Using Kotlin with Java

We will now discuss how to work with Kotlin and Java in the project that we created.

In this section, we will learn how to use Kotlin in an existing Java project, and Java in an existing Kotlin project.

One of Kotlin's important features is its interoperability with Java. If we have an existing Java project, we can add new code in Kotlin or we can convert the existing Java code to Kotlin.

Kotlin in an existing Java project

Let's look at an example of how to add Kotlin code to an existing Java project created using Maven. We have created a simple Maven project that has some code written in Java. This is shown here:

We can add Kotlin code to it as follows.

1. Right-click on src/main/java and...