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:Main.java

public static String getRandomString(int length) {
    if (length <= 0)
        return null;

    StringBuffer sb = new StringBuffer();
    Random r = new Random();
    int range = RANDOM_CHARS.length();
    for (int i = 0; i < length; i++) {
        sb.append(RANDOM_CHARS.charAt(r.nextInt(range)));
    }//  w ww.ja  va 2s .  c  o m
    return sb.toString();
}

From source file:Main.java

public static String generateRandomString(final int len) {
    final String base = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    final Random random = new Random();
    final StringBuffer sb = new StringBuffer();
    for (int i = 0; i < len; i++) {
        final int number = random.nextInt(base.length());
        sb.append(base.charAt(number));//from   w w w.ja  v  a 2  s .c  o  m
    }
    return sb.toString();
}

From source file:Main.java

private static String generateString(Random rng, String characters, int length) {
    char[] text = new char[length];
    for (int i = 0; i < length; i++) {
        text[i] = characters.charAt(rng.nextInt(characters.length()));
    }//from  ww  w  .java  2 s.c  o m
    return new String(text);
}

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

public static void sendMessagesOnLink(CAMQPLinkSender linkSender, int numMessagesToSend) {
    Random randomGenerator = new Random();
    for (int i = 0; i < numMessagesToSend; i++) {
        int randomInt = randomGenerator.nextInt(5);
        CAMQPMessage message = createMessage(randomGenerator);
        linkSender.sendMessage(new CAMQPMessage(message.getDeliveryTag(), message.getPayload()));
        try {/* w  w w .  j  a va2  s  .c  o m*/
            Thread.sleep(randomInt);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }
    }
}

From source file:Main.java

public static String genRandomSeq(int length) {
    String val = "";

    Random random = new Random();
    for (int i = 0; i < length; i++) {
        // Determine character or digit
        String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";

        if ("char".equalsIgnoreCase(charOrNum)) {
            int choice = random.nextInt(2) % 2 == 0 ? 65 : 97;
            val += (char) (choice + random.nextInt(26));
        } else if ("num".equalsIgnoreCase(charOrNum)) {
            val += String.valueOf(random.nextInt(10));
        }/*from   www. j a v  a  2s. c  om*/
    }

    return val;
}

From source file:Main.java

public static long getRandomLong4() {
    Random rd = new Random();
    long l2 = 0;//from  www . j a  v  a 2 s .  c o  m
    for (int i = 1; i < 100; i++) {
        long l1 = (int) (Math.random() * 9000 + 1000);
        l2 = rd.nextInt(9000) + 1000;
    }
    return l2;
}

From source file:Main.java

/**
 * Generates an array of random colors given the number of colors to create.
 * @param numOfColors, the number of colors to create.
 * @return an array of the random colors.
 *///from   w  w  w .j  a  v a  2s  .c  om
public static int[] getRandomColors(int numOfColors) {
    Random random = new Random();
    int colors[] = new int[numOfColors];
    for (int i = 0; i < numOfColors; i++) {
        int r = random.nextInt(256);
        int g = random.nextInt(256);
        int b = random.nextInt(256);

        if ((r + g + b) > 450) {
            r = 110;
            b = 110;
            g = 110;
        }
        colors[i] = Color.rgb(r, g, b);
    }
    return colors;
}

From source file:Main.java

protected static String generateRandomString(int demoLength) {
    String base = "abcdefghijklmnopqrstuvwxyz";
    Random random = new Random();
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < demoLength; i++) {
        int number = random.nextInt(base.length());
        sb.append(base.charAt(number));/* w w  w  .j a  v  a2s . com*/
    }
    return sb.toString();
}

From source file:org.sharetask.utility.SecurityUtil.java

/**
 * Generate password from alpha numerics characters in total length 8 characters. 
 * @return//from w  w w  .  j  av  a 2  s .  c o  m
 */
public static String generatePassword() {
    final char[] chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();
    final StringBuilder sb = new StringBuilder();
    final Random random = new Random();

    for (int i = 0; i < PASSWORD_LENGT; i++) {
        final char c = chars[random.nextInt(chars.length)];
        sb.append(c);
    }
    return sb.toString();
}

From source file:com.mmj.app.common.util.SerialNumGenerator.java

public static String RandomNum(int length) {
    String str = "0123456789";
    Random random = new Random();
    StringBuffer buf = new StringBuffer();
    for (int i = 0; i < length; i++) {
        int num = random.nextInt(10);
        buf.append(str.charAt(num));//from  w ww .j av  a2  s  .  c o m
    }
    return buf.toString();
}