Example usage for java.util Random nextInt

Introduction

In this page you can find the example usage for java.util Random nextInt.

Prototype

public int nextInt(int bound) 

Source Link

Document

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

Usage

From source file:com.griddynamics.jagger.reporting.LatencyPlotReportProvider.java

public static XYSeriesCollection getSeriesCollection(int seriesCount) {
    XYSeriesCollection result = new XYSeriesCollection();
    Random rnd = new Random();
    for (int i = 0; i < seriesCount; i++) {
        XYSeries series = new XYSeries(i, false, false);
        result.addSeries(series);/*from  www . j a  v  a2s  .  c  o m*/
        for (int t = 0; t < 100; t++) {
            series.add(t, rnd.nextInt(50));
        }
    }

    return result;
}

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From source file:com.linkedin.drelephant.math.Statistics.java

/**
 * Create a random sample within the original array
 *///from   w  ww  . ja va  2  s  . c o m
public static <T> void shuffleArraySample(T[] array, int sampleSize) {
    if (array.length <= sampleSize) {
        return;
    }

    T temp;
    int index;
    Random random = new Random();

    for (int i = 0; i < sampleSize; i++) {
        index = random.nextInt(array.length - i) + i;
        temp = array[index];
        array[index] = array[i];
        array[i] = temp;
    }
}

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From source file:net.duckling.ddl.web.api.rest.TeamController.java

private static String getRandomString(Integer length) {
    String str = "";
    Random random = new Random();
    for (int i = 0; i < length; i++) {
        boolean b = random.nextBoolean();
        if (b) {//from   ww  w . j  a va 2s . c  om
            str += (char) (97 + random.nextInt(26));// ???  
        } else {
            str += String.valueOf(random.nextInt(10));
        }
    }
    return str;
}

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From source file:com.wso2telco.gsma.authenticators.Utility.java

/**
 * Returns the OTP for defined length with minimum length should be 4
 * @param length for the otp/*from   w  ww  . j  ava 2  s  .co m*/
 */
public static String genarateOTP(int length) {
    if (length < 4) {
        length = 4;
    }
    String numbers = "0123456789";
    // Using random method
    Random rndm_method = new Random();
    char[] password = new char[length];
    for (int i = 0; i < length; i++) {
        // Use of charAt() method : to get character value
        // Use of nextInt() as it is scanning the value as int
        password[i] = numbers.charAt(rndm_method.nextInt(numbers.length()));
    }
    return String.valueOf(password);
}

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From source file:de.unisb.cs.st.javalanche.mutation.run.task.RandomTaskCreator.java

public static void createTaskRandomSelection(int numberOfMutations, int seed, String fileName)
        throws IOException {
    Random r = new Random(seed);
    Set<Long> coveredSet = MutationCoverageFile.getCoveredMutations();
    List<Long> covered = new ArrayList<Long>(coveredSet);
    Set<Long> selected = new HashSet<Long>();
    List<String> lines = new ArrayList<String>();
    for (int i = 0; i < numberOfMutations && covered.size() > 0; i++) {
        int index = r.nextInt(covered.size());
        Long id = covered.get(index);
        covered.remove(index);//  ww w . j av  a 2s .co  m
        selected.add(id);
        lines.add(id + "");
    }
    // List<Mutation> mutations = QueryManager.getMutationsByIds(selected
    // .toArray(new Long[0]));
    // Collections.sort(mutations);
    File file = new File(fileName);
    FileUtils.writeLines(file, lines);

}

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From source file:com.griddynamics.jagger.reporting.LatencyPlotReportProvider.java

public static List<List<Double>> getBarData() {
    Random rnd = new Random();
    List<List<Double>> range = new ArrayList<List<Double>>();
    for (int i = 0; i < 64; i++) {
        List<Double> stripe = new ArrayList<Double>();
        for (int j = 0; j < 16; j++) {
            stripe.add((double) rnd.nextInt(50) + 1);
        }//from  ww w  .j ava 2s. c o m
        range.add(stripe);
    }

    return range;
}

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From source file:it.mb.whatshare.CallGooGlInbound.java

private static String getURL(String encodedId, String deviceAssignedID) {
    StringBuilder builder = new StringBuilder("http://");
    Random generator = new Random();
    int sum = 0;/*  ww w.  ja va  2 s.  c o m*/
    for (int i = 0; i < 8; i++) {
        char rand = CHARACTERS[generator.nextInt(CHARACTERS.length)];
        builder.append(rand);
        // no idea why they set lowercase for domain names...
        sum += CHAR_MAP.get(Character.toLowerCase(rand));
    }
    builder.append("/");
    builder.append(sum);
    builder.append("?model=");
    try {
        builder.append(URLEncoder
                .encode(String.format("%s %s", Utils.capitalize(Build.MANUFACTURER), Build.MODEL), "UTF-8")
                .replaceAll("\\+", "%20"));
        builder.append("&yourid=");
        builder.append(deviceAssignedID);
        builder.append("&id=");
        builder.append(encodedId);
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
    return builder.toString();
}

---

From source file:at.illecker.hama.hybrid.examples.hellohybrid.HelloHybridBSP.java

private static void prepareInput(Configuration conf, Path inputPath, Path exampleFile, int n)
        throws IOException {
    FileSystem fs = inputPath.getFileSystem(conf);

    // Create input file writers depending on bspTaskNum
    int bspTaskNum = conf.getInt("bsp.peers.num", 1);
    SequenceFile.Writer[] inputWriters = new SequenceFile.Writer[bspTaskNum];
    for (int i = 0; i < bspTaskNum; i++) {
        Path inputFile = new Path(inputPath, "input" + i + ".seq");
        LOG.info("inputFile: " + inputFile.toString());
        inputWriters[i] = SequenceFile.createWriter(fs, conf, inputFile, IntWritable.class, NullWritable.class,
                CompressionType.NONE);//from   w w w .j a  v  a2s  .  c o m
    }

    // Create example file writer
    SequenceFile.Writer exampleWriter = SequenceFile.createWriter(fs, conf, exampleFile, IntWritable.class,
            NullWritable.class, CompressionType.NONE);

    // Write random values to input files and example
    IntWritable inputKey = new IntWritable();
    NullWritable nullValue = NullWritable.get();
    Random r = new Random();
    for (long i = 0; i < n; i++) {
        inputKey.set(r.nextInt(n));
        for (int j = 0; j < inputWriters.length; j++) {
            inputWriters[j].append(inputKey, nullValue);
        }
        inputKey.set(r.nextInt(n));
        exampleWriter.append(inputKey, nullValue);
    }

    // Close file writers
    for (int j = 0; j < inputWriters.length; j++) {
        inputWriters[j].close();
    }
    exampleWriter.close();
}

---

From source file:net.mceoin.cominghome.api.NestUtil.java

public static String tellNestAwayStatus(String access_token, String structure_id, String away_status) {
    String result = tellNestAwayStatusCall(access_token, structure_id, away_status);

    if ((result.contains("Error:")) && (!result.contains("Unauthorized"))) {
        // Try again if it was an Error but not an Unauthorized
        try {/*from   w  w  w  .  j a  va  2 s.c  om*/
            Random randomGenerator = new Random();
            int seconds = 5 + randomGenerator.nextInt(10);
            log.info("retry in " + seconds + " seconds");
            Thread.sleep(seconds * 1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        result = tellNestAwayStatusCall(access_token, structure_id, away_status);
    }

    return result;
}

---

From source file:net.mceoin.cominghome.api.NestUtil.java

public static String getNestAwayStatus(String access_token) {
    String result = getNestAwayStatusCall(access_token);

    if ((result.contains("Error:")) && (!result.contains("Unauthorized"))) {
        // Try again if it was an Error but not an Unauthorized
        try {/* w ww . jav a2 s  .c om*/
            Random randomGenerator = new Random();
            int seconds = 5 + randomGenerator.nextInt(10);
            log.info("retry in " + seconds + " seconds");
            Thread.sleep(seconds * 1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        result = getNestAwayStatusCall(access_token);
    }

    return result;
}

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