Hands-On Object-Oriented Programming with Kotlin

Calling the Kotlin class

In this section, we will see how to call the Kotlin class in Java. Create a Shape class in Kotlin with three properties, height, width, and area, and two functions, shapeMessage and draw:

class Shape(var width : Int, var height : Int , val shape: String) {    var area : Int = 0    fun shapeMessage(){        println("Hi i am $shape, how are you doing")    }    fun draw() {        println("$shape is drawn")    }    fun calculateArea(): Int {        area = width * height        return area    }}

We can create an instance of the Kotlin class in the same way as we create an instance of a normal Java class. See the following example:

class FromKotlinClass {    public void callShpaeInstance()     {        Shape shape = new Shape(5,5,"Square");        shape.shapeMessage(); shape.setHeight( ...