Java ListIterator Usage clearNulls(Collection col)

Description

clear Nulls

License

Open Source License

Parameter

Parameter	Description
T	a parameter
col	a parameter

Return

a list without null elements

Declaration

public static <T> ArrayList<T> clearNulls(Collection<T> col) 

Method Source Code

//package com.java2s;
/*----------------------------------------------------------------------------
 This file is part of deegree, http://deegree.org/
 Copyright (C) 2001-2009 by://from w  ww .  jav  a  2s  . c  om
 Department of Geography, University of Bonn
 and
 lat/lon GmbH
    
 This library is free software; you can redistribute it and/or modify it under
 the terms of the GNU Lesser General Public License as published by the Free
 Software Foundation; either version 2.1 of the License, or (at your option)
 any later version.
 This library 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 Lesser General Public License for more
 details.
 You should have received a copy of the GNU Lesser General Public License
 along with this library; if not, write to the Free Software Foundation, Inc.,
 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    
 Contact information:
    
 lat/lon GmbH
 Aennchenstr. 19, 53177 Bonn
 Germany
 http://lat-lon.de/
    
 Department of Geography, University of Bonn
 Prof. Dr. Klaus Greve
 Postfach 1147, 53001 Bonn
 Germany
 http://www.geographie.uni-bonn.de/deegree/
    
 e-mail: info@deegree.org
 ----------------------------------------------------------------------------*/

import java.util.ArrayList;

import java.util.Collection;

import java.util.List;
import java.util.ListIterator;

public class Main {
    /**
     * @param <T>
     * @param col
     * @return a list without null elements
     */
    public static <T> ArrayList<T> clearNulls(Collection<T> col) {
        ArrayList<T> list = new ArrayList<T>(col.size());

        for (T t : col) {
            if (t != null) {
                list.add(t);
            }
        }

        return list;
    }

    /**
     * Removed null elements in-place.
     * 
     * @param <T>
     * @param col
     */
    public static <T> void clearNulls(List<T> col) {
        ListIterator<T> iter = col.listIterator();
        while (iter.hasNext()) {
            if (iter.next() == null) {
                iter.remove();
            }
        }
    }
}

Related

1. castIterator(final Iterator iterator)
2. containsUsingListIteratorNext(List list, Integer value)
3. createCommaSeparatedListOfFullTypeNames(ListIterator strIt)
4. differingDigits(final int lhs, final int rhs, final int base)
5. emptyIterator()