Java中給數(shù)組動(dòng)態(tài)擴(kuò)容的方法，代碼如下：
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import java.lang.reflect.Array;
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/**
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* 數(shù)組動(dòng)態(tài)擴(kuò)容
5 * @author Administrator
6 *
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*/
8public class ArrayGrow {
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/**
11 * 動(dòng)態(tài)給數(shù)組擴(kuò)容
12 * @param obj 需要擴(kuò)容的數(shù)組
13 * @param addLength 給數(shù)組增加的長(zhǎng)度
14 * @return
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*/
16 @SuppressWarnings("unchecked")
17 public static Object arrayGrow(Object obj, int addLength) {
18 Class clazz = obj.getClass();
19 if(!clazz.isArray()) {
20 return null;
21 }
22 Class componentType = clazz.getComponentType();
23 int length = Array.getLength(obj);
24 int newLength = length + addLength;
25 Object newArray = Array.newInstance(componentType, newLength);
26 System.arraycopy(obj, 0, newArray, 0, length);
27 return newArray;
28 }
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30 public static void main(String[] args) {
31 int[] a = {1, 2, 3};
32 a = (int[]) arrayGrow(a, 3);
33 for (int i = 0; i < a.length; i++) {
34 System.out.print("a[" + i + "] = " + a[i] + " ");
35 }
36 System.out.println();
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38 String[] b = {"Jade", "TT", "JadeLT"};
39 b = (String[]) arrayGrow(b, 3);
40 for (int i = 0; i < b.length; i++) {
41 System.out.print("b[" + i + "] = " + b[i] + " ");
42 }
43 }
44}
main方法里的測(cè)試數(shù)據(jù)輸出結(jié)果如下：
a[0] = 1 a[1] = 2 a[2] = 3 a[3] = 0 a[4] = 0 a[5] = 0
b[0] = Jade b[1] = TT b[2] = JadeLT b[3] = null b[4] = null b[5] = null