Java 将列表转换为带有空检查的对象数组。
将列表转换为带有空检查的对象数组。
实例源码：
源代码：
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/*3
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Copyright 1996-2008 Ariba, Inc.5
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Licensed under the Apache License, Version 2.0 (the "License");8
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you may not use this file except in compliance with the License.10
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You may obtain a copy of the License at12
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http://www.apache.org/licenses/LICENSE-2.014
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Unless required by applicable law or agreed to in writing, software17
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distributed under the License is distributed on an "AS IS" BASIS,19
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.21
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See the License for the specific language governing permissions and23
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limitations under the License.25
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$Id: //ariba/platform/util/core/ariba/util/core/ArrayUtil.java#9 $28
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*/30
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//package com.nowjava;/** from n o w j a v a . c o m - 时 代 Java**/32
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import java.util.List;35
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public class Main {38
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public static void main(String[] argv) throws Exception {40
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System.out.println(java.util.Arrays.toString(array()));42
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}44
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/**47
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Convert a List into an Object array with null check.49
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@param vector a List to pull the contents from53
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@return a new Object array containing all elements of56
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<b>vector</b>, or a new empty Object array if <b>vector</b> was58
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<b>null</b>60
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@aribaapi documented62
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*/64
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public static Object[] array(List vector) {66
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if (vector == null) {68
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return new Object[0];70
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}72
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return vector.toArray();74
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}76
/** 来 自 NowJava.com - 时代Java**/77
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/**79
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Helper function to create a new empty Object array81
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@return a new empty Object array84
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@aribaapi documented86
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*/88
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public static Object[] array() {90
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return new Object[] {};92
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}94
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/**97
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Helper function to create a new Object array containing one99
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Object.101
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@param a the first Object to add to the List104
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@return a new Object array containing the specified object107
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@aribaapi documented109
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*/111
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public static Object[] array(Object a) {113
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return new Object[] { a };115
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}117
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/**120
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Helper function to create a new Object array containing two122
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Objects.124
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@param a the first Object to add to the List127
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@param b the second Object to add to the List129
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@return a new Object array containing the specified objects132
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@aribaapi documented134
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*/136
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public static Object[] array(Object a, Object b) {138
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return new Object[] { a, b };140
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}142
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/**145
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Helper function to create a new Object array containing three147
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Objects.149
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@param a the first Object to add to the List152
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@param b the second Object to add to the List154
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@param c the third Object to add to the List156
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@return a new Object array containing the specified objects159
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@aribaapi documented161
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*/163
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public static Object[] array(Object a, Object b, Object c) {165
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return new Object[] { a, b, c };167
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}169
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/**172
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Helper function to create a new Object array containing four174
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Objects.176
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@param a the first Object to add to the List179
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@param b the second Object to add to the List181
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@param c the third Object to add to the List183
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@param d the fourth Object to add to the List185
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@return a new Object array containing the specified objects188
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@aribaapi documented190
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*/192
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public static Object[] array(Object a, Object b, Object c, Object d) {194
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return new Object[] { a, b, c, d };196
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}198
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/**201
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Helper function to create a new Object array containing five203
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Objects.205
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@param a the first Object to add to the List208
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@param b the second Object to add to the List210
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@param c the third Object to add to the List212
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@param d the fourth Object to add to the List214
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@param e the fifth Object to add to the List216
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@return a new Object array containing the specified objects219
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@aribaapi documented221
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*/223
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public static Object[] array(Object a, Object b, Object c, Object d,225
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Object e) {227
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return new Object[] { a, b, c, d, e };229
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}231
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/**234
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Helper function to create a new Object array containing six236
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Objects.238
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@param a the first Object to add to the List241
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@param b the second Object to add to the List243
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@param c the third Object to add to the List245
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@param d the fourth Object to add to the List247
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@param e the fifth Object to add to the List249
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@param f the sixth Object to add to the List251
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@return a new Object array containing the specified objects254
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@aribaapi documented256
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*/258
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public static Object[] array(Object a, Object b, Object c, Object d,260
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Object e, Object f) {262
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return new Object[] { a, b, c, d, e, f };264
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}266
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/**269
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Helper function to create a new Object array containing seven271
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Objects.273
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@param a the first Object to add to the List276
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@param b the second Object to add to the List278
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@param c the third Object to add to the List280
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@param d the fourth Object to add to the List282
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@param e the fifth Object to add to the List284
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@param f the sixth Object to add to the List286
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@param g the seventh Object to add to the List288
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@return a new Object array containing the specified objects291
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@aribaapi documented293
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*/295
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