2019-11-30 03:15:22
问题 Have tried out a sample program to understand the difference between addFirst and offerFirst methods in ArrayDeque of Java 6. But they seem to be same, any suggestions? public void interfaceDequetest() { try{ ArrayDeque<String> ad = new ArrayDeque<String>(); ad.addFirst("a1"); ad.offerFirst("o1"); ad.addFirst("a2"); ad.offerFirst("02"); ad.addFirst("a3"); System.out.println("in finally block"); for (String number : ad){ System.out.println("Number = " + number); } } 回答1: The difference is what

About deque<T>'s extra indirection

由 混江龙づ霸主 提交于 2019-11-29 07:21:08
Wondering why my memory accesses were somewhat slower than I expected, I finally figured out that the Visual C++ implementation of deque indeed has an extra layer of indirection built-in, destroying my memory locality. i.e. it seems to hold an array of T* , not an array of T . Is there another implementation I can use with VC++ that doesn't have this "feature", or is there some way (although I consider it unlikely) to be able to avoid it in this implementation? I'm basically looking for a vector that has also O(1) push/pop at the front. I guess I could implement it myself, but dealing with

Why typical Array List implementations aren't double-ended?

由 丶灬走出姿态 提交于 2019-11-28 13:40:12
Why aren't ArrayList s generally implemented to be double-ended, which would support fast amortized insertion in the front as well as the back? Is there ever a disadvantage to using the latter over the former? (I'm not talking just about Java -- I haven't seen double-ended array lists being the default in any other language, but Java was just a good example here.) *Edit: I originally called them "array deques" but that was a misunderstanding on my part; I wasn't talking about queues, but double-ended array lists. An ArrayList is simple; entries start at 0, and you can add stuff at the end
订阅 arraydeque