Java 创建数组并使用反射设置其元素值
创建数组并使用反射设置其元素值
实例源码：
源代码：
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import java.lang.reflect.Array;3
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import java.lang.reflect.Constructor;5
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import java.lang.reflect.InvocationTargetException;7
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import java.util.regex.Pattern;9
/**10
from11
* nowjava.com 12
**/13
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import java.util.regex.Matcher;15
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import java.util.Arrays;17
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import static java.lang.System.out;19
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public class ArrayCreator {22
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private static String s = "java.math.BigInteger bi[] = { 123, 234, 345 }";24
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private static Pattern p = Pattern26
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.compile("^\\s*(\\S+)\\s*\\w+\\[\\].*\\{\\s*([^}]+)\\s*\\}");28
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public static void main(String args) {31
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Matcher m = p.matcher(s);33
//N o w J a v a . c o m 提供34
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if (m.find()) {36
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String cName = m.group(1);38
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String[] cVals = m.group(2).split("[\\s,]+");40
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int n = cVals.length;42
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try {45
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Class<?> c = Class.forName(cName);47
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Object o = Array.newInstance(c, n);49
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for (int i = 0; i < n; i++) {51
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String v = cVals[i];53
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Constructor ctor = c.getConstructor(String.class);55
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Object val = ctor.newInstance(v);57
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Array.set(o, i, val);59
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}61
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Object[] oo = (Object[]) o;64
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out.format("%s[] = %s%n", cName, Arrays.toString(oo));66
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// production code should handle these exceptions more gracefully69
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} catch (ClassNotFoundException x) {71
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x.printStackTrace();73
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} catch (NoSuchMethodException x) {75
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x.printStackTrace();77
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} catch (IllegalAccessException x) {79
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x.printStackTrace();81
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} catch (InstantiationException x) {83
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x.printStackTrace();85
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} catch (InvocationTargetException x) {87
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x.printStackTrace();89
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}91
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}93
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}95
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}97
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/*100
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* Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.102
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*104
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* Redistribution and use in source and binary forms, with or without106
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* modification, are permitted provided that the following conditions108
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* are met:110
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*112
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* - Redistributions of source code must retain the above copyright114
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* notice, this list of conditions and the following disclaimer.116
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*118
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* - Redistributions in binary form must reproduce the above copyright120
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* notice, this list of conditions and the following disclaimer in the122
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* documentation and/or other materials provided with the distribution.124
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*126
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* - Neither the name of Oracle or the names of its128
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* contributors may be used to endorse or promote products derived130
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* from this software without specific prior written permission.132
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*134
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS136
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,138
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR140
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