Java Collection to List toList(Collection collection)

Description

to List

License

Open Source License

Declaration

public static <E> List<E> toList(Collection<E> collection) 

Method Source Code

//package com.java2s;
/*//from w ww .ja v a  2s.  co  m
 * MiscUtils.java
 *
 * Copyright (c) 1998 - 2006 BusinessTechnology, Ltd.
 * All rights reserved
 *
 * This program is the proprietary and confidential information
 * of BusinessTechnology, Ltd. and may be used and disclosed only
 * as authorized in a license agreement authorizing and
 * controlling such use and disclosure
 *
 * Millennium ERP system.
 *
 */

import java.util.ArrayList;

import java.util.Collection;

import java.util.List;

public class Main {
    /**
     * Create a list from passed objX parameters
     *
     * @return The resulting List
     */
    public static <T> List<T> toList(T obj1) {
        List<T> list = new ArrayList<T>(1);

        list.add(obj1);
        return list;
    }

    /**
     * Create a list from passed objX parameters
     *
     * @return The resulting List
     */
    public static <E> List<E> toList(E obj1, E obj2) {
        List<E> list = new ArrayList<E>(2);

        list.add(obj1);
        list.add(obj2);
        return list;
    }

    /**
     * Create a list from passed objX parameters
     *
     * @return The resulting List
     */
    public static <E> List<E> toList(E obj1, E obj2, E obj3) {
        List<E> list = new ArrayList<E>(3);

        list.add(obj1);
        list.add(obj2);
        list.add(obj3);
        return list;
    }

    /**
     * Create a list from passed objX parameters
     *
     * @return The resulting List
     */
    public static <E> List<E> toList(E obj1, E obj2, E obj3, E obj4) {
        List<E> list = new ArrayList<E>(4);

        list.add(obj1);
        list.add(obj2);
        list.add(obj3);
        list.add(obj4);
        return list;
    }

    /**
     * Create a list from passed objX parameters
     *
     * @return The resulting List
     */
    public static <E> List<E> toList(E obj1, E obj2, E obj3, E obj4, E obj5) {
        List<E> list = new ArrayList<E>(5);

        list.add(obj1);
        list.add(obj2);
        list.add(obj3);
        list.add(obj4);
        list.add(obj5);
        return list;
    }

    /**
     * Create a list from passed objX parameters
     *
     * @return The resulting List
     */
    public static <E> List<E> toList(E obj1, E obj2, E obj3, E obj4, E obj5, E obj6) {
        List<E> list = new ArrayList<E>(6);

        list.add(obj1);
        list.add(obj2);
        list.add(obj3);
        list.add(obj4);
        list.add(obj5);
        list.add(obj6);
        return list;
    }

    public static <E> List<E> toList(Collection<E> collection) {
        if (collection == null)
            return null;
        if (collection instanceof List) {
            return (List<E>) collection;
        } else {
            return new ArrayList<E>(collection);
        }
    }
}

Related

1. newList(final Collection objects)
2. toList(Collection addresses, char separator)
3. toList(Collection collection)
4. toList(Collection collection)
5. toList(Collection c)
6. toList(Collection lines)
7. toList(Collection c)
8. toList(Collection c)
9. toList(Collection collection)