多维数组的长度java的反思 [英] Multi-Dimension length array reflection java

问题描述

我要如何找到一个多维数组与Java反射的长度？

How do I find the length of a multi-dimensional array with reflection on java?

推荐答案

Java数组有每个实例的长度，而不是在同一维度所有数组必须有相等的长度。这就是说，你可以得到实例的长度中。

Java arrays have lengths per instance, not all arrays in the same dimension have to have equals lengths. That said, you can get the lengths of instances in the.

尺寸可以通过在他们的名字[的数目进行计数，这比降类型层次更快。下面code：

Dimensions can be counted by the number of '[' in their name, this is quicker than descending the type hierarchy. The following code:

		int[][][] ary = {{{0},{1}}};

		Class cls = ary.getClass();

		boolean isAry = cls.isArray();
		String clsName = cls.getName();

		System.out.println("is array=" + isAry);
		System.out.println("name=" + clsName);

		int nrDims = 1 + clsName.lastIndexOf('[');

		System.out.println("nrDims=" + nrDims);

		Object orly = ary;

		for (int n = 0; n < nrDims; n++) {

			int len = Array.getLength(orly);

			System.out.println("dim[" + n + "]=" + len);

			if (0 < len) {
				orly = Array.get(orly, 0);
			}
		}

给出了以下的输出：

gives the following output:

is array=true
name=[[[I
nrDims=3
dim[0]=1
dim[1]=2
dim[2]=1

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