Java Random Long nextLong(Random rng, long n)

Description

next Long

License

Mozilla Public License

Declaration

public final static long nextLong(Random rng, long n) 

Method Source Code

//package com.java2s;
/*/* w  ww  . j a v a  2 s. c  o  m*/
 * Copyright (c) 2014 mucaho (https://github.com/mucaho).
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

import java.util.Random;

public class Main {
    public final static long nextLong(Random rng, long n) {
        // error checking and 2^x checking removed for simplicity.
        long bits, val;
        do {
            bits = (rng.nextLong() << 1) >>> 1;
            val = bits % n;
        } while (bits - val + (n - 1) < 0L);
        return val;
    }
}

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