Klerith

import 'dart:async';
// Creditos
// https://stackoverflow.com/a/52922130/7834829

class Debouncer<T> {

  Debouncer({ 
    required this.duration, 
    this.onValue 
  });

Klerith

    <!-- Internet -->
    <uses-permission android:name="android.permission.INTERNET"/>
    
    <!-- State -->
    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
    <uses-permission android:name="android.permission.WAKE_LOCK" />

    <!-- Permissions options for the `location` group -->
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

EduardinDev

public static void main (String[] args) {
    //a map with key type : String, value type : String
    Map<String,String> mp = new HashMap<String,String>();
    mp.put("John","Math");    mp.put("Jack","Math");    map.put("Jeff","History");

    //3 differents ways to iterate over the map
    for (String key : mp.keySet()){
        //iterate over keys
        System.out.println(key+" "+mp.get(key));
    }