output

URL to fetch = https://en.wikipedia.org/w/api.php?action=query&prop=revisions&rvprop=content&format=json&titles=Java_virtual_machine
Largest word=Is_there_any_protection_against_Java_exploits
Java=132

Wikipedia.kt

import java.util.*
import kotlin.comparisons.compareBy
import kotlin.comparisons.thenBy

fun main(args: Array<String>) {
    if (args.size == 0) {
        println("Provide a Wikipedia page to fetch")
        return
    }
    val apiEndpoint = "https://en.wikipedia.org/w/api.php?action=query&prop=revisions&rvprop=content&format=json&titles=" + args[0]

    println("URL to fetch = ${apiEndpoint}")

    val pageContents = java.net.URL(apiEndpoint).readText()
    val words = Regex("(\\w+)").findAll(pageContents)
    val largestWord = (words.maxBy{ it.value.length })?.value

    println("Largest word=${largestWord}")

    val occurrences = HashMap<String, Int>()
    words.forEach {
        if (occurrences.containsKey(it.value)) {
            var count = occurrences.get(it.value)
            occurrences.put(it.value, count!!.inc())
        } else {
            occurrences.put(it.value, 1)
        }
    }

    // sort map based on number of occurances
    val sortedOccurrences = occurrences.toSortedMap(compareBy<String> { it.length }.thenBy { it })

    // filter out words of 1 char (i.e. n or e) and 'the'
    val filtedOccurrences = sortedOccurrences.filterKeys { it.length > 1 }.filterKeys { !it.equals("the") }

    println(filtedOccurrences.maxBy { it.value })
}