从反射获取数组的长度

/** from N o w  J a v a  . c o m**/

import java.lang.reflect.Array;

import static java.lang.System.out;


public class ArrayTrouble {

    public static void main(String... args) {

        Object o = Array.newInstance(int.class, 0);

        int[] i = (int[]) o;

        int[] j = new int[0];

        out.format("i.length = %d, j.length = %d, args.length = %d%n",

                i.length, j.length, args.length);

        Array.getInt(o, 0); // ArrayIndexOutOfBoundsException

    }

}