Java 反射 - 编辑数组长度 [英] Java Reflection - Editing Array Length

问题描述

我想知道是否可以使用 Java 反射 API 更改类的整数数组的长度.如果是这样，如何?

I was wondering if it is possible to change to change the length of a class's integer array using the Java Reflection API. If so, how?

推荐答案

Nope;创建一个固定长度的数组.

Nope; an array is created with a fixed length.

您可以做的是通过在更大数组中使用副本修改字段的值来接近(使用Arrays.copyOf)，只要你知道这样修改不会造成任何不一致.>

What you can do is get close by modifying the value of the field with a copy in larger array (using Arrays.copyOf), so long as you know modifying like this won't cause any inconsistency.

/* desired length */
final int desired = ...;
/* the instance of the object containing the int[] field */
final Object inst = ...;
/* the handle to the int[] field */
final Field field = ...;
field.set(inst, Arrays.copyOf((int[]) field.get(inst), desired));

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