Example usage for java.util Collections shuffle

Introduction

In this page you can find the example usage for java.util Collections shuffle.

Prototype

public static void shuffle(List<?> list) 

Source Link

Document

Randomly permutes the specified list using a default source of randomness.

Usage

From source file:de.jackwhite20.japs.shared.nio.NioSocketClient.java

public NioSocketClient(List<ClusterServer> clusterServers, String name) {

    // Randomize the list to give a chance for a better use of the cluster
    Collections.shuffle(clusterServers);

    if (name == null || name.isEmpty()) {
        throw new IllegalArgumentException("name cannot be null or empty");
    }// ww  w .j  ava2s .co m

    this.clusterServers = clusterServers;
    this.name = name;

    ClusterServer first = clusterServers.get(0);

    this.host = first.host();
    this.port = first.port();

    if (!connect(host, port)) {
        throw new ConnectException("cannot initially connect to " + first.host() + ":" + first.port());
    }
}

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From source file:com.github.fge.uritemplate.ExtendedTestsTest.java

@DataProvider
public Iterator<Object[]> getData() {
    final List<Object[]> list = Lists.newArrayList();

    VariableMapBuilder builder;/*  w w  w .  j  a  va 2s.  c o m*/
    Iterator<Map.Entry<String, JsonNode>> iterator;
    Map.Entry<String, JsonNode> entry;

    for (final JsonNode node : data) { // Cycle through values
        if (node.path("disabled").asBoolean(false))
            continue;
        builder = VariableMap.newBuilder();
        iterator = node.get("variables").fields();
        while (iterator.hasNext()) {
            entry = iterator.next();
            if (entry.getValue().isNull())
                continue;
            builder.addValue(entry.getKey(), Util.fromJson(entry.getValue()));
        }
        for (final JsonNode n : node.get("testcases"))
            list.add(new Object[] { n.get(0).textValue(), builder.freeze(), n.get(1) });
    }

    Collections.shuffle(list);

    return list.iterator();
}

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From source file:com.tealcube.minecraft.bukkit.mythicdrops.tiers.TierMap.java

/**
 * Gets a random {@link Tier} out of the ones loaded on the server using chance. Returns null if none found.
 *
 * @return random Tier/*from www  .  j av  a 2  s .co  m*/
 */
public Tier getRandomWithChance() {
    double totalWeight = 0;
    List<Tier> v = new ArrayList<>(values());
    Collections.shuffle(v);
    for (Tier t : v) {
        totalWeight += t.getSpawnChance();
    }

    double chosenWeight = MythicDropsPlugin.getInstance().getRandom().nextDouble() * totalWeight;

    double currentWeight = 0;

    for (Tier t : v) {
        currentWeight += t.getSpawnChance();

        if (currentWeight >= chosenWeight) {
            return t;
        }
    }

    return null;
}

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From source file:com.pzy.jcook.project.web.FrontController.java

@RequestMapping("exam")
public String exam(Model model, HttpServletRequest req) {
    User user = (User) req.getSession().getAttribute("webuser");
    if (user == null) {
        model.addAttribute("tip", "?");
        return "web/car";
    }/*from ww  w. j  ava  2s  . co  m*/
    List<Exam> exams = examService.findAll();
    Collections.shuffle(exams);
    model.addAttribute("exams", exams);
    return "web/exam";
}

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From source file:cz.fi.muni.pa165.service.GameServiceImpl.java

@Override
public List<List<Pair>> generateSeasonMatches() {
    List<List<Pair>> result = new ArrayList<>();

    List<Team> teams = teamDao.findByAll();
    Collections.shuffle(teams);

    //add ghost team if odd number of teams
    if (teams.size() % 2 != 0)
        teams.add(new Team(-1L));

    //round robin
    for (int i = 0; i < teams.size() - 1; i++) {
        List<Pair> row = new ArrayList<>();
        for (int j = 0; j < teams.size() / 2; j++) {
            if (teams.get(j).getId() != -1L && teams.get(teams.size() - j - 1).getId() != -1L)
                row.add(new Pair(teams.get(j), teams.get(teams.size() - j - 1)));
        }//w w  w .j  av  a2 s.  c om
        result.add(row);

        Team t = teams.remove(teams.size() - 1);
        teams.add(1, t);
    }

    Collections.shuffle(result);
    return result;
}

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From source file:org.flite.cach3.test.l2.L2InvalidateMultiTest.java

@Test
public void test() {
    final TestSvc test = (TestSvc) context.getBean("testSvc");

    final String g1 = RandomStringUtils.randomAlphabetic(4) + "-";

    final List<Long> ids = new ArrayList<Long>();
    final long base = System.currentTimeMillis() - 200000;
    for (int ix = 0; ix < 10; ix++) {
        ids.add(base + ix);//from w ww. j a va  2 s . c o m
    }

    final List<Long> addls = new ArrayList<Long>();
    addls.addAll(ids);
    for (int ix = 0; ix < 10; ix++) {
        addls.add(1000L + ix);
    }
    Collections.shuffle(addls);

    // Set the base expectations
    final List<String> first = test.getL2MultiAlpha(addls, g1);
    for (final String out : first) {
        assertTrue(out.startsWith(g1));
    }

    // Now call the invalidate
    test.invalidateL2MultiCharlie(ids);

    // Only the invalidated ones should be different.
    Collections.shuffle(addls);
    final String g2 = RandomStringUtils.randomAlphabetic(8) + "-";
    final List<String> results = test.getL2MultiAlpha(addls, g2);
    assertTrue(results.size() > 0);
    for (int ix = 0; ix < addls.size(); ix++) {
        final Long key = addls.get(ix);
        final String result = results.get(ix);
        assertTrue(StringUtils.contains(result, key.toString()));
        assertTrue("Key: " + key, result.startsWith(ids.contains(key) ? g2 : g1));
    }
}

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From source file:com.mythesis.profileanalysis.Evaluate.java

public Evaluate(String outputDirectory, List<Integer> nTopics, List<Double> beta, int niters, int top_words,
        String LDAdir, double testSplit) {
    this.outputDirectory = outputDirectory;
    this.nTopics = new ArrayList<>();
    this.alpha = new ArrayList<>();
    this.beta = new ArrayList<>();
    this.nTopics = nTopics;
    for (Integer nTopic : nTopics) {
        this.alpha.add((double) (50 / nTopic));
    }//from  ww  w . j a  va 2s .c om
    this.beta = beta;
    this.niters = niters;
    this.top_words = top_words;
    logLikelihoods = new ArrayList<>();
    trainingSet = new ArrayList<>();
    testSet = new ArrayList<>();

    File ldaFile = new File(LDAdir);
    List<String> pages = new ArrayList<>();
    try {
        pages = FileUtils.readLines(ldaFile);
    } catch (IOException ex) {
        Logger.getLogger(Evaluate.class.getName()).log(Level.SEVERE, null, ex);
    }

    pages.remove(0);
    //shuffle pages 
    Collections.shuffle(pages);
    int testSetSize = (int) (pages.size() * testSplit);
    int trainingSetSize = pages.size() - testSetSize;
    int counter = 0;
    Random rn = new Random();
    testSet.add(String.valueOf(testSetSize));
    trainingSet.add(String.valueOf(trainingSetSize));

    while (counter < testSetSize) {
        int index = rn.nextInt(pages.size());
        if (!testSet.contains(pages.get(index))) {
            testSet.add(pages.get(index));
            pages.remove(index);
            counter++;
        }
    }

    trainingSet.addAll(pages);
}

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From source file:com.weavers.duqhan.controller.WebController.java

@RequestMapping(value = "/scraping", method = RequestMethod.GET) // scraping product from list
@ResponseBody//from   w  w  w . j ava 2 s.  co m
public String scraping(@RequestParam int start, @RequestParam int limit) {
    List<StatusBean> statusBeans = new ArrayList<>();
    for (int i = start; i < start + limit; i++) {
        StatusBean bean = new StatusBean();
        bean.setId(Long.valueOf(i));
        statusBeans.add(bean);
    }
    Collections.shuffle(statusBeans);
    productService.loadTempProducts(statusBeans);
    return "wait'n watch..";
}

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From source file:com.tealcube.minecraft.bukkit.mythicdrops.utils.TierUtil.java

public static Tier randomTierWithIdentifyChance(Collection<Tier> values) {
    Validate.notNull(values, "Collection<Tier> cannot be null");
    double totalWeight = 0;
    List<Tier> v = new ArrayList<>(values);
    Collections.shuffle(v);
    for (Tier t : v) {
        totalWeight += t.getIdentifyChance();
    }//w w  w  .  ja v  a  2  s .  c  om

    double chosenWeight = MythicDropsPlugin.getInstance().getRandom().nextDouble() * totalWeight;

    double currentWeight = 0;

    for (Tier t : v) {
        currentWeight += t.getIdentifyChance();

        if (currentWeight >= chosenWeight) {
            return t;
        }
    }

    return null;
}

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From source file:com.naver.jr.study.bo.sesame.SesameBOImpl.java

private List<SesameContents> getMainStepList(List<SesameContents> contentList, String stepName) {
    List<SesameContents> sesameContentList = sesameDAO.selectMainStepList(stepName);
    Collections.shuffle(sesameContentList);

    if (CollectionUtils.isNotEmpty(sesameContentList)) {
        contentList.add(sesameContentList.get(0));
    }/*  w ww. java  2s  .  c  o m*/

    return contentList;
}

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