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C# events are used to resolve the hassles in Delegates. One an easily override Delegate properties and that can eventually lead to errors in the code. To avoid this, C# uses Events and defines wrappers around Delegates. Events in C# To use Event, you should define delegate first. Event is a type of Delegate and an example of event can be when a key is pressed. public delegate voide Demo(String val); public event Test TestEvent; An event can hold a delegate like this. this.TestEvent += new Demo (DemoData); ... Read More
Given a 26 letter character set, here we are using a new character set. And another character set just like alphabet set (a, b, c........z), then our task is to make a relation between new character set and that alphabet set. Example New character set: qwertyuiopasdfghjklzxcvbnm Input: "wwmm" Output: bbzy Algorithm Step 1: Given a new character set and input the string to make a relation. Step 2: and the original character set also given below. Step 3: Create a dictionary, we use here map technique, we map the English character set and new given character set, ... Read More
This example demonstrate about how to Create CircularImageView in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 −To make circler view, we should add CircularImageView library in gradle file as shown below.apply plugin: 'com.android.application' android { compileSdkVersion 28 defaultConfig { applicationId "com.example.andy.myapplication" minSdkVersion 15 targetSdkVersion 28 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release ... Read More
Counters in C# are performance counters that lets you know about your applications performance. When you will build an application, whether it is a web app, mobile app or even desktop app, you would definitely need to monitor the performance. For performance counters in C#, use the System.Diagnostics.PerformanceCounter class. Set the instance of the PerformanceCounter class and work with the following properties: CategoryName, CounterName, MachineName and ReadOnly. To get the performance categories. var counter = PerformanceCounterCategory.GetCategories(); Now SET performance counters for the category processor. var counter = PerformanceCounterCategory.GetCategories() .FirstOrDefault(category => category.CategoryName == "Processor");
Our string is − string str = " My make "; Use the following regular expression to find the substring “make” @"\bmake\b" Here is the complete code − Example Live Demo using System; using System.Text.RegularExpressions; namespace RegExApplication { public class Program { private static void showMatch(string text, string expr) { Console.WriteLine("The Expression: " + expr); MatchCollection mc = Regex.Matches(text, expr); ... Read More
The most common databases used in C# are Microsoft SQL Server and Oracle. The following is done to work with databases. Connect Set the Database Name, Optional Parameters and Credentials. The username and password is needed to set a connection to the database. The connection string would look somewhat like this. private static string _connectionString = "Data Source=.;Integrated Security=SSPI;Initial Catalog=test;Application Name=Demo;Connection Timeout2w00"; Above, the Application Name is Demo. Select Statement To fetch data from the database, the SELECT statement is used Insert The INSERT command is used to insert data in the database. Update The database ... Read More
Functional interfaces have a single functionality to exhibit. For example, a Comparable interface with a single method 'compareTo' is used for comparison purpose. Java 8 has defined a lot of functional interfaces to be used extensively in lambda expressions. Following is the list of functional interfaces defined in java.util.Function package. Given below is the list of interfaces in Java8. Sr.No. Interface & Description 1 BiConsumer Represents an operation that accepts two input arguments, and returns no result. 2 BiFunction Represents a function that accepts two arguments and produces a result. ... Read More
A Singleton pattern states that a class can have a single instance and multiple instances are not permitted to be created. For this purpose, we make the constructor of the class a private and return a instance via a static method. But using cloning, we can still create multiple instance of a class. See the example below − Example - Breaking Singleton Live Demo public class Tester{ public static void main(String[] args) throws CloneNotSupportedException { A a = A.getInstance(); ... Read More
Cohesion in C# shows the relationship within modules. It shows the functional strength of the modules. The greater the cohesion, the better will be the program design. It is the dependency between the modules internal elements like methods and internal modules. High cohesion will allow you to reuse classes and method. An example of High cohesion can be seen in System.Math class i.e.it has Mathematical constants and static methods − Math.Abs Math.PI Math.Pow A class that does a lot of things at a time is hard to understand and maintain. This is what we call low cohesion and ... Read More
Given the number, find length of the longest consecutive 1's in its binary representation. Example Input: n = 15 Output: 4 The binary representation of 14 is 1111. Algorithm Step 1: input the number. Step 2: use one counter variable c=0. Step 3: Count the number of iterations to reach i = 0. Step 4: This operation reduces length of every sequence of 1s by one. Example code # Python program to find # length of the longest # consecutive 1s in # binary representation of a number. def maxlength(n): # ... Read More