Java Collection Random Element peekRandom(Collection collection, Random rnd)

Description

peek Random

License

Apache License

Declaration

public static <K> K peekRandom(Collection<K> collection, Random rnd) 

Method Source Code

//package com.java2s;
/*/*from w w  w.  j  ava2 s .  com*/
 * Copyright 2009 Thomas Bocek
 * 
 * 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.ArrayList;

import java.util.Collection;

import java.util.List;

import java.util.Random;

public class Main {
    public static <K> K peekRandom(Collection<K> collection, Random rnd) {
        int size = collection.size();
        if (size == 0) {
            return null;
        }
        int index = rnd.nextInt(size);
        List<K> values = new ArrayList<K>(collection);
        return values.get(index);
    }
}

Related

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2. getRandom(Collection collection)
3. getRandomNumber(Collection collection, int number)
4. nextItem(Collection items, Random random)
5. oneOf(Collection array)
6. pickOneRandomly(Collection from)
7. pollRandom(Collection collection, Random rnd)
8. random(Collection collection)
9. random(Collection coll)