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(long seed) 

Source Link

Document

Creates a new random number generator using a single long seed.

Usage

From source file:Main.java

public static int getRandom() {
    Random ran = new Random(System.currentTimeMillis());
    int ret = ran.nextInt();
    ret = Math.abs(ret);//from   w w w .  j  a  v  a  2s.  c o m
    return ret;
}

---

From source file:Main.java

@SuppressWarnings("unused")
public static String getRandomNumber(int count) {
    Random rdm = new Random(System.currentTimeMillis());
    String random = "";
    for (int i = 0; i < count; i++) {
        String str = String.valueOf((int) (Math.random() * 10 - 1));
        random = random + str;/*from ww w.j  a  va2s  . co  m*/
    }
    return random;
}

---

From source file:Main.java

public static int generateRandomColour(long seed) {
    Random random = new Random(seed);
    int color = Color.argb(random.nextInt(), random.nextInt(), random.nextInt(), random.nextInt());

    float[] hsv = new float[3];
    Color.colorToHSV(color, hsv);

    //Adjust the saturation value, less than 1 is darker, greater than 1 is brighter
    hsv[2] *= 0.8;//from w ww  . jav  a  2  s.c  o  m
    return Color.HSVToColor(hsv);
}

---

From source file:Main.java

/** Returns a random integer between 0 and n-1 */
public static int nextInt(int n) {
    Random rand = new Random(seed);
    return Math.abs(rand.nextInt()) % n;
}

---

From source file:Main.java

private static String generateNonce(int length) {
    Random random = new Random(System.currentTimeMillis());
    if (length < 10)
        length = 10;/*from  w w  w.j  a  v a  2 s.c  o  m*/

    int MAX_LEN = NONCE_SAMPLE.length();
    StringBuffer buf = new StringBuffer();
    for (int i = 0; i < length; i++) {
        buf.append(NONCE_SAMPLE.charAt(random.nextInt(MAX_LEN)));
    }
    return buf.toString();
}

---

From source file:Main.java

public static String encryptPassword(String s) {
    int i = 10 + (new Random(SystemClock.currentThreadTimeMillis())).nextInt(90);
    return (new StringBuilder()).append(md5((new StringBuilder()).append(i).append(s).toString())).append(":")
            .append(i).toString();//w w w  .  j  a  va2s  .  c o  m
}

---

From source file:ffx.numerics.fft.RowMajorComplex3DCuda.java

/**
 * <p>//from w  w  w .j  a v a  2s. c om
 * main</p>
 *
 * @param args an array of {@link java.lang.String} objects.
 * @throws java.lang.Exception if any.
 */
public static void main(String[] args) throws Exception {
    int dimNotFinal = 64;
    int reps = 10;
    if (args != null) {
        try {
            dimNotFinal = Integer.parseInt(args[0]);
            if (dimNotFinal < 1) {
                dimNotFinal = 64;
            }
            reps = Integer.parseInt(args[2]);
            if (reps < 1) {
                reps = 5;
            }
        } catch (Exception e) {
        }
    }
    final int dim = dimNotFinal;

    System.out.println(String.format(
            " Initializing a %d cubed grid.\n" + " The best timing out of %d repititions will be used.", dim,
            reps));

    final int dimCubed = dim * dim * dim;

    /**
     * Create an array to save the initial input and result.
     */
    double orig[] = new double[dimCubed];
    double answer[] = new double[dimCubed];

    double data[] = new double[dimCubed * 2];
    double recip[] = new double[dimCubed];

    Random random = new Random(1);
    for (int x = 0; x < dim; x++) {
        for (int y = 0; y < dim; y++) {
            for (int z = 0; z < dim; z++) {
                int index = RowMajorComplex3D.iComplex3D(x, y, z, dim, dim);
                orig[index / 2] = random.nextDouble();
                recip[index / 2] = orig[index / 2];
            }
        }
    }

    RowMajorComplex3D complex3D = new RowMajorComplex3D(dim, dim, dim);
    RowMajorComplex3DParallel complex3DParallel = new RowMajorComplex3DParallel(dim, dim, dim,
            new ParallelTeam(), IntegerSchedule.fixed());
    RowMajorComplex3DCuda complex3DCUDA = new RowMajorComplex3DCuda(dim, dim, dim, data, recip);
    Thread cudaThread = new Thread(complex3DCUDA);

    cudaThread.setPriority(Thread.MAX_PRIORITY);
    cudaThread.start();

    double toSeconds = 0.000000001;
    long parTime = Long.MAX_VALUE;
    long seqTime = Long.MAX_VALUE;
    long clTime = Long.MAX_VALUE;

    complex3D.setRecip(recip);
    for (int i = 0; i < reps; i++) {
        for (int j = 0; j < dimCubed; j++) {
            data[j * 2] = orig[j];
            data[j * 2 + 1] = 0.0;
        }
        long time = System.nanoTime();
        complex3D.convolution(data);
        time = (System.nanoTime() - time);
        System.out.println(String.format(" %2d Sequential: %8.3f", i + 1, toSeconds * time));
        if (time < seqTime) {
            seqTime = time;
        }
    }

    for (int j = 0; j < dimCubed; j++) {
        answer[j] = data[j * 2];
    }

    complex3DParallel.setRecip(recip);
    for (int i = 0; i < reps; i++) {
        for (int j = 0; j < dimCubed; j++) {
            data[j * 2] = orig[j];
            data[j * 2 + 1] = 0.0;
        }
        long time = System.nanoTime();
        complex3DParallel.convolution(data);
        time = (System.nanoTime() - time);
        System.out.println(String.format(" %2d Parallel:   %8.3f", i + 1, toSeconds * time));
        if (time < parTime) {
            parTime = time;
        }
    }

    double maxError = Double.MIN_VALUE;
    double rmse = 0.0;
    for (int i = 0; i < dimCubed; i++) {
        double error = Math.abs(answer[i] - data[2 * i]);
        if (error > maxError) {
            maxError = error;
        }
        rmse += error * error;
    }
    rmse /= dimCubed;
    rmse = Math.sqrt(rmse);
    logger.info(String.format(" Parallel RMSE:   %12.10f, Max: %12.10f", rmse, maxError));
    for (int i = 0; i < reps; i++) {
        for (int j = 0; j < dimCubed; j++) {
            data[j * 2] = orig[j];
            data[j * 2 + 1] = 0.0;
        }
        long time = System.nanoTime();
        complex3DCUDA.convolution(data);
        time = (System.nanoTime() - time);
        System.out.println(String.format(" %2d CUDA:     %8.3f", i + 1, toSeconds * time));
        if (time < clTime) {
            clTime = time;
        }
    }

    maxError = Double.MIN_VALUE;
    double avg = 0.0;
    rmse = 0.0;
    for (int i = 0; i < dimCubed; i++) {
        double error = Math.abs((answer[i] - data[2 * i]) / dimCubed);
        avg += error;
        if (error > maxError) {
            maxError = error;
        }
        rmse += error * error;
    }
    rmse /= dimCubed;
    avg /= dimCubed;
    rmse = Math.sqrt(rmse);
    logger.info(String.format(" CUDA RMSE:   %12.10f, Max: %12.10f, Avg: %12.10f", rmse, maxError, avg));

    complex3DCUDA.free();
    complex3DCUDA = null;

    System.out.println(String.format(" Best Sequential Time:  %8.3f", toSeconds * seqTime));
    System.out.println(String.format(" Best Parallel Time:    %8.3f", toSeconds * parTime));
    System.out.println(String.format(" Best CUDA Time:        %8.3f", toSeconds * clTime));
    System.out.println(String.format(" Parallel Speedup: %15.5f", (double) seqTime / parTime));
    System.out.println(String.format(" CUDA Speedup:     %15.5f", (double) seqTime / clTime));
}

---

From source file:Main.java

/**
 * @author TheMrMilchmann//from  w w w. j  ava2 s.  c  o  m
 * @since DerpieLang v1.0.0
 */
public static final <T> T[] fillRandomly(T[] from, T[] into, long seed) {
    Random random = new Random(seed);

    for (int i = 0; i < into.length; i++) {
        into[i] = from[random.nextInt(from.length)];
    }

    return into;
}

---

From source file:Main.java

public static void changeRingtone(Context context) {

    SharedPreferences preferences = context.getSharedPreferences("randomizer", Context.MODE_PRIVATE);
    if (!preferences.getBoolean("active", false))
        return;/* w ww .j  a v a  2  s . c om*/

    RingtoneManager mgr = new RingtoneManager(context);
    Random random = new Random(System.currentTimeMillis());

    int n = random.nextInt(mgr.getCursor().getCount());

    RingtoneManager.setActualDefaultRingtoneUri(context, RingtoneManager.TYPE_RINGTONE, mgr.getRingtoneUri(n));
}

---

From source file:Main.java

public static void changeRingtone(Context context) {
    SharedPreferences sharedPreferences = context.getSharedPreferences("randomizer", Context.MODE_PRIVATE);

    if (!sharedPreferences.getBoolean("active", false)) {
        return;//from w w  w.ja v a2  s  .c  o  m
    } // END if

    RingtoneManager ringtoneManager = new RingtoneManager(context);
    Random random = new Random(System.currentTimeMillis());

    int count = random.nextInt(ringtoneManager.getCursor().getCount());

    RingtoneManager.setActualDefaultRingtoneUri(context, RingtoneManager.TYPE_RINGTONE,
            ringtoneManager.getRingtoneUri(count));
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• »