Example usage for java.util Random Random

Introduction

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

Prototype

public Random()

Source Link

Document

Creates a new random number generator.

Usage

From source file:com.sawyer.advadapters.app.adapters.jsonadapter.UnitTestJSONArrayActivity.java

private static boolean getBoolean() {
    return new Random().nextBoolean();
}

From source file:com.linkedin.pinot.core.data.readers.PinotSegmentUtil.java

public static List<GenericRow> createTestData(Schema schema, int numRows) {
    List<GenericRow> rows = new ArrayList<>();
    final Random random = new Random();
    Map<String, Object> fields;
    for (int i = 0; i < numRows; i++) {
        fields = new HashMap<>();
        for (FieldSpec fieldSpec : schema.getAllFieldSpecs()) {
            Object value;//from w  w w. ja v  a 2 s.  c  o m
            if (fieldSpec.isSingleValueField()) {
                value = generateSingleValue(random, fieldSpec.getDataType());
            } else {
                value = generateMultiValue(random, fieldSpec.getDataType());
            }
            fields.put(fieldSpec.getName(), value);
        }
        GenericRow row = new GenericRow();
        row.init(fields);
        rows.add(row);
    }
    return rows;
}

From source file:com.controller.RandomController.java

@RequestMapping(value = "getRandom.htm", method = RequestMethod.GET)
public @ResponseBody String getRandom() {
    Random rnd = new Random();
    String result = "<br/>Response from controller " + rnd.nextFloat() * 100 + " time " + new Date().toString();
    return result;
}

From source file:UUIDGenerator.java

protected static synchronized void getInitialUUID() {
    if (baseUUID != null) {
        return;/* www .j  a v a2  s  . c o  m*/
    }
    if (myRand == null) {
        myRand = new Random();
    }
    long rand = myRand.nextLong();
    String sid;
    try {
        sid = InetAddress.getLocalHost().toString();
    } catch (UnknownHostException e) {
        sid = Thread.currentThread().getName();
    }
    StringBuffer sb = new StringBuffer();
    sb.append(sid);
    sb.append(":");
    sb.append(Long.toString(rand));
    MessageDigest md5 = null;
    try {
        md5 = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        //todo have to be properly handled
    }
    md5.update(sb.toString().getBytes());
    byte[] array = md5.digest();
    StringBuffer sb2 = new StringBuffer();
    for (int j = 0; j < array.length; ++j) {
        int b = array[j] & 0xFF;
        sb2.append(Integer.toHexString(b));
    }
    int begin = myRand.nextInt();
    if (begin < 0)
        begin = begin * -1;
    begin = begin % 8;
    baseUUID = sb2.toString().substring(begin, begin + 18).toUpperCase();
}

From source file:com.attilax.zip.FileUtil.java

/**
 * ????/*from w ww  .  j  a  v  a 2  s.  co m*/
 * @param seed    ???
 * @return
 */
public static String getRandomFileName(String seed) {
    byte[] ra = new byte[100];
    new Random().nextBytes(ra);
    StringBuilder build = new StringBuilder("");
    for (int i = 0; i < ra.length; i++) {
        build.append(Byte.valueOf(ra[i]).toString());
    }
    String currentDate = Long.valueOf(new Date().getTime()).toString();
    seed = seed + currentDate + build.toString();
    //     return EncryptUtils.getMD5ofStr(seed).toLowerCase();
    return "";
}

From source file:com.mmj.app.common.util.SerialNumGenerator.java

/** ? */
public static String RandomString(int length) {
    String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    Random random = new Random();
    StringBuffer buf = new StringBuffer();
    for (int i = 0; i < length; i++) {
        int num = random.nextInt(62);
        buf.append(str.charAt(num));/*w  w  w  .  ja  v a 2 s  .c  o m*/
    }
    return buf.toString();
}

From source file:io.druid.query.aggregation.datasketches.tuple.GenerateTestData.java

private static void generateSketches() throws Exception {
    Path path = FileSystems.getDefault().getPath("array_of_doubles_sketch_data.tsv");
    try (BufferedWriter out = Files.newBufferedWriter(path, StandardCharsets.UTF_8)) {
        Random rand = new Random();
        int key = 0;
        for (int i = 0; i < 20; i++) {
            ArrayOfDoublesUpdatableSketch sketch = new ArrayOfDoublesUpdatableSketchBuilder()
                    .setNominalEntries(1024).build();
            sketch.update(key++, new double[] { 1 });
            sketch.update(key++, new double[] { 1 });
            out.write("2015010101");
            out.write('\t');
            out.write("product_" + (rand.nextInt(10) + 1));
            out.write('\t');
            out.write(Base64.encodeBase64String(sketch.compact().toByteArray()));
            out.newLine();//w  ww.jav a2  s.  c o m
        }
    }
}

From source file:e.pkg3.pkg6a.acertijo.acertijo.java

/**
 * Creates new form acertijo/*from w  w w . ja  v a  2  s  . c  o m*/
 */
public acertijo() {
    initComponents();
    rnd = new Random();
    numero_Aleatorio = rnd.nextInt(100) + 1;
    System.out.println("" + numero_Aleatorio);
    inicio = Calendar.getInstance();

}

From source file:com.snowplowanalytics.snowplow.tracker.core.Util.java

public static int getTransactionId() {
    Random r = new Random(); //NEED ID RANGE
    return r.nextInt(999999 - 100000 + 1) + 100000;
}

From source file:com.awcoleman.ExampleJobSummaryLogWithOutput.utility.CreateBinaryDatafile.java

public CreateBinaryDatafile(int numrecs) throws IOException {

    Random rangen = new Random();
    long recid = 0;
    try (DataOutputStream out = new DataOutputStream(new FileOutputStream("/tmp/sampleDatafile.bin"));) {

        for (int ii = 0; ii < numrecs; ii++) {
            out.writeUTF(RandomStringUtils.randomAlphabetic(10));
            out.writeLong(++recid);//from  ww w.  ja  v a 2s .co  m
            out.writeInt(rangen.nextInt(32));
            out.writeInt(rangen.nextInt(3600));
            out.writeUTF(generateDatetime());
        }
    }
}