Flatten an array of arbitrarily nested arrays of integers into a flat array of integers in Java

MyClass.java

package com.citrusbyte;

import java.util.ArrayList;
import java.util.List;

public class MyClass {

	public static void main(String[] args) {
		
		        /** Array to be flatten **/

		        Object[] inputArray = new Object[]{
		                new Object[]{1, 2, new Object[]{3, new Object[]{14,45,78,new Object[]{8,56,85}}}},
		                new Object[]{4, 22,new Object[]{11,9,29,66}, 51,33,new Object[]{18,42,new Object[]{8,new Object[]{92,50,101},85}}},
		                new Object[]{6,69},
		                new Object[]{100,}
		        };

		        Object[] flatArray = flatten(inputArray);
		        
		        printArray(flatArray);

		    }

		    /**

		     * @param array - Array to be processed;
		     * @return the flat array;
		     */
		    public static Object[] flatten(Object[] array){
		        List<Integer> list  = new ArrayList<Integer>();

		        for (int j = 0; j < array.length; j++) {
		            Integer a = getChildElement(array[j], list);
		            if(a != null) {
		                list.add((int) a);
		            }
		        }
		        return list.toArray();
		    }


		    /**
		     * Search the object which is an integer and add it to a list.     *
		     * @param obj - the item from the list;
		     * @param list - a list which will save the integers;
		     * @return
		     */
		    private static Integer getChildElement(Object obj, List<Integer> list) {
		        if(obj instanceof Integer){
		            list.add((int) obj);
		            return (int) obj;
		        }else{
		            Object[] a = (Object[]) obj;
		            for (int j = 0; j < a.length; j++) {
		            	getChildElement(a[j], list);
		            }
		        }
		        return null;
		    }

		    /**
		     * Print the result
		     * @param list - flat array
		     */
		    public static void printArray(Object[] list){
		        String comma= ",";
		        System.out.print("flatten array = {");
		        for (int i = 0 ; i < list.length ; i++){
		            if(i >= list.length - 1){
		                comma = "";
		            }
		            System.out.print(list[i] + comma);
		        }
		        System.out.print("};");
		    }
}