# 
## Overview
In Java, the **`mapToObj()` method** of the `IntStream` interface is used to return an object-valued stream. This stream has the results obtained by applying the implementation of the [`IntFunction`](https://www.educative.io/answers/what-is-the-intfunction-functional-interface-in-java) functional interface.

> Note: `mapToObj()` is an intermediate operation. This operation is performed on a stream instance and results in a stream instance.

# 
#  Syntax

---

``` java
<U> Stream<U> mapToObj(IntFunction<? extends U> mapper);
```

---

# 
#  Parameters 

- **`IntFunction<? extends U> mapper`**: This is the implementation of the `IntFunction` interface.

##
## Return value

This method returns a new object-valued stream.

##
## Example

import java.util.stream.Stream;
import java.util.stream.IntStream;

class Main {
    public static void main(String[] args)
    {
        IntStream stream = IntStream.rangeClosed(2, 7);

        Stream<Integer> integerStream = stream.mapToObj(Integer::bitCount);

        integerStream.forEach(System.out::println);
    }
}

# 
## Explanation

- **Lines 1–2**:  We import the relevant packages.
- **Line 7**: We use the `rangeClosed()` method to create an `IntStream`. 
- **Line 9**: We use the `mapToObj(IntFunction mapper)` of the `IntStream` interface to create a new stream called `integerStream`, which stores the number of set bits of each integer in the stream.
- **Line 11**: We print `integerStream`.

What is the IntStream.mapToObj method in Java?

IntStream's mapToObj() in Java converts int streams to object streams using IntFunction's implementation. It’s an intermediate operation.