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:Main.java

public static void main(String args[]) {
    int a = 0, b = 0, c = 0;
    Random r = new Random();
    for (int i = 0; i < 32000; i++) {
        try {//  ww w. j  a  v  a 2  s  . co  m
            b = r.nextInt();
            c = r.nextInt();
            a = 12345 / (b / c);
        } catch (ArithmeticException e) {
            System.out.println("Exception: " + e);
            a = 0; // set a to zero and continue
        }
        System.out.println("a: " + a);
    }
}

From source file:Main.java

public static void main(String args[]) {
    int a = 0, b = 0, c = 0;
    Random r = new Random();
    for (int i = 0; i < 32000; i++) {
        try {/*from  www .j  ava  2s .  c o m*/
            b = r.nextInt();
            c = r.nextInt();
            a = 12345 / (b / c);
        } catch (ArithmeticException e) {
            System.out.println("Division by zero.");
            a = 0; // set a to zero and continue
        }
        System.out.println("a: " + a);
    }
}

From source file:Main.java

public static void main(String... a) {
    int n = 16;// w w w .j a  va 2  s.com

    Random r = new Random();
    byte[] b = new byte[n];
    r.nextBytes(b);
    BigInteger i = new BigInteger(b);

    System.out.println(i);
}

From source file:Main.java

public static void main(String[] args) {

    String[] arr = { "A", "B", "C", "D" };
    Random random = new Random();

    int select = random.nextInt(arr.length);

    System.out.println("Random String selected: " + arr[select]);
}

From source file:MainClass.java

public static void main(String args[]) {
    Random rand = new Random();
    System.out.println(rand.nextDouble());
}

From source file:Main.java

public static void main(String[] args) {
    for (int loop = 1; loop <= 1000; loop++) {
        int random1 = new Random().nextInt(100);
        int random2 = new Random().nextInt(100);
        if (random1 == random2) {
            System.out.println("Duplicate: " + random1);
        }//from  www  .  ja  v  a 2s .  c o m
    }
}

From source file:Main.java

public static void main(String[] args) {
    Random r = new Random();

    // generate some random boolean values
    boolean[] booleans = new boolean[10];
    for (int i = 0; i < booleans.length; i++) {
        booleans[i] = r.nextBoolean();/*w w  w.  ja  v a  2  s.c  o  m*/
    }

    for (boolean b : booleans) {
        System.out.print(b + ", ");
    }

    // generate a uniformly distributed int random numbers
    int[] integers = new int[10];
    for (int i = 0; i < integers.length; i++) {
        integers[i] = r.nextInt();
    }

    for (int i : integers) {
        System.out.print(i + ", ");
    }

    // generate a uniformly distributed float random numbers
    float[] floats = new float[10];
    for (int i = 0; i < floats.length; i++) {
        floats[i] = r.nextFloat();
    }

    for (float f : floats) {
        System.out.print(f + ", ");
    }

    // generate a Gaussian normally distributed random numbers
    double[] gaussians = new double[10];
    for (int i = 0; i < gaussians.length; i++) {
        gaussians[i] = r.nextGaussian();
    }

    for (double d : gaussians) {
        System.out.print(d + ", ");
    }
}

From source file:Main.java

public static void main(String args[]) {
    int rnd;/*w  w w. j  a v a 2 s .  co m*/
    Random rand = new Random();
    int[] nums = new int[50];

    boolean[] check = new boolean[50];

    for (int k = 0; k < 50; k++) {
        rnd = rand.nextInt(50);
        //check if the check array index has been set
        //if set regenerate since it is duplicate 
        while (check[rnd]) {
            rnd = rand.nextInt(50);
        }
        nums[k] = rnd;
        check[rnd] = true;
    }
    System.out.println(Arrays.toString(nums));

}

From source file:Main.java

public static void main(String[] args) {
    int[][] array = new int[2][10];
    Random rand = new Random();
    for (int i = 0; i < 10; i++) {
        array[0][i] = i;/*  w  w w.  j av a2  s  .co  m*/
        array[1][i] = (int) rand.nextInt(3) + 1;
    }

    System.out.println(Arrays.deepToString(array));

}

From source file:Main.java

public static void main(String... args) {
    int[] data = new int[] { 1, 2, 2, 2, 3, 3, 4, 5, 5, 5, 5, 5, 5 };
    System.out.print(data[new Random().nextInt(data.length)]);
}