Introduction : ArrayList is more flexible than the array. But sometimes we need to convert an ArrayList to an array and this tutorial will show you different ways to convert ArrayList to an array in Java. We have different ways to do this conversion. Let’s take a look : Using a loop : This is […]
How to split a string in Dart
Introduction : Splitting a string is available in almost all programming languages. Splitting divides a string in different parts based on one expression or rule. In dart also, we have an inbuilt splitting method known as split(). We can define it as below : List split(Pattern pattern); It takes one Pattern as input. Based on […]
Dart comparable example for comparing objects
How to use Comparable for comparing objects in Dart : Comparing two custom object can be done using Comparable interface. If you are familiar with Java, it works in a similar manner. In this tutorial, I will show you two examples of how to use it in Dart. Suppose, we have a list of students […]
How to create a simple and capped collection in MongoDB
Introduction : Collections are used to group MongoDB documents. If you are familier with RDBMS, you can think it like a table. Collections are created within a database. Again, documents are created within collection. These documents contains different different fields with different data. In this tutorial, we will show you how to create a collection […]
MongoDB tutorial : How to drop a database in MongoDB
Introduction : Drop a database means deleting a database. If you drop a database, it will remove everything inside it.In this tutorial, we will show you how to drop a database in MongoDB. Drop a database in MongoDB : Command db.dropDatabase() is used to drop any database if you are currently inside the database. It […]
How to create a database in MongoDB and insert data
Introduction : Database is used in MongoDB to store all different types of collections and each collection stores documents. We will come to this later, but before that let’s learn how to create a database and how to move between databases. Creating and moving between databases : First of all, open your mongo shell and […]
How to convert a string to DateTime and DateTime to ISO8601 in Dart
Dart : Converting a string to DateTime and DateTime to ISO8601 string : In dart, we can easily convert a string to a DateTime object. DateTime.parse() method takes one correctly formatted string as input and convert it to a DateTime object. Similarly, we can convert a DateTime object to a ISO8601 string using toIso8601String() method. […]
Different usage of super keyword in Java
Different usage of super keyword in Java : super keyword is used to refer the parent class object. In this tutorial we will learn main three different usages of super : 1. Accessing values of parent class. 2. Accessing methods of parent class. 3. Invoking constructor of parent class. Accessing values of a parent class […]
Kotlin program to change uppercase and lowercase of a string
Introduction : This is a simple kotlin sample program that will show you how to check if a character is lowercase or uppercase and how to convert it to a lowercase or uppercase character. 1. One string is given, we will scan each character of the string one by one. 2. For each character, check […]
Kotlin tutorial : Character in kotlin and functions of Character class
Character in kotlin : In Kotlin, we use “Char” to represent a character. Also, we can create one character variable by using one single quote pair. For example, for the following program : fun main(args: Array) { val letter = ‘c’ println(“Current value of ‘letter’ is ” + letter) if(letter is Char){ println(“It is a […]