Java Random Element randomElement(final Set set)

Description

random Element

License

Apache License

Parameter

Parameter	Description
runningJobs	a parameter
v	a parameter

Declaration

public static <E> E randomElement(final Set<E> set) 

Method Source Code

//package com.java2s;
/**//w w  w .  j av a 2  s .c  o m
 * Copyright (C) [2013] [The FURTHeR Project]
 *
 * 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;
import java.util.Set;

public class Main {
    /**
     * Generates random data.
     */
    private static final Random RANDOM_GENERATOR = new Random();

    /**
     * @param runningJobs
     * @param v
     */
    public static <E> E randomElement(final Set<E> set) {
        final int size = set.size();
        final int index = RANDOM_GENERATOR.nextInt(size);
        int i = 0;
        for (final E element : set) {
            if (i == index) {
                return element;
            }
            i++;
        }
        throw new IllegalStateException("Random index outside set size range: index " + index + " size " + size);
    }
}

Related

1. randomEle(List list)
2. randomElem(Random rand, Set partitions)
3. randomElement(Collection coll)
4. randomElement(E[] array)
5. randomElement(int[] anArray)
6. randomElement(List list)
7. randomElement(T... values)
8. randomElement(T[] array)