shuffle

问题 I am having problem getting my code to shuffle the deck. I think i have the syntax for collections.shuffle wrong. The code I currently have is not shuffling the deck. Below please find the deck class and the card class. The deck class holds the collections.shuffle method. Deck class public class Deck { private Card[] deck = new Card[52]; private int topCard; Deck() { topCard = 0; for (int i = 0; i < deck.length; i++) deck[i] = new Card(i); } public void shuffle() { topCard = 0; Collections

问题 This question already has answers here : Python random sequence with seed (2 answers) Closed 5 years ago . I have a list of numbers and I want to shuffle it with a key and redo it. I am using it as a small encryption algorithm so I need to re-shuffle or get the original list from the suffled list. original = [10, 20, 30, 25, 45, 68, 25] shuffled = shuffle(original, key=10) print shuffled # >>> [25, 30, 25, 10, 20, 45, 68] print re_shuffle(shuffled, key=10) # >>> [10, 20, 30, 25, 45, 68, 25]

问题 I have student table , which has four fiels id, name, address and age . In this table 50 student. My question is , How to shuffle the id and get that id's details( id, name, address and age) and get the one id at a time and if i click the next button then next student details. DatabaseHeper.java // I donot understand which code write in DatabaseHeper.java file /* public Cursor shuffleJokes(int [] id) { Cursor c = null; c = myDataBase.rawQuery("select _id,title,body from jokes where title =" +

问题 With the help of this forum I've designed a program to simulate a deck of cards. The final class in the program is meant to give two options: Option 1 will display the 52 cards, and option 2 will deal out 7 random (nonrepeating) cards. I'm using Collections.shuffle for this, but I'm getting Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 52 when I select option 2 (the program works and compiles fine otherwise). Here is the class---let me know if you need any information

问题 I just started a project for my Java2 class and I've come to a complete stop. I just can't get my head around this method. Especially when the assignment does NOT let us use any other DATA STRUCTURE or shuffle methods from java at all. So I have a Deck.class in which I've already created a linked list containing 52 nodes that hold 52 cards. public class Deck { private Node theDeck; private int numCards; public Deck () { while(numCards < 52) { theDeck = new Node (new Card(numCards), theDeck);

问题 In a cogroup transformation, e.g. RDD1.cogroup(RDD2, ...), I used to assume that Spark only shuffles/moves RDD2 and retains RDD1's partitioning and in-memory storage if: RDD1 has an explicit partitioner RDD1 is cached. In my other projects most of the shuffling behaviour seems to be consistent with this assumption. So yesterday I wrote a short scala program to prove it once and for all: // sc is the SparkContext val rdd1 = sc.parallelize(1 to 10, 4).map(v => v->v) .partitionBy(new

问题 I've done shuffle in mediaplayer for a list of songs but dos not correct work please help: @Override public void onCompletion(MediaPlayer mediaPlayer) { if (isShuffle) { if (intent.hasExtra("songIndex")) { Random random = new Random(); songIndex = random.nextInt((songList.size() - 1) + 1); playSongWithIndex(songIndex); } } } and method for play song : public void playSongWithIndex(final int songIndex) { progressBar.setVisibility(View.VISIBLE); if (music_exist.exists()) { playMusicOfflineMode(

问题 I'm having a very hard time using a pseudo code for the shuffling algorithm and turning it to a working java code. I'm attempting to shuffle a linked list. Overall the method takes the pointer of the head of the linked list and returns a pointer to the head of the same list randomly. I want to use a getLength and getItem method I've created. public static ListElement shuffle(ListElement head){ head = head.getLength(); ListElement head2= null; while( head == null) { int random = (int) Math

问题 I have a list of integers ( di ), and another list ( rang_indx ) made up of numpy sub-arrays of integers (code below). For each of these sub-arrays, I need to store in a separate list ( indx ) a number of random elements, given by the di list. For what I can see np.random.shuffle() will not shuffle the elements within the sub-arrays but the sub-arrays themselves within rang_indx , which is not what I need. Hence, I need to use a for loop to first shuffle the sub-arrays (in place), and then

问题 The problem is to generate 'fifteen' puzzles in varying sizes, ensuring that all puzzles are solvable. For testing a solvable puzzle, see Wikipedia or Wolfram. Naive shuffle methods include (a) simulate a large number of random moves (b) shuffle somehow, check if valid, fix if not. See also How can I ensure that when I shuffle my puzzle I still end up with an even permutation?. An optimal shuffle will (a) produce every possible solvable puzzle with equal probability (b) perform no more than N