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How to use functions in Java that is exposed from package in Kotlin? Explain it with example codes.

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To use functions in Java that are exposed from a package in Kotlin, you need to follow a few simple steps:

1. Import the Kotlin package in your Java code.

2. Use the fully qualified name of the Kotlin function when calling it from Java.

Here is an example:

Assume you have a Kotlin function named hello() that is exposed from the com.example package. You can use this function in Java code by following these steps:

1. Import the com.example package in your Java code:

import com.example.*;

1. Call the hello() function using its fully qualified name:

String result = com.example.ExampleKt.hello();
System.out.println(result);

The ExampleKt class is a special class that is automatically generated by Kotlin to expose top-level functions, properties, and constants. In this case, the hello() function is a top-level function in the Example.kt file, so it is exposed through the ExampleKt class.

Here's the Kotlin code for the hello() function:

package com.example

fun hello(): String {
    return "Hello from Kotlin!"
}

Note that you need to use the fully qualified name of the Kotlin function, including the Kt suffix, when calling it from Java. In this case, the fully qualified name is com.example.ExampleKt.hello().