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:MainClass.java

public static void main(String args[]) {
    Random randomNumbers = new Random(); // random number generator

    int frequency1 = 0; // count of 1s rolled
    int frequency2 = 0; // count of 2s rolled
    int frequency3 = 0; // count of 3s rolled
    int frequency4 = 0; // count of 4s rolled
    int frequency5 = 0; // count of 5s rolled
    int frequency6 = 0; // count of 6s rolled

    int face; // stores most recently rolled value

    // summarize results of 6000 rolls of a die
    for (int roll = 1; roll <= 6000; roll++) {
        face = 1 + randomNumbers.nextInt(6); // number from 1 to 6

        // determine roll value 1-6 and increment appropriate counter
        switch (face) {
        case 1:/*from www.j  av  a 2s. c o m*/
            ++frequency1; // increment the 1s counter
            break;
        case 2:
            ++frequency2; // increment the 2s counter
            break;
        case 3:
            ++frequency3; // increment the 3s counter
            break;
        case 4:
            ++frequency4; // increment the 4s counter
            break;
        case 5:
            ++frequency5; // increment the 5s counter
            break;
        case 6:
            ++frequency6; // increment the 6s counter
            break; // optional at end of switch
        }
    }

    System.out.println("Face\tFrequency"); // output headers
    System.out.printf("1\t%d\n2\t%d\n3\t%d\n4\t%d\n5\t%d\n6\t%d\n", frequency1, frequency2, frequency3,
            frequency4, frequency5, frequency6);
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    int bitLength = 512; // 512 bits
    Random rnd = new Random();
    System.out.println("BitLength : " + bitLength);
    BigInteger mod = new BigInteger(bitLength, rnd);

}

From source file:Main.java

public static void main(String[] args) {
    DoubleStream i = DoubleStream.generate(new Random()::nextDouble);
    Stream<Double> o = i.boxed();

    o.limit(10).forEach(System.out::println);
}

From source file:Main.java

public static void main(String[] args) {

    int bitLength = 3;

    // create a random object
    Random rnd = new Random();

    BigInteger bi = BigInteger.probablePrime(bitLength, rnd);

    System.out.println(bi);/* w  w  w .  j  a  v a  2s. c o m*/
}

From source file:Main.java

public static void main(String[] args) {
    int[] anArray = new int[1000];
    Random generator = new Random();
    for (int i = 0; i < 1000; i++) {
        anArray[i] = (generator.nextInt(1000) + 1);
    }//from   w  w  w .  j  a v a2s .  c  om
    Date before = new Date();
    Arrays.sort(anArray);
    Date after = new Date();
    System.out.println("milli seconds" + (after.getTime() - before.getTime()));
}

From source file:Main.java

public static void main(String args[]) {
    anArray = new double[10];
    Random rand = new Random();
    for (int i = 0; i < 10; i++) {
        anArray[i] = rand.nextInt();/*from ww  w  .jav  a  2 s . c o  m*/
    }
    System.out.println(Arrays.toString(anArray));
}

From source file:Main.java

public static void main(final String[] args) throws Exception {
    Random random = new Random();
    Set<Integer> intSet = new HashSet<>();
    while (intSet.size() < 6) {
        intSet.add(random.nextInt(49) + 1);
    }//  w  ww.ja va2s . c  o  m
    Integer[] ints = intSet.toArray(new Integer[intSet.size()]);
    System.out.println(Arrays.toString(ints));
}

From source file:Main.java

public static void main(String[] args) {
    Random random = new Random();
    Set<Integer> set = new HashSet<Integer>();
    while (set.size() < 5) {
        set.add(random.nextInt());/*from  w w  w .  ja v  a2  s.  c  o m*/
    }
    List<Integer> result = new ArrayList<Integer>(set);
    System.out.println(result);
}

From source file:Main.java

public static void main(String[] args) {
    char array[][] = new char[5][5];
    Random rnd = new Random();
    for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 5; j++) {
            int x = rnd.nextInt(5); // 0 to 4
            switch (x) {
            case 0: {
                array[i][j] = 'a';
                break;
            }//from   w w w  . j  ava  2  s .c o m
            case 1: {
                array[i][j] = 'b';
                break;
            }
            case 2: {
                array[i][j] = 'c';
                break;
            }
            case 3: {
                array[i][j] = 'd';
                break;
            }
            case 4: {
                array[i][j] = 'e';
                break;
            }
            }
        }
    }
    System.out.println(Arrays.deepToString(array));
}

From source file:Main.java

public static void main(String[] args) {
    Set<Integer> intSet = new LinkedHashSet<Integer>();
    Random r = new Random();
    while (intSet.size() <= 6) {
        intSet.add(r.nextInt(49));//from w w  w.jav a 2s  .  co  m
    }
    System.out.println(intSet);
}