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 void shuffle(final Object[] array) {
    final Random r = new Random();
    final int limit = array.length;
    for (int i = 0; i < limit; ++i) {
        swap(array, i, r.nextInt(limit));
    }//  w w  w  . j a  va2  s . c  o m
}

From source file:Main.java

public static void shuffle(final int[] array) {
    final Random r = new Random();
    final int limit = array.length;
    for (int i = 0; i < limit; ++i) {
        swap(array, i, r.nextInt(limit));
    }//from   w  w w  .  j  a  v a  2  s .com
}

From source file:Main.java

public static List<Integer> randomChoose(int total, int selectedCount) {
    Random random = new Random();
    List<Integer> resultList = new ArrayList<Integer>();
    while (resultList.size() < selectedCount) {
        Integer randomNum = random.nextInt(total) + 1;
        if (!resultList.contains(randomNum)) {
            resultList.add(randomNum);// www.  ja v  a2  s.  c  o m
        }
    }
    return resultList;
}

From source file:Main.java

public static String randomNumericString(int stringLength) {
    Random generator = new Random();
    StringBuilder randomStringBuilder = new StringBuilder();
    for (int i = 0; i < stringLength; i++) {
        randomStringBuilder.append(generator.nextInt(9));
    }// w  w w.  j  ava 2 s . co  m
    return randomStringBuilder.toString();
}

From source file:eu.dasish.annotation.backend.Helpers.java

public static UUID generateUUID() {
    UUID result = UUID.randomUUID();
    char[] chars = result.toString().toCharArray();
    if (chars[0] >= 'a' && chars[0] <= 'z') {
        return result;
    } else {//from  w  w  w  .  j  a  va2 s. c  o  m
        Random r = new Random();
        chars[0] = hexa.charAt(r.nextInt(hexan));
        result = UUID.fromString(new String(chars));
        return result;
    }
}

From source file:Main.java

/**
 * get a fixed-length random string, its a mixture of chars in sourceChar
 *
 * @param sourceChar//from www  . ja  v  a2  s . c o m
 * @param length
 * @return <ul>
 * <li>if sourceChar is null or empty, return null</li>
 * <li>if length less than 0, return null</li>
 * </ul>
 */
public static String getRandom(char[] sourceChar, int length) {
    if (sourceChar == null || sourceChar.length == 0 || length < 0) {
        return null;
    }

    StringBuilder str = new StringBuilder(length);
    Random random = new Random();
    for (int i = 0; i < length; i++) {
        str.append(sourceChar[random.nextInt(sourceChar.length)]);
    }
    return str.toString();
}

From source file:Main.java

public static void shuffle(final Object[] array, final long seed) {
    final Random r = new Random(seed);
    final int limit = array.length;
    for (int i = 0; i < limit; ++i) {
        swap(array, i, r.nextInt(limit));
    }//from  w  ww  . ja va2  s. c  o m
}

From source file:Main.java

/**
 * Generate a random String//from ww w  . j a v  a  2  s .c om
 *
 * @param values The characters list to use in the randomization
 * @param len The number of characters in the output String
 * @return The randomized String
 */
public static String randomString(char[] values, int len) {
    Random rnd = new SecureRandom();
    StringBuilder sb = new StringBuilder(len);
    for (int i = 0; i < len; i++) {
        sb.append(values[rnd.nextInt(values.length)]);
    }
    return sb.toString();
}

From source file:com.g414.dgen.field.Fields.java

/** returns a random integer in the given range */
public static Field<Integer> getIntField(final String name, final int start, final int stop) {
    return new Field<Integer>() {
        private final int range = stop - start;

        @Override//from w  w w. ja v  a2 s  .  c  o m
        public String getName() {
            return name;
        }

        @Override
        public Integer getValue(String entityId, Map<String, Object> entitySoFar, Random random) {
            int next = random.nextInt(range);

            return next + start;
        }
    };
}

From source file:Main.java

public static List<String> generateWidth() {
    List<String> ids = new ArrayList<String>();
    Random mRandom = new Random();
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < 50; i++) {
        sb.delete(0, sb.length());/* w w  w . j a v a2 s .c o  m*/
        int height = mRandom.nextInt(250) + 100;
        sb.append(height);
        ids.add(sb.toString());
    }
    return ids;
}