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 long nextLong(int lower, int upper) {
    Random ra = new Random();
    int n = lower + ra.nextInt(upper - lower);
    long m = ra.nextLong();
    return n + m;
}

From source file:Main.java

public static char RandomCharFromStr(String str) {
    Random random = new Random();
    int index = random.nextInt(str.length());
    return str.charAt(index);
}

From source file:Main.java

public static float nextFloat(int lower, int upper) {
    Random ra = new Random();
    int n = lower + ra.nextInt(upper - lower);
    float m = ra.nextFloat();
    return n + m;
}

From source file:Main.java

public static int[] shuffleArray(int[] ar) {
    Random rnd = new Random();
    for (int i = ar.length - 1; i > 0; i--) {
        int index = rnd.nextInt(i + 1);
        // Simple swap
        int a = ar[index];
        ar[index] = ar[i];//  ww  w.  j  a v  a2s. co  m
        ar[i] = a;
    }

    return ar;
}

From source file:Main.java

public static double nextDouble(int lower, int upper) {
    Random ra = new Random();
    int n = lower + ra.nextInt(upper - lower);
    double m = ra.nextDouble();
    return n + m;
}

From source file:Main.java

public static String getRandomUserId(int i) {
    Random random = new Random();
    StringBuilder stringbuilder = new StringBuilder(i);
    int j = 0;//from w ww .  ja  v a  2 s.  co  m
    do {
        if (j >= i)
            return stringbuilder.toString();
        stringbuilder.append((char) (48 + random.nextInt(10)));
        j++;
    } while (true);
}

From source file:Main.java

public static int radrom(int max, int position) {
    Random random = new Random();
    int randomNum = random.nextInt(max);
    if (position == randomNum) {
        randomNum = radrom(max, position);
    }//from  w w  w . ja v  a 2s. c o m
    return randomNum;
}

From source file:Main.java

public static int generateRandom(int min, int max) {
    Random random = new Random();
    int randomInt = random.nextInt((max - min) + 1) + min;
    if (randomInt > max) {
        randomInt -= min;//from  w w  w.j a  v  a 2 s  .  co m
    }
    return randomInt;
}

From source file:Main.java

public static int[] shuffle(int[] numbers) {
    for (int i = 0; i < numbers.length; i++) {
        int swap = new Random().nextInt(i + 1);
        int temp = numbers[swap];
        numbers[swap] = numbers[i];/*w ww. jav  a 2s .c  om*/
        numbers[i] = temp;
    }
    return numbers;
}

From source file:Main.java

public static String RandomStrFromArray(String[] array) {
    Random random = new Random();
    int index = random.nextInt(array.length);
    return array[index];
}