Example usage for java.lang Math random

Introduction

In this page you can find the example usage for java.lang Math random.

Prototype

public static double random() 

Source Link

Document

Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0 .

Usage

From source file:Main.java

public MyModel(int size) {
    arraySize = size;//  w w w . j av a 2  s  .  c om
    myArray = new int[arraySize];
    for (int i = 0; i < arraySize; i++) {
        myArray[i] = (int) (Math.random() * 99) + 1;
    }
}

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From source file:com.callidusrobotics.droptables.view.ResultListViewTest.java

@Before
public void before() throws Exception {
    results = new ArrayList<ResultEntry>();
    for (int i = 0; i < 10; i++) {
        ResultEntry result = ModelUtil.buildResult();
        Map<String, String> params = new HashMap<String, String>();
        params.put("foo", "" + (int) (Math.random() * 1000));
        result.setParameters(params);//from w  w w.  java  2s  .co  m
        results.add(result);
    }
    results.get(0).setReport(null);
    ModelUtil.clearTTL(results.get(1));

    view = new ResultListView(results);
    renderer = new FreemarkerViewRenderer();
    writer = new ByteArrayOutputStream();
}

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From source file:com.ciphertool.genetics.algorithms.mutation.cipherkey.RandomValueMutationAlgorithm.java

@Override
public void mutateChromosome(KeyedChromosome<Object> chromosome) {
    if (maxMutationsPerChromosome == null) {
        throw new IllegalStateException("The maxMutationsPerChromosome cannot be null.");
    }/*from w w w  . ja v a  2s  . c  o m*/

    /*
     * Choose a random number of mutations constrained by the configurable
     * max and the total number of genes
     */
    int numMutations = (int) (Math.random() * Math.min(maxMutationsPerChromosome, chromosome.getGenes().size()))
            + 1;

    Set<Object> availableKeys = chromosome.getGenes().keySet();

    for (int i = 0; i < numMutations; i++) {
        // Keep track of the mutated keys
        mutateRandomGene(chromosome, availableKeys);
    }
}

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From source file:gov.nih.nci.cabig.ctms.tools.configuration.DatabaseBackedConfigurationTest.java

@Override
protected void setUp() throws Exception {
    super.setUp();
    sessionFactory = new AnnotationConfiguration().addAnnotatedClass(DefaultConfigurationEntry.class)
            .addAnnotatedClass(AlternateConfigurationEntry.class)
            .setProperty("hibernate.connection.driver_class", "org.hsqldb.jdbcDriver")
            .setProperty("hibernate.connection.url", "jdbc:hsqldb:mem:test" + Math.random())
            .setProperty("hibernate.connection.username", "sa").setProperty("hibernate.connection.password", "")
            .buildSessionFactory();//from   ww  w  .  j a va2 s  .  co m
    stubListener = new StubConfigurationListener();
    configuration = new ExampleConfiguration();
    configuration.setSessionFactory(sessionFactory);
    configuration.addConfigurationListener(stubListener);
    altConfiguration = new AlternateConfiguration();
    altConfiguration.setSessionFactory(sessionFactory);
    SingleConnectionDataSource ds = new SingleConnectionDataSource(sessionFactory.openSession().connection(),
            false);
    ds.setAutoCommit(true);
    jdbc = new JdbcTemplate(ds);

    for (String table : new String[] { DEFAULT_TABLE, ALT_TABLE }) {
        jdbc.execute(String.format(
                "CREATE TABLE %s (key VARCHAR(255) PRIMARY KEY, value VARCHAR(255), version INTEGER DEFAULT '0' NOT NULL)",
                table));
    }
}

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From source file:com.ciphertool.genetics.algorithms.mutation.ConservativeMutationAlgorithm.java

@Override
public void mutateChromosome(Chromosome chromosome) {
    if (maxMutationsPerChromosome == null) {
        throw new IllegalStateException("The maxMutationsPerChromosome cannot be null.");
    }// ww w  .ja v a 2s  . c  o  m

    /*
     * Choose a random number of mutations constrained by the configurable
     * max and the total number of genes
     */
    int numMutations = (int) (Math.random() * Math.min(maxMutationsPerChromosome, chromosome.getGenes().size()))
            + 1;

    List<Integer> geneIndices = new ArrayList<Integer>();
    for (int i = 0; i < numMutations; i++) {
        // Keep track of the mutated indices
        geneIndices.add(mutateRandomGene(chromosome, geneIndices));
    }
}

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From source file:tech.beshu.ror.integration.FiltersAndFieldsSecurityTests.java

private static void insertDoc(String docName, RestClient restClient, String idx, String field) {
    if (adminClient == null) {
        adminClient = restClient;//ww w  .  j a v a 2s  .co  m
    }

    String path = "/" + IDX_PREFIX + idx + "/documents/doc-" + docName + String.valueOf(Math.random());
    try {

        HttpPut request = new HttpPut(restClient.from(path));
        request.setHeader("Content-Type", "application/json");
        request.setHeader("refresh", "true");
        request.setHeader("timeout", "50s");
        request.setEntity(new StringEntity("{\"" + field + "\": \"" + docName + "\", \"dummy\": true}"));
        System.out.println(body(restClient.execute(request)));

    } catch (Exception e) {
        e.printStackTrace();
        throw new IllegalStateException("Test problem", e);
    }

    // Polling phase.. #TODO is there a better way?
    try {
        HttpResponse response;
        do {
            HttpHead request = new HttpHead(restClient.from(path));
            request.setHeader("x-api-key", "p");
            response = restClient.execute(request);
            System.out.println(
                    "polling for " + docName + ".. result: " + response.getStatusLine().getReasonPhrase());
            Thread.sleep(200);
        } while (response.getStatusLine().getStatusCode() != 200);
    } catch (Exception e) {
        e.printStackTrace();
        throw new IllegalStateException("Cannot configure test case", e);
    }
}

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From source file:gov.nih.nci.caintegrator.application.zip.FileNameGenerator.java

public static String generateUniqueFileName(String fileName, String type, String platform) {
    String uniqueZipFileName = null;
    String platformID = null;//from  w  ww  . jav a  2 s.co  m

    if (fileName != null && type != null && platform != null) {
        if (platform.equals(Constants.AFFY_OLIGO_PLATFORM)) {
            platformID = "AFFY-U133P2";
        } else if (platform.equals(Constants.AFFY_100K_SNP_ARRAY)) {
            platformID = "AFFY-100K-SNP";
        }
        uniqueZipFileName = createFilename(fileName);
        // Get a random number of up to 7 digits      
        int sevenDigitRandom = new Double(Math.random() * 10000000).intValue();

        // Get the last 7 digits of the Java timestamp
        String s = String.valueOf(System.currentTimeMillis());
        String lastSevenOfTimeStamp = s.substring(s.length() - 7, s.length());

        // Put it all together
        uniqueZipFileName = fileName + "_" + platformID + "_" + type + "_" + sevenDigitRandom
                + lastSevenOfTimeStamp;
    }
    return uniqueZipFileName;
}

---

From source file:com.almende.test.dht.TestScale.java

/**
 * Test a large nof nodes./*from  w w  w  . ja v  a2 s  .com*/
 * 
 * @throws IOException
 *             Signals that an I/O exception has occurred.
 * @throws URISyntaxException
 *             the URI syntax exception
 * @throws InterruptedException
 *             the interrupted exception
 */
@Test
public void testScale() throws IOException, URISyntaxException, InterruptedException {
    DHTAgent[] agents = new DHTAgent[NOFNODES];

    DHTAgent agent = new DHTAgent("agent_0");
    agents[0] = agent;
    for (int i = 1; i < NOFNODES; i++) {
        System.out.print("Created node:agent_" + i + "\r");
        DHTAgent next = new DHTAgent("agent_" + i);
        try {
            next.getDht().join(agent.asNode());
        } catch (NullPointerException e) {
            System.err.println("NPE at:" + i);
            throw e;
        }
        agent = next;
        agents[i] = agent;
    }
    final Key key = Key.fromString("Hello world");
    final ObjectNode value = JOM.createObjectNode();
    value.put("Hello:", "world!");
    agents[0].getDht().iterative_store_value(key, value);

    JsonNode result = agents[(int) Math.floor(Math.random() * NOFNODES)].getDht()
            .iterative_find_value(Key.fromString("Hello world"), false);

    assertEquals(result, value);

    final int otherIdx = (int) Math.floor(Math.random() * NOFNODES);
    JsonNode result2 = agents[otherIdx].getDht().iterative_find_value(Key.fromString("Hello world"), false);
    assertEquals(result2, value);

    final Key key2 = Key.fromString("Some other key");
    final ObjectNode value2 = JOM.createObjectNode();
    value2.put("Hello:", "world2!");
    agents[0].getDht().iterative_store_value(key2, value2);

    JsonNode result3 = agents[(int) Math.floor(Math.random() * NOFNODES)].getDht()
            .iterative_find_value(Key.fromString("Some other key"), false);

    assertEquals(result3, value2);

    JsonNode result4 = agents[otherIdx].getDht().iterative_find_value(Key.fromString("Hello world"), false);
    assertNotSame(result4, value2);
    assertEquals(result4, value);

    JsonNode result5 = agents[otherIdx].getDht().iterative_find_value(Key.fromString("Hello world"), false);
    assertEquals(result5, value);
    JsonNode result6 = agents[otherIdx].getDht().iterative_find_value(Key.fromString("Hello world!"), false);
    assertNotSame(result6, value);
    assertEquals(result6, JOM.createNullNode());

    final BitSet set = key2.getVal();
    set.set(10, !set.get(10));
    final Key key3 = new Key(set);
    final ObjectNode value3 = JOM.createObjectNode();
    value3.put("Hello:", "world3!");
    agents[0].getDht().iterative_store_value(key3, value3);

    JsonNode result7 = agents[otherIdx + 2].getDht().iterative_find_value(key3, false);
    assertEquals(result7, value3);

    int count = 0;
    for (final DHTAgent a : agents) {
        if (a.getDht().hasValues()) {
            count++;
        }
    }
    System.out.println(count + " agents have some value stored.");
}

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From source file:net.audumla.climate.bom.BOMClimateObserverCatalogue.java

protected static String generationCoordinateURL(ClimateDataSource llsource, String key) {
    // http://www.bom.gov.au/jsp/ncc/cdio/weatherData/av?p_stn_num=86071&p_display_type=nearest10_tab2&p_nccObsCode=139&p_match=50,,37.70,145.0972,,LATLON,201&sid=0.7166697874199599
    // 3079_86068 Watsonia VIC (4.5km away)
    String p_stn_num = "p_stn_num=86071&";
    String p_display_type = "p_display_type=nearest10_tab2&";
    String p_nccObsCode = "p_nccObsCode=139&";
    String p_match = "p_match=50,," + (-1 * llsource.getLatitude()) + "," + llsource.getLongitude()
            + ",,LATLON," + key;
    String sid = String.valueOf(Math.random());
    String url = BOMLatLongLookup + p_stn_num + p_display_type + p_nccObsCode + p_match + sid;
    return url;/* w  ww  .  j a v  a2 s  .c o  m*/

}

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From source file:com.msopentech.odatajclient.proxy.api.context.EntityUUID.java

public EntityUUID(final String schemaName, final String containerName, final String entitySetName,
        final String name, final Object key) {
    this.schemaName = schemaName;
    this.containerName = containerName;
    this.entitySetName = entitySetName;
    this.name = name;
    this.key = key;
    this.tempKey = (int) (Math.random() * 1000000);
}

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