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:Clases.Encriptar.java

public static String getCadenaAleatoria(int longitud) {//microtime
    String cadenaAleatoria = "";
    long milis = new java.util.GregorianCalendar().getTimeInMillis();
    Random r = new Random(milis);
    int i = 0;/*from   w  w  w .  j  a va  2s .c  o m*/
    while (i < longitud) {
        char c = (char) r.nextInt(255);
        if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c == '$')
                || (c == '_')) {
            cadenaAleatoria += c;
            i++;
        }
    }
    return cadenaAleatoria;
}

From source file:Main.java

public static String randomString(int length) {
    String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    Random random = new Random();
    StringBuffer buf = new StringBuffer();
    for (int i = 0; i < length; i++) {
        int num = random.nextInt(62);
        buf.append(str.charAt(num));/*from  w w w.  ja v  a2  s  .co m*/
    }
    return buf.toString();
}

From source file:Main.java

/**
 * Generate array of Number//from   w  w  w .ja v a2  s.co  m
 * @param length int
 * @return String
 */
public static String generateNumber(int length) {

    String numbers = "0123456789";
    String randomNumber = "";
    Random random = new Random();
    for (int i = 0; i < length; i++) {

        randomNumber = randomNumber + numbers.charAt(random.nextInt(numbers.length()));

    }

    return randomNumber;
}

From source file:cz.cuni.mff.d3s.spl.utils.StatisticsUtils.java

/** Bootstrap from already known values.
 * /*  w  ww .j  a v a 2  s .c om*/
 * <p>
 * The bootstrapping procedure is simple as we randomly select values from
 * the source array to store in the destination one.
 * Obviously, the individual values can be repeated in the bootstrapped
 * array.
 * 
 * @param source Array with original values to bootstrap from.
 * @param dest Array where to store the bootstrapped values.
 * @param rnd Random number generator to use.
 */
public static void bootstrap(double[] source, double dest[], Random rnd) {
    for (int i = 0; i < dest.length; i++) {
        dest[i] = source[rnd.nextInt(source.length)];
    }
}

From source file:Main.java

public static String getRandomString(int length) {
    String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    Random random = new Random();
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < length; i++) {
        int number = random.nextInt(62);
        sb.append(str.charAt(number));/*from   ww  w  .  j  a v  a 2s. c o  m*/
    }
    return sb.toString();
}

From source file:com.splunk.shuttl.testutil.TUtilsMockito.java

/**
 * @return a fairly random HttpStatus//from  w  ww  . j a v a2s  .  c o  m
 */
private static Integer getAnyHttpStatus() {
    Integer[] someHttpStatuses = new Integer[] { HttpStatus.SC_ACCEPTED, HttpStatus.SC_GATEWAY_TIMEOUT,
            HttpStatus.SC_OK, HttpStatus.SC_INTERNAL_SERVER_ERROR };
    Random rand = new Random();
    return someHttpStatuses[rand.nextInt(someHttpStatuses.length)];
}

From source file:Main.java

/**
 * Generate array of alphabet/*from  w ww . j a  v a 2s . c o  m*/
 * @return String
 */
public static String generateAlphabet(int length) {

    String alphabet = "abcdefghijklmnopqrstuvwxyz";
    String randomAlphabet = "";
    Random random = new Random();
    for (int i = 0; i < length; i++) {

        randomAlphabet = randomAlphabet + alphabet.charAt(random.nextInt(alphabet.length()));

    }

    return randomAlphabet;
}

From source file:Main.java

public static String getRandomString(int length) {
    String str = "abcdefghigklmnopkrstuvwxyzABCDEFGHIGKLMNOPQRSTUVWXYZ0123456789";
    Random random = new Random();
    StringBuffer sf = new StringBuffer();
    for (int i = 0; i < length; i++) {
        int number = random.nextInt(62);//0~61
        sf.append(str.charAt(number));/*  w  ww. j  a va  2s  . c  o  m*/

    }
    return sf.toString();
}

From source file:Main.java

public static String RandomNIntforStr(int digits) {
    Random random = new Random();
    StringBuilder sb = new StringBuilder(digits);
    for (int i = 0; i < digits; i++) {
        sb.append(random.nextInt(10));
        //         sb.append((char)('0' + rnd.nextInt(10)));  
    }//  w  w w  .  j  a  v  a 2s .  c om
    return sb.toString();
}

From source file:Main.java

/**
 * Generate a unicast MAC address./*  w ww .j  av a  2s.c  o  m*/
 * A unicast MAC address is the one with an even second hex.
 * i.e. x[0,2,4,6,8,A,C,E]:xx:xx:xx:xx:xx
 * 
 * @return Unicast MAC address
 */
public static String generateRandomMACAddress() {
    Random r = new Random();
    StringBuffer sb = new StringBuffer();
    sb.append(Integer.toHexString(r.nextInt(16)));
    int i = r.nextInt(16);
    while (i % 2 != 0)
        i = r.nextInt(16);
    sb.append(Integer.toHexString(i));
    while (sb.length() <= 12)
        sb.append(Integer.toHexString(r.nextInt()));
    String address = prepareMACAddress(sb.subSequence(0, 12).toString());
    if (address.equals("ff:ff:ff:ff:ff:ff"))
        return generateRandomMACAddress();
    return address;
}