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:com.clonephpscrapper.utility.FetchPageWithProxy.java

public static int generateRandomPort() {

    int portNo;//from   ww w . j  av  a  2 s.c om
    Random random = new Random();
    int[] portList = new int[98];
    int portBegin = 1601; //1601

    for (int k = 0; k < portList.length; k++) {
        portList[k] = portBegin;
        portBegin = portBegin + 1;
    }

    int num = random.nextInt(98);
    portNo = portList[num];
    return portNo;
}

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From source file:com.qmetry.qaf.automation.data.BaseDataBean.java

public static String getRandomValue(String... values) {
    if ((values == null) || (values.length == 0)) {
        return "";
    }//from w w  w  . ja  v  a 2  s  .c  o m
    if ((values.length == 1) && getBundle().containsKey(values[0])) {
        values = getBundle().getStringArray(values[0], values[0]);
    }
    Random rand = new Random();
    int r = rand.nextInt(values.length);

    return values[r];
}

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From source file:com.suiveg.utils.encryption.algorithms.Crypt.java

/**
 * Generate a salt based on Alpha-chars/*from  w w  w.j a  va 2  s.  c  om*/
 *
 * @return generated salt
 */
public static String generateSalt() {
    String salt = "";
    Random r = new Random();

    while (salt.length() < 2) {
        salt += alphabet.charAt(r.nextInt(alphabet.length()));
    }

    return salt;
}

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From source file:com.maydesk.base.util.PDUtil.java

public static String createLogin(int charCount) {
    StringBuilder login = new StringBuilder();
    Random r = new Random();
    for (int i = 0; i < charCount; i++) {
        if (i % 3 == 0 && i != 0) {
            login.append('-');
        }/* w w w. j a  v  a 2  s.  c  o m*/
        login.append(arrayChars[r.nextInt(arrayChars.length)]);
    }
    return login.toString();
}

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From source file:com.tjtolley.roborally.game.BoardDefinition.java

public static BoardDefinition randomConfiguration(String name, int height, int width) {
    Random r = new Random();
    List<List<Tile>> board = Lists.newArrayList();
    Tile.TileType[] values = Tile.TileType.values();
    final Direction[] dirValues = Direction.values();
    for (int x = 0; x < width; x++) {
        final ArrayList<Tile> column = Lists.<Tile>newArrayList();
        board.add(x, column);//from   w w  w  . j  a  v  a 2s  .  c om
        for (int y = 0; y < height; y++) {
            int valIdx = r.nextInt(values.length);
            int dirIdx = r.nextInt(dirValues.length);
            column.add(y, new Tile(values[valIdx], x, y, dirValues[dirIdx], EdgeType.EMPTY, EdgeType.EMPTY,
                    EdgeType.EMPTY, EdgeType.EMPTY));
        }
    }
    return new BoardDefinition(name, board, width, height);
}

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From source file:com.github.braully.graph.DatabaseFacade.java

private static String saveConsole(List<String> consoleOut, String fileGraphName) {
    if (consoleOut == null || consoleOut.isEmpty()) {
        return null;
    }/*  w  ww .j  a v  a2s  .  c om*/
    String fileName = fileGraphName;

    char[] chars = "abcdefghijklmnopqrstuvwxyz".toCharArray();
    StringBuilder sb = new StringBuilder();
    Random random = new Random();
    for (int i = 0; i < 10; i++) {
        char c = chars[random.nextInt(chars.length)];
        sb.append(c);
    }

    fileName = fileGraphName + ".log";
    File fileOut = new File(DATABASE_DIRECTORY_GRAPH + File.separator + fileName);
    try {
        BufferedWriter bw = new BufferedWriter(new FileWriter(fileOut));
        for (String l : consoleOut) {
            bw.write(l);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return fileName;
}

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From source file:edu.mayo.informatics.lexgrid.convert.directConversions.UmlsCommon.LoadRRFToDB.java

public static String[] validateRRF(URI rrfLocation, boolean skipNonLexGridFiles, LgMessageDirectorIF md)
        throws Exception {
    Random r = new Random();
    // generate a random db label
    return createAndLoadTables(rrfLocation, skipNonLexGridFiles, false, "jdbc:hsqldb:mem:" + r.nextInt(100),
            "org.hsqldb.jdbcDriver", "sa", "", md, true);
}

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From source file:com.github.braully.graph.DatabaseFacade.java

public static String saveGraph(UndirectedSparseGraphTO graph) {
    if (graph == null) {
        return null;
    }/*from   www  . j av  a2  s . com*/
    String fileName = graph.getName();

    char[] chars = "abcdefghijklmnopqrstuvwxyz".toCharArray();
    StringBuilder sb = new StringBuilder();
    //        try {
    //            MessageDigest md5 = MessageDigest.getInstance("MD5");
    //            md5.
    //        } catch (Exception e) {
    Random random = new Random();
    for (int i = 0; i < 10; i++) {
        char c = chars[random.nextInt(chars.length)];
        sb.append(c);
    }
    //        }
    fileName = fileName + "-" + sb.toString() + ".json";

    try {
        ObjectMapper mapper = new ObjectMapper();
        mapper.writeValue(new File(DATABASE_DIRECTORY_GRAPH + File.separator + fileName), graph);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return fileName;
}

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From source file:Main.java

/**
 * Fills the array with random floats.  Values will be between min (inclusive) and
 * max (inclusive).//from   ww  w. j ava  2 s .  com
 */
public static void genRandomFloats(long seed, float min, float max, float array[], boolean includeExtremes) {
    Random r = new Random(seed);
    int minExponent = Math.min(Math.getExponent(min), 0);
    int maxExponent = Math.max(Math.getExponent(max), 0);
    if (minExponent < -6 || maxExponent > 6) {
        // Use an exponential distribution
        int exponentDiff = maxExponent - minExponent;
        for (int i = 0; i < array.length; i++) {
            float mantissa = r.nextFloat();
            int exponent = minExponent + r.nextInt(maxExponent - minExponent);
            int sign = (min >= 0) ? 1 : 1 - r.nextInt(2) * 2; // -1 or 1
            float rand = sign * mantissa * (float) Math.pow(2.0, exponent);
            if (rand < min || rand > max) {
                continue;
            }
            array[i] = rand;
        }
    } else {
        // Use a linear distribution
        for (int i = 0; i < array.length; i++) {
            float rand = r.nextFloat();
            array[i] = min + rand * (max - min);
        }
    }
    // Seed a few special numbers we want to be sure to test.
    for (int i = 0; i < sInterestingDoubles.length; i++) {
        float f = (float) sInterestingDoubles[i];
        if (min <= f && f <= max) {
            array[r.nextInt(array.length)] = f;
        }
    }
    array[r.nextInt(array.length)] = min;
    array[r.nextInt(array.length)] = max;
    if (includeExtremes) {
        array[r.nextInt(array.length)] = Float.NaN;
        array[r.nextInt(array.length)] = Float.POSITIVE_INFINITY;
        array[r.nextInt(array.length)] = Float.NEGATIVE_INFINITY;
        array[r.nextInt(array.length)] = Float.MIN_VALUE;
        array[r.nextInt(array.length)] = Float.MIN_NORMAL;
        array[r.nextInt(array.length)] = Float.MAX_VALUE;
        array[r.nextInt(array.length)] = -Float.MIN_VALUE;
        array[r.nextInt(array.length)] = -Float.MIN_NORMAL;
        array[r.nextInt(array.length)] = -Float.MAX_VALUE;
    }
}

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From source file:org.osiam.tests.performance.tools.TestDataCreation.java

private static ByteBuffer getBigByteBuffer(Integer countCurrentUser) {
    String userId = countCurrentUser.toString();
    byte[] bytes = new byte[userId.length() + MIN_COUNT_BYTE_BUFFER];
    int actPosition;

    // first comes the id
    char[] userChars = userId.toCharArray();
    for (int count = 0; count < userChars.length; count++) {
        bytes[count] = (byte) userChars[count];
    }//from w  w w.j av  a  2 s.  c om
    actPosition = userChars.length;

    // now we add random bytes
    Random random = new Random();
    String allowedChars = "0123456789abcdefghijklmnopqrstuvwxyz";
    int max = allowedChars.length();
    for (int i = 0; i < MIN_COUNT_BYTE_BUFFER; i++) {
        int value = random.nextInt(max);
        bytes[actPosition++] = (byte) allowedChars.charAt(value);
    }

    ByteBuffer ret = ByteBuffer.wrap(new byte[bytes.length]);
    ret.put(bytes);
    ret.flip();

    return ret;
}

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