Returns a random long number in the given range [0, n], with both inclusive. - Android java.util

Android examples for java.util:Random Integer

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Description

Returns a random long number in the given range [0, n], with both inclusive.

Demo Code


//package com.java2s;

import java.util.Random;

public class Main {
    /**// w ww .j a v  a2 s  .  c o m
     * Returns a random long number in the given range [0, n], with both inclusive.
     * <br>
     * If negative value is specified, then range is between [n, 0].
     * <br>
     * Internally calls {@link #getRandomLongWithinRange(long, long)}.
     * <br>
     * E.g., 
     * @param max
     * @return
     */
    public static long getRandomLong(long max) {
        long min = 0;
        if (max < 0) {
            long temp = max;
            max = 0;
            min = temp;
        }
        return getRandomLongWithinRange(min, max);
    }

    /**
     * @param min
     * @param max
     * @return
     */
    public static long getRandomLongWithinRange(long min, long max) {
        if (min == max) {
            return max;
        }
        if (max < min) {
            long temp = max;
            max = min;
            min = temp;
        }
        Random r = new Random();
        double randomFactor = r.nextDouble();
        return (long) (min + ((max - min + 1) * randomFactor));
    }
}

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