Yes, you can have an array of object type in Java. An array in Java is a container that holds a fixed number of values of a single type. The type of an array can be an object type, such as Object, or any other class type. For example, the following code creates an array of Object type that contains three elements: an int, a String, and another Object array:
Object[] array = { 1, "Hello", new Object[]{ 3, 4, 5 } };
To flatten this array using the Stream API, you can use the flatMap() method to convert each element in the array into a stream, and then concatenate all the streams into a single stream. You can then use the toArray() method to convert the stream of objects into an array of the desired type.
Here is an example of how you can implement the flatten() method to flatten an array of objects:
<pre>public static Integer[] flatten(Object[] inputArray) {
Stream<Object> stream = Arrays.stream(inputArray);
stream = stream.flatMap(o -> o instanceof Object[] ? flatten((Object[])o) : Stream.of(o));
Integer[] flattenedArray = stream.toArray(Integer[]::new);
return flattenedArray;
}
You can then use the flatten() method as follows:
Object[] array = { 1, 2, new Object[]{ 3, 4, new Object[]{ 5 }, 6, 7 } };
Integer[] flattenedArray = flatten(array);
The resulting flattenedArray will be an array of integers containing the following elements: [1, 2, 3, 4, 5, 6, 7].