Java Reflection - Array.getLength() Examples

package com.logicbig.example.array;

import java.lang.reflect.Array;

public class GetLengthExample {

    public static void main(String... args) {
        double[] arr = {1, 4, 9};
        int length = Array.getLength(arr);
        System.out.println(length);
    }
}

package com.logicbig.example.array;

import java.lang.reflect.Array;

public class GetLengthExample2 {

    public static void main(String... args) {
        Object o = "";
        System.out.println(isEmpty(o));
        o = new int[]{};
        System.out.println(isEmpty(o));
    }

    private static boolean isEmpty(Object o) {
        if (o == null) {
            return true;
        }
        if (o instanceof String) {
            System.out.println("-- string --");
            return ((String) o).length() == 0;
        }
        if (o.getClass().isArray()) {
            System.out.println("-- array --");
            return Array.getLength(o) == 0;
        }
        return false;
    }

}