Java AtomicLong Accumulator random()

Description

Gets the ThreadLocalRandom instance for the current thread.

License

MIT License

Return

the current thread's

Declaration

public static ThreadLocalRandom random() 

Method Source Code

//package com.java2s;
/*/*from   w ww.  j  av a 2 s. c o m*/
 * This file is part of dzlib, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2014 Oliver Stanley <http://ollie.pw>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.util.concurrent.ThreadLocalRandom;

public class Main {
    /**
     * Gets the {@link ThreadLocalRandom} instance for the current thread. This
     * should be used in concurrent applications. As of Java 7, we should never
     * use <code>Math.random()</code>
     *
     * Below text from http://www.javaspecialists.eu/archive/Issue198.html
     *
     * <p>Math.random() method delegates to a shared mutable instance of Random.
     * Since they use atomics, rather than locking, it is impossible for the
     * compound nextDouble() method to be atomic. Thus it is possible that
     * between calls to next(27) and next(26), other threads call next()</p>
     *
     * <p>If you had thousands of threads calling Math.random() at the same
     * time, your thread could be swapped out for long enough, so that
     * (int) (Math.random() + 1) could return 2.</p>
     *
     * @return the current thread's {@link ThreadLocalRandom}
     */
    public static ThreadLocalRandom random() {
        return ThreadLocalRandom.current();
    }
}

Related

1. calculateMemory()
2. getDefaultSSLProtocol()
3. getEnabledSSLProtocols()
4. getIncrement()
5. min(List list)
6. setEnabledSSLProtocols(final Collection enabledSSLProtocols)
7. signalAll(AtomicBoolean condition)
8. waitForCondition(final AtomicBoolean condition, long timeout)
9. waitForConditionEx(final AtomicBoolean condition, long timeout)