Java Random Long nextLong(long n)

Description

Returns random long within the bounds of 0 and n.

License

Apache License

Parameter

Parameter	Description
n	is an upper limit.

Return

random long number.

Declaration

public static long nextLong(long n) 

Method Source Code

//package com.java2s;
/*/* w  w w .  ja v  a 2  s .c o  m*/
 *  Copyright 2014 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.Random;

public class Main {
    private static final Random rand = new Random(42);

    /**
     * Returns random long within the bounds of 0 and n.
     *
     * @param n is an upper limit.
     * @return random long number.
     */
    public static long nextLong(long n) {
        long bits, val;
        do {
            bits = (rand.nextLong() << 1) >>> 1;
            val = bits % n;
        } while (bits - val + (n - 1) < 0L);
        return val;
    }
}

Related

1. getLongSpecialCases()
2. getRandomLong()
3. nextLong()
4. nextLong()
5. nextLong()
6. nextLong(long n)
7. nextLong(long RangeBottom, long rangeTop)
8. nextLong(Random random, final long lower, final long upper)
9. nextLong(Random rng, long n)