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:Main.java

/**
 * get a fixed-length random string, its a mixture of chars in sourceChar
 *
 * @param sourceChar//w  w w  .  j a v  a  2s  . c om
 * @param length
 * @return <ul>
 * <li>if sourceChar is null or empty, return null</li>
 * <li>if length less than 0, return null</li>
 * </ul>
 */
public static String getRandom(char[] sourceChar, int length) {
    if (sourceChar == null || sourceChar.length == 0 || length < 0) {
        return null;
    }

    StringBuilder str = new StringBuilder(length);
    Random random = new Random();
    for (int i = 0; i < length; i++) {
        str.append(sourceChar[random.nextInt(sourceChar.length)]);
    }
    return str.toString();
}

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From source file:io.cortical.rest.model.TestDataMother.java

/**
 * Create dummy  {@link Fingerprint}.//from  w ww.  j  ava 2 s. c o  m
 * 
 * @return dummy fingerprint.
 */
public static Fingerprint createFingerprint() {
    Random random = new Random();
    Set<Integer> positionSet = new HashSet<>();
    while (positionSet.size() <= FINGERPRINT_LENGTH) {
        positionSet.add(random.nextInt(MAX_POSITION));
    }

    Integer[] positionsInteger = new Integer[FINGERPRINT_LENGTH];
    positionsInteger = positionSet.toArray(positionsInteger);
    sort(positionsInteger);
    return new Fingerprint(ArrayUtils.toPrimitive(positionsInteger));
}

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From source file:boutique.service.GenerationCodePromoService.java

public void GenerationCodePromo(CodePromo codePromo) {

    Random rand = new Random();
    Integer nombreAleatoire = rand.nextInt(999999 - 100000 + 1) + 100000;
    codePromo.setCode(nombreAleatoire.toString());
    codePromoService.save(codePromo);/*from  w  w w  . j  ava  2  s .  com*/
}

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From source file:Main.java

public static <T> T generateRandom(Class<T> objectClass) {
    Random r = new Random();
    if (objectClass.equals(String.class)) {
        String s = "";
        for (int i = 0; i < 10; i++) {
            char c = (char) (Math.abs(r.nextInt()) % ('Z' - 'A') + 'A');
            s = s + c;/*from   w  w  w.jav a 2s  .  c o  m*/
        }
        return objectClass.cast(s);
    } else if (objectClass.equals(Integer.class)) {
        Integer s = r.nextInt();
        return objectClass.cast(s);
    } else if (objectClass.equals(Long.class)) {
        Long s = r.nextLong();
        return objectClass.cast(s);
    } else if (objectClass.equals(java.util.Date.class)) {
        java.util.Calendar c = java.util.Calendar.getInstance();
        c.set(java.util.Calendar.MONTH, Math.abs(r.nextInt()) % 12);
        c.set(java.util.Calendar.DAY_OF_MONTH, Math.abs(r.nextInt()) % 30);
        return objectClass.cast(c.getTime());
    }
    return null;
}

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From source file:Main.java

int getRandom() {
    return this.range.get(new Random().nextInt(this.range.size()));
}

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From source file:mb.impostor.bytearray.RandByteArray.java

public byte[] randDataGen(String type, int count) {
    byte[] randbuf;
    if (type.compareToIgnoreCase("NRandom") == 0) {
        randbuf = RandomUtils.nextBytes(new Random().nextInt(count));
        return randbuf;
    } else if (type.compareToIgnoreCase("Random") == 0) {
        randbuf = RandomUtils.nextBytes(count);

        return randbuf;
    } else if (type.compareToIgnoreCase("RandString") == 0) {
        String s = RandomStringUtils.randomAlphanumeric(count);

        return s.getBytes();
    } else {//from   w  w w . j  a  va  2 s . c o m
        return null;
    }

}

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From source file:justdailscrapper.vik.utility.FetchPageWithoutProxy.java

public static String fetchPageSourcefromClientGoogle(URI newurl, List<ProxyImport> proxyList)
        throws IOException, InterruptedException {

    Random r = new Random();

    ProxyImport obj = proxyList.get(r.nextInt(proxyList.size()));

    String ip = obj.proxyIP;//w w  w . ja va 2  s. c o  m
    int portno = Integer.parseInt(obj.proxyPort);
    String username = "";
    String password = "";
    if (obj.proxyLen > 2) {
        username = obj.proxyUserName;
        password = obj.proxyPassword;
    }

    //        int portNo = generateRandomPort();
    CredentialsProvider credsprovider = new BasicCredentialsProvider();
    credsprovider.setCredentials(new AuthScope(ip, portno),
            new UsernamePasswordCredentials(username, password));
    HttpHost proxy = new HttpHost(ip, portno);
    //-----------------------------------------------------------------------
    RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(5000)
            .setConnectionRequestTimeout(5000).build();

    CloseableHttpClient httpclient = HttpClients.custom().setDefaultCredentialsProvider(credsprovider)
            .setUserAgent("Mozilla/5.0 (Windows NT 6.3; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0")
            .setDefaultRequestConfig(requestConfig).setProxy(proxy).build();
    String responsebody = "";
    String responsestatus = null;
    int count = 0;
    try {
        HttpGet httpget = new HttpGet(newurl);
        httpget.addHeader("Accept", "*/*");
        httpget.addHeader("Accept-Encoding", "gzip, deflate, br");
        httpget.addHeader("Accept-Language", "en-US,en;q=0.5");
        httpget.addHeader("Host", "www.justdial.com");
        httpget.addHeader("Referer", "https://www.justdial.com/Bangalore/Yamaha-Two-Wheeler-Dealers");
        httpget.addHeader("Connection", "keep-alive");
        httpget.addHeader("X-Requested-With", "XMLHttpReques");

        System.out.println("Response status " + httpget.getRequestLine());
        CloseableHttpResponse resp = httpclient.execute(httpget);
        responsestatus = resp.getStatusLine().toString();
        if (responsestatus.contains("503") || responsestatus.contains("502") || responsestatus.contains("403")
                || responsestatus.contains("400") || responsestatus.contains("407")
                || responsestatus.contains("401") || responsestatus.contains("402")
                || responsestatus.contains("404") || responsestatus.contains("405")
                || responsestatus.contains("SSLHandshakeException") || responsestatus.contains("999")
                || responsestatus.contains("ClientProtocolException")
                || responsestatus.contains("SocketTimeoutException") || "".equals(responsestatus)) {
            Thread.sleep(10000);
            do {
                count++;
                responsebody = fetchPageSourcefromClientGoogleSecond(newurl, proxyList);
                if (responsebody == null) {
                    Thread.sleep(10000);
                    System.out.println("PROX FAILURE");
                }
                if (count > 20) {
                    Thread.sleep(1000);
                    break;
                }
            } while (responsebody == null || "".equals(responsebody));
        } else {
            HttpEntity entity = resp.getEntity();
            System.out.println(resp.getStatusLine());
            if (entity != null) {
                System.out.println("Response content length: " + entity.getContentLength());
                BufferedReader in = new BufferedReader(new InputStreamReader(entity.getContent()));
                String inputLine;
                while ((inputLine = in.readLine()) != null) {
                    responsebody = new StringBuilder().append(responsebody).append(inputLine).toString();
                }
                // writeResponseFile(responsebody, pagename);
            }
            EntityUtils.consume(entity);
        }
    } catch (IOException | IllegalStateException e) {
        System.out.println("Exception = " + e);
        do {
            count++;
            responsebody = fetchPageSourcefromClientGoogleSecond(newurl, proxyList);
            if (responsebody == null) {
                System.out.println("PROX FAILURE");
            }
            if (count > 15) {
                Thread.sleep(50000);
                //                    responsebody = fetchPageSourcefromClientGoogleSecond(newurl);
                break;
            }
        } while (responsebody == null || "".equals(responsebody));
    } finally {
        httpclient.close();
    }
    return responsebody;
}

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From source file:com.saax.gestorweb.util.DAOAleatorio.java

public static EmpresaCliente getEmpresaClienteAleatoria(EntityManager em, Empresa e) {
    List<EmpresaCliente> empresaClientes = em.createNamedQuery("EmpresaCliente.findByEmpresa")
            .setParameter("empresa", e).getResultList();
    return empresaClientes.get(new Random().nextInt(empresaClientes.size() - 1));
}

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From source file:onlineBoutique.service.GenerationCodePromoService.java

public void generationDunCodePromo(CodePromo codePromo) {
    Random rand = new Random();
    Integer max = 9999;/*from   w  ww  . j  ava  2 s . co m*/
    Integer min = 1000;
    Integer numAleatoire = rand.nextInt(max - min + 1) + min;

    codePromo.setCodePromo(numAleatoire.toString());
    codePromoService.save(codePromo);
}

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From source file:Main.java

public Main() {
    for (int i = 0; i < panels.length; i++) {
        final String[] labels = new String[] { "0", "1" };
        final Random rand = new Random();
        int index = rand.nextInt(labels.length);
        String randomTitle = labels[index];
        final JLabel label = new JLabel(randomTitle, JLabel.CENTER);
        Timer lblt = new Timer(00, new ActionListener() {
            @Override/* ww w  .  j a v a 2  s.c om*/
            public void actionPerformed(ActionEvent ae) {
                label.setText(labels[rand.nextInt(labels.length)]);
            }
        });
        lblt.setRepeats(true);
        lblt.start();
        label.setForeground(Color.green);
        label.setVerticalAlignment(JLabel.CENTER);
        panels[i] = new JPanel();
        panels[i].setBackground(Color.BLACK);
        panels[i].add(label);
        frame.getContentPane().add(panels[i]);
    }
    frame.setLayout(new GridLayout(grid, grid));
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setExtendedState(java.awt.Frame.MAXIMIZED_BOTH);
    frame.setVisible(true);

    ActionListener action = new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            for (int i = 0; i < panels.length; i++) {
                Color mix = new Color(255, 255, 255);
                Random random = new Random();
                int r = random.nextInt(255);
                int g = random.nextInt(255);
                int b = random.nextInt(255);

                if (mix != null) {
                    r = (r + mix.getRed()) / 2;
                    g = (g + mix.getGreen()) / 2;
                    b = (b + mix.getBlue()) / 2;
                }
                Color color = new Color(r, g, b);
                panels[i].setBackground(color);
            }
        }
    };

    t = new Timer(00, action);
    t.setRepeats(true);
    t.start();
}

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