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

public static int getRandomColor() {
    Random rand = new Random();
    return Color.argb(100, rand.nextInt(256), rand.nextInt(256), rand.nextInt(256));
}

From source file:Main.java

public static int handleRange(String string, String splitter) {
    Random rand = new Random();
    int result;/*from   w  w w .ja v a  2 s . c  om*/
    int range;
    int loc;
    String[] splitString = string.split(splitter);
    if (getDouble(splitString[0], 0) > getDouble(splitString[1], 0)) {
        range = (int) ((getDouble(splitString[0], 0) * 100) - (getDouble(splitString[1], 0) * 100));
        loc = (int) (getDouble(splitString[1], 0) * 100);
    } else {
        range = (int) ((getDouble(splitString[1], 0) * 100) - (getDouble(splitString[0], 0) * 100));
        loc = (int) (getDouble(splitString[0], 0) * 100);
    }
    result = (loc + rand.nextInt(range + 1)) / 100;
    return result;
}

From source file:Main.java

public static byte[] getRandomBuffer(int size) {
    byte[] buffer = new byte[size];
    Random random = new Random();
    random.nextBytes(buffer);/*from  w  w  w  .ja  v a 2s . co m*/
    return buffer;
}

From source file:Main.java

public static int getRandom(int min, int max) {
    Random random = new Random();
    int s = random.nextInt(max) % (max - min + 1) + min;
    return s;//from   w  w  w .j  av a 2  s. c  o  m
}

From source file:Main.java

public static int ramdomMinMax(int min, int max) {

    Random random = new Random();

    int rs = -1;/*w ww  .  j  a  v a2  s  .  c o  m*/

    while (rs < min || rs > max) {

        rs = random.nextInt(max);
    }

    return rs;
}

From source file:Main.java

public static float ramdomMinMaxFloat(float min, float max) {

    Random random = new Random();

    float rs = -1;

    while (rs < min || rs > max) {

        rs = random.nextFloat();/*w  ww.ja v a  2  s . c om*/
    }

    return rs;
}

From source file:com.play.engine.RecommendEngine.java

public static void main(String[] args) {
    ShopSearchClient client = new ShopSearchClient();
    double lng = 116.487823;
    double lat = 39.88445;
    int resultCnt = 1000;
    int afford = 1;
    List<ShopInfo> foodShops = client.getRecFoodShop(lng, lat, resultCnt, afford);

    System.out.println();// w  ww  . j  a v  a2s.  c o  m
    System.out.println();

    List<ShopInfo> amuseShops = client.getRecAmuseShop(lng, lat, resultCnt, afford);

    System.out.println();
    System.out.println();

    List<ShopInfo> hotelShops = client.getRecHotelShop(lng, lat, resultCnt, afford);

    long beginTime = System.currentTimeMillis() - 10 * TimeUtil.ONE_HOUR;
    long endTime = beginTime + 25 * TimeUtil.ONE_HOUR + new Random().nextInt(500000);

    ShopInfoListBean bean = new ShopInfoListBean(beginTime, endTime, hotelShops, foodShops, amuseShops);

    RecommendEngine engine = new RecommendEngine();
    RecmdResult result = engine.getRecmdResult(bean);
    System.out.println("Final Result:\n" + result);
}

From source file:Main.java

public static ByteArrayInputStream getRandomDataStream(int length) {
    final Random randGenerator = new Random();
    final byte[] buff = new byte[length];
    randGenerator.nextBytes(buff);/*  w  w  w .jav  a2s .c  o m*/
    return new ByteArrayInputStream(buff);
}

From source file:Main.java

private static Object getRandomValue(Class<?> type) {
    if (type.isAssignableFrom(Double.class)) {
        return new Random().nextDouble();
    }//w w w  .java 2s  .c om
    if (type.isAssignableFrom(Short.class)) {
        return (short) new Random().nextInt();
    }
    if (type.isAssignableFrom(Long.class)) {
        return new Random().nextLong();
    }
    if (type.isAssignableFrom(Integer.class)) {
        return new Random().nextInt();
    }
    if (type.isAssignableFrom(String.class)) {
        return "" + new Random().nextInt();
    }
    if (type.isAssignableFrom(Boolean.class)) {
        return new Random().nextBoolean();
    }
    if (type.isAssignableFrom(Date.class)) {
        return new Date(new Random().nextLong());
    }
    if (type.isAssignableFrom(List.class)) {
        Class<?> listType = (Class<?>) ((ParameterizedType) type.getClass().getGenericSuperclass())
                .getActualTypeArguments()[0];
        return getRandomCollection(listType);
    }
    return null;
}

From source file:Main.java

static File make_tmpdir(Context context, SQLiteDatabase db) throws Exception {

    File extdir = Environment.getExternalStorageDirectory();
    File tmp_top = new File(extdir, "tmp_LongText");
    if (!tmp_top.exists()) {
        if (!tmp_top.mkdir())
            throw new Exception("cannot create directory: " + tmp_top.getPath());
    }//from   w w w  .  ja v a  2  s . co m
    if (!tmp_top.canWrite())
        throw new Exception("missing permission to write to " + tmp_top.getPath());

    File tmpdir;
    Random r = new Random();
    do {
        tmpdir = new File(tmp_top, String.format("%d", r.nextInt()));
    } while (tmpdir.exists());
    if (!tmpdir.mkdir())
        throw new Exception("cannot create directory: " + tmp_top.getPath());
    if (!tmpdir.canWrite())
        throw new Exception("missing permission to write to " + tmp_top.getPath());
    ContentValues v = new ContentValues();
    v.put("pid", Process.myPid());
    v.put("tmpdir", tmpdir.getPath());
    v.put("ctime", System.currentTimeMillis());
    db.insert("tmpdir", null, v);

    return tmpdir;
}