Kotlin – Convert Map to/from Properties

#kotlin #map #properties

https://grokonez.com/kotlin/kotlin-convert-map-tofrom-properties

In the post, we show how to convert 'Kotlin Map to Properties' and versus case 'Properties to Kotlin Map'.

I. Kotlin - Convert Map to Properties

Use toProperties() method of Map class,
-> Method signature:


fun Map.toProperties(): Properties

Practice:


package com.javasampleapproach.kotlin.map2properties

fun main(args: Array) {
    val map = mutableMapOf()
    map.put("db.username", "username")
    map.put("db.password", "password")
    map.put("db.driver", "org.postgresql.Driver")
    map.put("db.url", "jdbc:postgresql://localhost/testdb")
    
    // Converts this [Map] to a [Properties] object.
    // use -> fun Map.toProperties(): Properties
    val propertiesOfMap = map.toProperties()
    
    // Traverse through propertiesOfMap
    propertiesOfMap.forEach{(k, v) -> println("key=$k, value=$v")}
    /*
        key=db.password, value=password
        key=db.url, value=jdbc:postgresql://localhost/testdb
        key=db.username, value=username
        key=db.driver, value=org.postgresql.Driver
     */
}