Java List Remove Duplicate removeDuplicates(List list)

Description

remove Duplicates

License

Open Source License

Declaration

public static void removeDuplicates(List list) 

Method Source Code

//package com.java2s;

import java.util.Collection;
import java.util.Collections;

import java.util.HashSet;

import java.util.Iterator;
import java.util.List;

import java.util.Set;

public class Main {

    public static void removeDuplicates(List list) {
        if ((list != null) && !list.isEmpty()) {
            Set set = new HashSet(list.size());

            for (Iterator iter = list.iterator(); iter.hasNext();) {
                Object element = iter.next();

                if (set.contains(element)) {
                    iter.remove();//from  w w  w  . j a v  a 2 s  .  co  m
                } else {
                    set.add(element);
                }
            }
        }
    }

    /**
     * Returns 0 if the specified collection is null or the collection size
     * if not null.
     *
     * @param c the collection to size
     * @return the size of the collection
     */
    public static int size(Collection c) {
        return (c == null) ? 0 : c.size();
    }

    /**
     * Returns an iterator on a collection even null.
     * @param collection Collection
     * @return Iterator
     */
    public static Iterator iterator(Collection collection) {
        if (collection == null) {
            return Collections.EMPTY_LIST.iterator();
        } else {
            return collection.iterator();
        }
    }
}

Related

1. removeDup(List lst)
2. removeDuplicate(Collection entityList)
3. removeDuplicate(List uidList)
4. removeDuplicate(List dest, List src)
5. removeDuplicates(int[] list)
6. removeDuplicates(List listofthings)
7. removeDuplicates(List commonVars)
8. removeDuplicates(List l)
9. removeDuplicates(List collection)