**`identity`** is a static method of the `Function` interface that always returns the input argument.

# 
#  Syntax

```java
static <T> Function<T, T> identity()
```

## Parameters

The method has no parameters.

## Return value

The method returns a function that always returns its input argument.


##
## Code

import java.util.function.Function;

public class Main {

    public static void main(String[] args){
        Function<Integer, Integer> identity = Function.identity();
        int arg = 1;
        System.out.printf("(%s == identity.apply(%s)) = %s", arg, arg, (arg == identity.apply(arg)));
    }
}

# 
## Explanation

- **Line 1** - We import the `Function` interface.
- **Line 6** - We define an identity function using the `identity()` method.
- **Line 7** - We define an integer called `arg`.
- **Line 8** - We check whether `arg` and the value returned are equal. We do this by using the `apply()` method passing `arg` as an argument are equal.

What is the identity method of the Function interface in Java?

The `identity` method of the Function interface returns its input argument unchanged.