Convert a List into an Object array with null check.

Description

Demo Code

/*/*from  w w  w  .  j  a  v a2 s  . c  om*/
    Copyright 1996-2008 Ariba, Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at
        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.

    $Id: //ariba/platform/util/core/ariba/util/core/ArrayUtil.java#9 $
 */
//package com.java2s;

import java.util.List;

public class Main {
    public static void main(String[] argv) throws Exception {
        System.out.println(java.util.Arrays.toString(array()));
    }

    /**
        Convert a List into an Object array with null check.
                    
        @param vector a List to pull the contents from

        @return a new Object array containing all elements of
        <b>vector</b>, or a new empty Object array if <b>vector</b> was
        <b>null</b>
        @aribaapi documented
     */
    public static Object[] array(List vector) {
        if (vector == null) {
            return new Object[0];
        }
        return vector.toArray();
    }

    /**
        Helper function to create a new empty Object array

        @return a new empty Object array
        @aribaapi documented
     */
    public static Object[] array() {
        return new Object[] {};
    }

    /**
        Helper function to create a new Object array containing one
        Object.

        @param a the first Object to add to the List

        @return a new Object array containing the specified object
        @aribaapi documented
     */
    public static Object[] array(Object a) {
        return new Object[] { a };
    }

    /**
        Helper function to create a new Object array containing two
        Objects.

        @param a the first Object to add to the List
        @param b the second Object to add to the List

        @return a new Object array containing the specified objects
        @aribaapi documented
     */
    public static Object[] array(Object a, Object b) {
        return new Object[] { a, b };
    }

    /**
        Helper function to create a new Object array containing three
        Objects.

        @param a the first Object to add to the List
        @param b the second Object to add to the List
        @param c the third Object to add to the List

        @return a new Object array containing the specified objects
        @aribaapi documented
     */
    public static Object[] array(Object a, Object b, Object c) {
        return new Object[] { a, b, c };
    }

    /**
        Helper function to create a new Object array containing four
        Objects.

        @param a the first Object to add to the List
        @param b the second Object to add to the List
        @param c the third Object to add to the List
        @param d the fourth Object to add to the List

        @return a new Object array containing the specified objects
        @aribaapi documented
     */
    public static Object[] array(Object a, Object b, Object c, Object d) {
        return new Object[] { a, b, c, d };
    }

    /**
        Helper function to create a new Object array containing five
        Objects.

        @param a the first Object to add to the List
        @param b the second Object to add to the List
        @param c the third Object to add to the List
        @param d the fourth Object to add to the List
        @param e the fifth Object to add to the List

        @return a new Object array containing the specified objects
        @aribaapi documented
     */
    public static Object[] array(Object a, Object b, Object c, Object d,
            Object e) {
        return new Object[] { a, b, c, d, e };
    }

    /**
        Helper function to create a new Object array containing six
        Objects.

        @param a the first Object to add to the List
        @param b the second Object to add to the List
        @param c the third Object to add to the List
        @param d the fourth Object to add to the List
        @param e the fifth Object to add to the List
        @param f the sixth Object to add to the List

        @return a new Object array containing the specified objects
        @aribaapi documented
     */
    public static Object[] array(Object a, Object b, Object c, Object d,
            Object e, Object f) {
        return new Object[] { a, b, c, d, e, f };
    }

    /**
        Helper function to create a new Object array containing seven
        Objects.

        @param a the first Object to add to the List
        @param b the second Object to add to the List
        @param c the third Object to add to the List
        @param d the fourth Object to add to the List
        @param e the fifth Object to add to the List
        @param f the sixth Object to add to the List
        @param g the seventh Object to add to the List

        @return a new Object array containing the specified objects
        @aribaapi documented
     */
    public static Object[] array(Object a, Object b, Object c, Object d,
            Object e, Object f, Object g) {
        return new Object[] { a, b, c, d, e, f, g };
    }

    /**
        Helper function to create a new Object array containing eight
        Objects.

        @param a the first Object to add to the List
        @param b the second Object to add to the List
        @param c the third Object to add to the List
        @param d the fourth Object to add to the List
        @param e the fifth Object to add to the List
        @param f the sixth Object to add to the List
        @param g the seventh Object to add to the List
        @param h the eighth Object to add to the List

        @return a new Object array containing the specified objects
        @aribaapi documented
     */
    public static Object[] array(Object a, Object b, Object c, Object d,
            Object e, Object f, Object g, Object h) {
        return new Object[] { a, b, c, d, e, f, g, h };
    }
}
Convert a List into an Object array with null check. - Java Collection Framework

Description

Demo Code

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