Kotlin Class: Data class point with destructuring declaration

Last update on February 05 2025 05:42:08 (UTC/GMT +8 hours)

Write a Kotlin program that creates a data class 'Point' with properties for x and y coordinates. Use a destructuring declaration to extract the coordinates.

Pre-Knowledge (Before You Start!)

Before attempting this exercise, you should be familiar with the following concepts:

Data Classes: Special classes in Kotlin that are used to hold data. They automatically generate useful functions like toString(), equals(), and hashCode().
Class Properties: Understanding how to define properties inside a Kotlin class.
Destructuring Declarations: A Kotlin feature that allows you to extract multiple values from an object into separate variables.
Printing to Console: Using println() to display values.

Hints (Try Before Looking at the Solution!)

Try to solve the problem using these hints:

Hint 1: Define a data class named Point with properties x and y.
Hint 2: In the main() function, create an instance of the Point class with sample values.
Hint 3: Use a destructuring declaration to extract the values of x and y from the object.
Hint 4: Print the extracted coordinates using println().

Sample Solution:

Kotlin Code:

data class Point(val x: Int, val y: Int)

fun main() {
    val point = Point(12, 20)
    
    val (x, y) = point  // Destructuring declaration
    
    println("Coordinates: x = $x, y = $y")
}

Sample Output:

Coordinates: x = 12, y = 20

Explanation:

In the above exercise -

First we define a data class "Point" with properties for x and y coordinates. The data modifier automatically generates useful functions such as toString, equals, and hashCode for the class.
In the "main()" function, we create an instance of Point with x coordinate as 12 and y coordinate as 20.
The line val (x, y) = point is a destructuring declaration. It allows us to extract the values of x and y properties from the point object and assign them to the variables x and y respectively.
Finally, we print the extracted coordinates using the println() function.

Kotlin Editor:

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