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:dtu.ds.warnme.utils.RandomUtils.java

public static float randomBearing() {
    float[] values = new float[] { 0f, 90f, 180f, 270f };
    int idx = new Random().nextInt(values.length);
    return values[idx];
}

From source file:com.eventsourcing.hlc.NTPServerTimeProviderTest.java

@DataProvider(name = "delays", parallel = true)
public static Iterator<Object[]> delays() {
    return IntStream.generate(() -> new Random().nextInt(3000))
            .limit(ForkJoinPool.getCommonPoolParallelism() * 10).boxed().map(i -> new Object[] { i })
            .collect(Collectors.toList()).iterator();
}

From source file:com.skilrock.lms.common.utility.AutoGenerate.java

public static String autoPassword() {
    Random r = new Random();

    StringBuffer newString = new StringBuffer();
    // No of Big letters in password
    int a1 = r.nextInt(6) + 1;
    // No of small letters in password
    int a2 = r.nextInt(7 - a1) + 1;
    // no on numbers
    int a3 = 8 - a1 - a2;

    for (int j = 0; j < a1; j++) {
        char c1 = (char) (r.nextInt(26) + 65);
        // AL.add(new Character(c1));
        newString.append(new Character(c1));
    }/*from  ww  w . j  av a  2 s . co m*/
    for (int j = 0; j < a2; j++) {
        char c1 = (char) (r.nextInt(26) + 97);
        // AL.add(new Character(c1));
        newString.append(new Character(c1));
    }
    for (int j = 0; j < a3; j++) {
        char c1 = (char) (r.nextInt(9) + 48);
        // AL.add(new Character(c1));
        newString.append(new Character(c1));
    }
    //logger.debug("pwd = " + newString.toString());
    return newString.toString();
}

From source file:Main.java

/**
 * Using like subList() but it take randoms elements.
 *
 * @param list/*from  w  w w  .j av a  2s .c  om*/
 * @param sizeOfSubList
 */
public static <E> void randomSubList(List<E> list, int sizeOfSubList) {
    List<E> subList = Collections.emptyList();
    if (isNotEmpty(list) && list.size() > sizeOfSubList) {
        subList = new ArrayList<E>(sizeOfSubList);
        Random generator = new Random();
        for (int i = 0; i < sizeOfSubList; i++) {
            int random = generator.nextInt(list.size());
            subList.add(list.get(random));
            list.remove(random);
        }
    }
    list.clear();
    list.addAll(subList);
}

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 2 s.  co  m
        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);
}

From source file:fr.esecure.banking.metier.utils.PasswordGenerator.java

public static String genererDefaultPassword() {
    int n;/*from   www . jav  a  2s. c  o  m*/
    String password = "";
    Random r = new Random();
    for (int i = 0; i < NChar; i++) {
        n = r.nextInt(4); // gnere un nombre alatoire entre 0 et 3
        if (n == 0)
            password += maj[r.nextInt(maj.length)];
        else if (n == 1)
            password += min[r.nextInt(min.length)];
        else if (n == 2)
            password += chiffre[r.nextInt(chiffre.length)];
        else
            password += charSpecial[r.nextInt(charSpecial.length)];
    }
    return password;
}

From source file:org.couchbase.mock.http.query.QueryServer.java

/**
 * This is the equivalent to 'dropping' indexes
 */
public static void resetIndexState() {
    randNumber = new Random().nextInt();
}

From source file:com.wabacus.util.FileLockTools.java

public static Object lock(String lockfile, int waitsec, int maxtimes) {
    Object lockresource = lock(lockfile);
    Random random = new Random();
    int times = 0;
    while (lockresource == null) {
        if (times++ >= maxtimes) {
            log.debug("??" + lockfile + "?" + maxtimes + "?");
            break;
        }//from   w w  w. ja  v a2  s.co m
        try {
            Thread.sleep(random.nextInt(waitsec) * 1000);
        } catch (Exception e) {
            e.printStackTrace();
        }
        lockresource = lock(lockfile);
    }
    return lockresource;
}

From source file:Points.java

public void paintComponent(Graphics g) {
    super.paintComponent(g);

    Graphics2D g2d = (Graphics2D) g;

    g2d.setColor(Color.red);/*from   w  w w  .j a v a  2 s  .  c om*/

    for (int i = 0; i <= 100000; i++) {
        Dimension size = getSize();
        int w = size.width;
        int h = size.height;

        Random r = new Random();
        int x = Math.abs(r.nextInt()) % w;
        int y = Math.abs(r.nextInt()) % h;
        g2d.drawLine(x, y, x, y);
    }
}

From source file:ListOfCitys.CityList.java

public static JSONObject getCityNameForCountry(String countryName, String zipName) {
    List<String> cities = new ArrayList<>();
    List<String> citiesList = new ArrayList<>();
    JSONObject obj = new JSONObject();
    try {/*from w  ww .  j av a 2  s  .co m*/
        WebService.setUserName("nane");
        ToponymSearchCriteria searchCriteria = new ToponymSearchCriteria();
        searchCriteria.setQ(countryName);
        ToponymSearchResult searchResult;
        searchResult = WebService.search(searchCriteria);
        for (int i = 0; i < searchResult.getToponyms().size(); ++i) {
            cities.add(searchResult.getToponyms().get(i).getName());
        }
        for (int j = 0; j < 3; ++j) {
            citiesList.add(cities.get(new Random().nextInt(cities.size())));
        }
        obj.put(zipName, citiesList.toArray());
        return obj;
    } catch (Exception ex) {
        Logger.getLogger(CityList.class.getName()).log(Level.SEVERE, null, ex);
    }
    return obj;
}