Java Random extractRandomObject(Collection c)

Description

extract Random Object

License

Open Source License

Declaration

public static <K> K extractRandomObject(Collection<K> c) 

Method Source Code

//package com.java2s;
/*/*from   ww w. j av  a  2s. c o  m*/
 * WANDORA
 * Knowledge Extraction, Management, and Publishing Application
 * http://wandora.org
 * 
 * Copyright (C) 2004-2016 Wandora Team
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *
 * 
 *
 * GenericVelocityHelper.java
 *
 * Created on 17. joulukuuta 2004, 10:54
 */

import java.util.*;

public class Main {
    public static <K> K extractRandomObject(Collection<K> c) {
        if (c == null || c.size() == 0)
            return null;

        int randomIndex = (int) (Math.random() * c.size());
        Iterator<K> iter = c.iterator();
        K o = iter.next();
        while (iter.hasNext() && randomIndex-- > 0)
            o = iter.next();
        return o;
    }
}

Related

1. createRandomStr(int digit)
2. decimal_random()
3. equalsRandomIterable(List a, List bl)
4. extractRandomVector(Collection c, int newSize)
5. gaussianInt(Random random, int min, int max)
6. generateRandom(byte[] byteArray)
7. generateRandom(int length, int type)