Java Collection Hash hashCode(Collection collection)

Description

Method hashCode.

License

Open Source License

Parameter

Parameter	Description
collection	Collection<E>

Return

int

Declaration

public static <E> int hashCode(Collection<E> collection) 

Method Source Code

//package com.java2s;
/*//from  w ww  .java 2  s. c  o  m
 * 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/>.
 */

import java.util.Collection;

import java.util.Iterator;

public class Main {
    /**
     * Method hashCode.
     * @param collection Collection<E>
     * @return int
     */
    public static <E> int hashCode(Collection<E> collection) {
        int hashCode = 1;
        Iterator<E> i = collection.iterator();
        while (i.hasNext()) {
            E obj = i.next();
            hashCode = (31 * hashCode) + (obj == null ? 0 : obj.hashCode());
        }
        return hashCode;
    }
}

Related

1. hashCode(Collection c)
2. hashCode(Collection collection)
3. hashCodeDeep(Collection collection)
4. hashCodeUnordered(Collection collection)