How to use ArrayList in Java with Example Programs

Java ArrayList is a dynamic array with resizable-array implementation of Java List interface. In the tutorial, we will learn how to use Java ArrayList by examples:

  • What is Java ArrayList?
  • How to construct a Java ArrayList?
  • Do a Set Operations with Java ArrayList
  • How to Sort Java ArrayList?
  • Use Java ArrayList with Multi-Thread Environment

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How to use Java Stack with Examples

In the tutorial, Grokonez will introduce how to use Java Stack with Examples:

  • How does Java Stack work?
  • Hierarchy of Java Stack
  • Do push, pop, peek, search operations with Java Stack data structure

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How to use Java PriorityQueue with Examples

In the tutorial, Grokonez introduces how to work with Java PriorityQueue by examples:

  • How does Java PriorityQueue work?
  • Explore Java PriorityQueue Hierarchy
  • Create Java PriorityQueue with Integer, String, and Custom Object Class

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Angular 8 – Upload/Display/Delete files to/from Firebase Storage using @angular/fire

In this tutorial, grokonez.com shows you way to upload, get, delete Files to/from Firebase Storage in a simple Angular 8 App using @angular/fire. Files’ info will be stored in Firebase Realtime Database.

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Want to know to to deploy Angular App on Hostings?
>> Please visit this Series (with Instructional Videos)

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Angular 8 Firestore tutorial with CRUD application example – @angular/fire

Cloud Firestore helps us store data in the cloud. It supports offline mode so our app will work fine (write, read, listen to, and query data) whether device has internet connection or not, it automatically fetches changes from our database to Firebase Server. We can structure data in our ways to improve querying and fetching capabilities. This tutorial shows you how to work with Firebase Firestore along with an Angular app that can do CRUD Operations.

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Angular 8 – Upload/Display/Delete files to/from Firebase Storage using @angular/fire

[Continue reading…] “Angular 8 Firestore tutorial with CRUD application example – @angular/fire”

How to use Java 8 Stream Collectors.groupingBy() Examples


In the tutorial, Grokonez will show how to use Grouping By APIs of Java Stream Collectors by examples:

  • Explore Stream GroupingBy Signatures
  • Combine groupingBy API with others Reduction Operations

Now let’s do more details!

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Angular 8 Firebase CRUD operations with @angular/fire

In this tutorial, we’re gonna create a simple Angular 8 Application that does CRUD to create, read, update, delete data to/from Firebase Realtime Database using @angular/fire.

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[Continue reading…] “Angular 8 Firebase CRUD operations with @angular/fire”

Java 8 Stream.collect() – Stream.Collectors APIs Examples


Java 8 provides an extremely powerful abstract concept Stream with many useful mechanics for consuming and processing data in Java Collection. In the tutorial, We will do lots of examples to explore more the helpful of Stream API with Collectors operation on the specific topic: “Java 8 Stream Collector”.

What will we do?

  • Explore Stream Collect Method signatures
  • Apply Stream Collectors Util with Examples

Now let’s do more details!

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[Continue reading…] “Java 8 Stream.collect() – Stream.Collectors APIs Examples”

Angular 8 Firebase tutorial: Integrate Firebase into Angular 8 App with @angular/fire

Firebase is a mobile and web application development platform developed by Google. We can build our apps very fast, without making complex back-end system. It helps to scale automatically, for even the largest apps. In this Angular 8 Firebase tutorial, we’re gonna integrate Firebase into Angular 8 App with @angular/fire module (official library for Firebase and Angular).

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[Continue reading…] “Angular 8 Firebase tutorial: Integrate Firebase into Angular 8 App with @angular/fire”

How to use Java 8 Stream Reduce Examples with List and Array


Java 8 provides an extremely powerful abstract concept Stream with many useful mechanics for consuming and processing data in Java Collection. In the tutorial, We will do lots of examples to explore more the helpful of Stream API with reduction operation on the specific topic: “Java 8 Stream Reduce Collection”.

What will we do?

  • Explain how Java 8 Stream Reduce work?
  • Apply Stream Reduction on Java List, Array

Now let’s do examples for more details!

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[Continue reading…] “How to use Java 8 Stream Reduce Examples with List and Array”