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:org.eclipse.swt.snippets.Snippet333.java

protected static void setBackground(Display display, Control control) {
    Random randomGenerator = new Random();
    int nextColor = randomGenerator.nextInt(100) + randomGenerator.nextInt(100);
    control.setBackground(display.getSystemColor(colors[nextColor % colors.length]));
}

From source file:net.dovemq.transport.link.LinkTestUtils.java

public static CAMQPMessagePayload createMessagePayload(Random randomGenerator) {
    int sectionSize = 256 * (randomGenerator.nextInt(10) + 1);
    String str = RandomStringUtils.randomAlphanumeric(sectionSize);
    return new CAMQPMessagePayload(str.getBytes());
}

From source file:Main.java

public static String getRandomString(int len) {
    String returnStr = "";
    char[] ch = new char[len];
    Random rd = new Random();
    for (int i = 0; i < len; i++) {
        ch[i] = (char) (rd.nextInt(9) + 97);
    }/*  w  w  w. ja va 2s . c om*/
    returnStr = new String(ch);
    return returnStr;
}

From source file:Main.java

public static int[] randomIntArray(int length) {
    int[] ran = new int[length];
    Random random = new Random();
    for (int n = 0; n < ran.length; n++) {
        ran[n] = random.nextInt(100);
    }//from   w w w.j a v  a2  s.com
    return ran;
}

From source file:fakedatamaker.util.RandomFileUtil.java

/**
 * /* w w w.  j av  a  2 s.c om*/
 * @param filePath
 * @param encoding
 * @return
 */
public static String getRandomFileLine(String filePath, String encoding) {
    String result = null;

    try {
        File file = new File(filePath);
        List<String> cityLines = FileUtils.readLines(file, encoding);
        int numberOfCities = cityLines.size();
        Random r = new Random();
        int cityLineNum = r.nextInt(numberOfCities);

        result = cityLines.get(cityLineNum);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return result;
}

From source file:Main.java

/**
 * Returns a valid IP v4 address.//  ww  w.j a  va  2  s . co  m
 *
 * @return [0-255].[0-255].[0-255].[0-255]
 */
public static String generateRandomIp() {
    try {
        Random r = new Random();
        String ip = r.nextInt(256) + "." + r.nextInt(256) + "." + r.nextInt(256) + "." + r.nextInt(256);
        if (isValidIp(ip)) {
            return ip;
        } else {
            return generateRandomIp();
        }
    } catch (Exception e) {
    }
    return "127.0.0.1";
}

From source file:Main.java

public static Calendar getRandomApodDate() {
    Calendar newCalendar = Calendar.getInstance();

    Calendar today = Calendar.getInstance();
    int currentYear = today.get(Calendar.YEAR);
    int currentMonth = today.get(Calendar.MONTH);
    int currentDay = today.get(Calendar.DATE);

    int firstApodYear = 1995;
    int firstApodMonth = 5;
    int firstApodDay = 20;

    Random rnd = new Random();
    int newYear = rnd.nextInt(currentYear - firstApodYear + 1) + firstApodYear;

    int minMonth = 0;
    int maxMonth = 11;
    if (newYear == firstApodYear)
        minMonth = firstApodMonth;/*from  www  . jav  a 2s .  co m*/
    if (newYear == currentYear)
        maxMonth = currentMonth;
    int newMonth = rnd.nextInt(maxMonth - minMonth + 1) + minMonth;

    newCalendar.set(newYear, newMonth, 1);

    int minDay = 1;
    int maxDay = newCalendar.getActualMaximum(Calendar.DAY_OF_MONTH);
    if (newYear == firstApodYear && newMonth == firstApodMonth)
        minDay = firstApodDay;
    if (newYear == currentYear && newMonth == currentMonth)
        maxDay = currentDay;
    int newDay = rnd.nextInt(maxDay - minDay + 1) + minDay;

    newCalendar.set(newYear, newMonth, newDay);
    return newCalendar;
}

From source file:Main.java

public static String generateToken() {
    char[] chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789".toCharArray();
    StringBuilder sb = new StringBuilder();
    Random random = new Random();

    for (int i = 0; i < 40; i++) {
        char c = chars[random.nextInt(chars.length)];
        sb.append(c);//from www  .  j  a  va2 s.c  om
    }

    return sb.toString();
}

From source file:Main.java

public static void saveImage(Bitmap bmp) {
    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/abcxyz");
    myDir.mkdirs();/*from w w  w . j a  v a2s  .c om*/
    Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);
    String name = "Image-" + n + ".jpg";
    File file = new File(myDir, name);
    if (file.exists())
        file.delete();

    try {
        FileOutputStream out = new FileOutputStream(file);
        bmp.compress(Bitmap.CompressFormat.JPEG, 100, out);
        out.flush();
        out.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

From source file:Main.java

public static void permute(Random random, ArrayList array) {
    for (int i = 0; i < array.size(); i++) {
        int j = i + random.nextInt(array.size() - i);
        Object tmp = array.get(i);
        array.set(i, array.get(j));/* w w  w.ja  v a2s  .  c  o m*/
        array.set(j, tmp);
    }
}