Java ThreadLocalRandom random(T[] array)

Description

Pseudo-randomly retrieves a element from array .

License

Open Source License

Parameter

Parameter	Description
array	The array to retrieve an element from.

Return

The element retrieved from the array.

Declaration

public static <T> T random(T[] array) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.List;

import java.util.concurrent.ThreadLocalRandom;

public class Main {
    /**/*from   w  w w.j  a  va2s  .  c  om*/
     * Pseudo-randomly retrieves a element from {@code array}.
     *
     * @param array The array to retrieve an element from.
     * @return The element retrieved from the array.
     */
    public static <T> T random(T[] array) {
        return array[(int) (ThreadLocalRandom.current().nextDouble() * array.length)];
    }

    /**
     * Pseudo-randomly retrieves an {@code int} from this {@code array}.
     *
     * @param array The array to retrieve an {@code int} from.
     * @return The {@code int} retrieved from the array.
     */
    public static int random(int[] array) {
        return array[(int) (ThreadLocalRandom.current().nextDouble() * array.length)];
    }

    /**
     * Pseudo-randomly retrieves an {@code long} from this {@code array}.
     *
     * @param array The array to retrieve an {@code long} from.
     * @return The {@code long} retrieved from the array.
     */
    public static long random(long[] array) {
        return array[(int) (ThreadLocalRandom.current().nextDouble() * array.length)];
    }

    /**
     * Pseudo-randomly retrieves an {@code double} from this {@code array}.
     *
     * @param array The array to retrieve an {@code double} from.
     * @return The {@code double} retrieved from the array.
     */
    public static double random(double[] array) {
        return array[(int) (ThreadLocalRandom.current().nextDouble() * array.length)];
    }

    /**
     * Pseudo-randomly retrieves an {@code short} from this {@code array}.
     *
     * @param array The array to retrieve an {@code short} from.
     * @return The {@code short} retrieved from the array.
     */
    public static short random(short[] array) {
        return array[(int) (ThreadLocalRandom.current().nextDouble() * array.length)];
    }

    /**
     * Pseudo-randomly retrieves an {@code byte} from this {@code array}.
     *
     * @param array The array to retrieve an {@code byte} from.
     * @return The {@code byte} retrieved from the array.
     */
    public static byte random(byte[] array) {
        return array[(int) (ThreadLocalRandom.current().nextDouble() * array.length)];
    }

    /**
     * Pseudo-randomly retrieves an {@code float} from this {@code array}.
     *
     * @param array The array to retrieve an {@code float} from.
     * @return The {@code float} retrieved from the array.
     */
    public static float random(float[] array) {
        return array[(int) (ThreadLocalRandom.current().nextDouble() * array.length)];
    }

    /**
     * Pseudo-randomly retrieves an {@code boolean} from this {@code array}.
     *
     * @param array The array to retrieve an {@code boolean} from.
     * @return The {@code boolean} retrieved from the array.
     */
    public static boolean random(boolean[] array) {
        return array[(int) (ThreadLocalRandom.current().nextDouble() * array.length)];
    }

    /**
     * Pseudo-randomly retrieves an {@code char} from this {@code array}.
     *
     * @param array The array to retrieve an {@code char} from.
     * @return The {@code char} retrieved from the array.
     */
    public static char random(char[] array) {
        return array[(int) (ThreadLocalRandom.current().nextDouble() * array.length)];
    }

    /**
     * Pseudo-randomly retrieves a element from {@code list}.
     *
     * @param list The list to retrieve an element from.
     * @return The element retrieved from the list.
     */
    public static <T> T random(List<T> list) {
        return list.get((int) (ThreadLocalRandom.current().nextDouble() * list.size()));
    }
}

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3. random(char lower, char upper, int length)
4. random(double min, double max)
5. random(int min, int max)
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