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:net.minecraftforge.fml.common.registry.VillagerRegistry.java

/**
 * Hook called when spawning a Villager, sets it's profession to a random registered profession.
 *
 * @param entity The new entity/*from  ww  w .  j av a2  s.  c om*/
 * @param rand The world's RNG
 */
public static void setRandomProfession(EntityVillager entity, Random rand) {
    Set<String> entries = INSTANCE.professions.getKeys();
    int prof = rand.nextInt(entries.size());
    //TODO: Grab id range from internal registry
    entity.setProfession(rand.nextInt(5));
}

From source file:com.gm.machine.util.CommonUtils.java

public static String getrannumber() {
    StringBuffer strbufguess = new StringBuffer();
    String strguess = new String();
    int[] nums = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
    Random rannum = new Random();
    int count;/*from   w ww .  ja  v  a2 s .c o  m*/
    int i = 0, temp_i = 0;
    for (int j = 10; j > 4; j--) {
        i = 0;
        temp_i = 0;
        count = rannum.nextInt(j);
        while (i <= count) {
            if (nums[temp_i] == -1) {
                temp_i++;
            } else {
                i++;
                temp_i++;
            }
        }
        strbufguess.append(Integer.toString(nums[temp_i - 1]));
        nums[temp_i - 1] = -1;
    }
    strguess = strbufguess.toString();
    rannum = null;
    strbufguess = null;
    nums = null;
    return strguess;
}

From source file:com.oltpbenchmark.util.CollectionUtil.java

/**
 * Return a random value from the given Collection
 * @param <T>/*from  w w  w.j ava2  s  .com*/
 * @param items
 * @param rand
 * @return
 */
public static <T> T random(Collection<T> items, Random rand) {
    int idx = rand.nextInt(items.size());
    return (CollectionUtil.get(items, idx));
}

From source file:Main.java

public static int handleRange(int i1, int i2) {
    Random rand = new Random();
    int result;/*ww  w  .  ja  v  a  2 s .  c o m*/
    int range;
    int loc;
    if (Double.valueOf(i1) > Double.valueOf(i2)) {
        range = (int) ((Double.valueOf(i1) * 100) - (Double.valueOf(i2) * 100));
        loc = (int) (Double.valueOf(i2) * 100);
    } else {
        range = (int) ((Double.valueOf(i2) * 100) - (Double.valueOf(i1) * 100));
        loc = (int) (Double.valueOf(i1) * 100);
    }
    result = (loc + rand.nextInt(range + 1)) / 100;
    return result;
}

From source file:Main.java

public static <T> List<T> getRandomDistinctElements(final Random random, final List<T> list,
        final int nElements) {
    if (list.size() < nElements)
        throw new IllegalArgumentException("cannot sample " + nElements + " elements from " + list.size());

    // TODO: avoid creating "bowl" collection
    final List<T> bowl = new ArrayList<T>(list);
    final List<T> sample = new ArrayList<T>(nElements);

    for (int i = 0; i < nElements; i++) {
        sample.add(bowl.remove(random.nextInt(bowl.size())));
    }// w  ww  .  j  av  a2 s.co m

    return sample;
}

From source file:com.sonicle.webtop.core.util.IdentifierUtils.java

/**
 * @deprecated use com.sonicle.commons.IdentifierUtils.getRandomAlphaNumericString instead
 * @return/*from w  w w. j av  a  2 s  . c o  m*/
 */
@Deprecated
public static synchronized String getRandomAlphaNumericString(int length) {
    try {
        SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
        Random rand = new Random();
        char buff[] = new char[length];
        for (int i = 0; i < length; ++i) {
            // reseed rand once you've used up all available entropy bits
            if ((i % 10) == 0)
                rand.setSeed(sr.nextLong()); // 64 bits of random!
            buff[i] = VALID_CHARACTERS[rand.nextInt(VALID_CHARACTERS.length)];
        }
        return new String(buff);
    } catch (NoSuchAlgorithmException ex) {
        return null;
    }
}

From source file:ala.soils2sat.DrawingUtils.java

public static Color generateRandomColor(Color mix) {
    Random random = new Random();
    int red = random.nextInt(256);
    int green = random.nextInt(256);
    int blue = random.nextInt(256);

    // mix the color
    if (mix != null) {
        red = (red + mix.getRed()) / 2;//from w  ww .  ja  v a  2 s .  c om
        green = (green + mix.getGreen()) / 2;
        blue = (blue + mix.getBlue()) / 2;
    }

    Color color = new Color(red, green, blue);
    return color;
}

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();/*from   w w  w.j  a v  a2s .c  o m*/
        }
    }
}

From source file:org.imsglobal.lti.LTIUtil.java

/**
* Generates a random string.//w  w w  .j a va 2  s.com
* <p>
* The generated string will only comprise letters (upper- and lower-case) and digits.
*
* @param length Length of string to be generated
*
* @return random string
*/
protected static String getRandomString(int length) {

    String chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

    Random rand = new Random();
    StringBuilder value = new StringBuilder();
    int charsLength = chars.length() - 1;

    for (int i = 0; i < length; i++) {
        value.append(chars.charAt(rand.nextInt(charsLength)));
    }

    return value.toString();

}

From source file:at.illecker.hama.hybrid.examples.summation.SummationBSP.java

static BigDecimal writeSummationInputFile(FileSystem fs, Path dir, int fileCount) throws IOException {

    BigDecimal sum = new BigDecimal(0);
    Random rand = new Random();
    double rangeMin = 0;
    double rangeMax = 100;

    for (int i = 0; i < fileCount; i++) {
        DataOutputStream out = fs.create(new Path(dir, "part" + i));

        // loop between 50 and 149 times
        for (int j = 0; j < rand.nextInt(100) + 50; j++) {
            // generate key value pair inputs
            double randomValue = rangeMin + (rangeMax - rangeMin) * rand.nextDouble();

            String truncatedValue = new BigDecimal(randomValue)
                    .setScale(DOUBLE_PRECISION, BigDecimal.ROUND_DOWN).toString();

            String line = "key" + (j + 1) + "\t" + truncatedValue + "\n";
            out.writeBytes(line);/*from w w  w.  j ava  2  s .c om*/

            sum = sum.add(new BigDecimal(truncatedValue));
            LOG.debug("input[" + j + "]: '" + line + "' sum: " + sum.toString());
        }
        out.close();
    }
    return sum;
}