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Articles by Ankith Reddy
Page 9 of 73
Initialize HashSet in Java
A set is a collection which does not allows duplicate values. HashSet is an implementation of a Set. Following are the ways in which we can initialize a HashSet in Java.Using constructor − Pass a collection to Constructor to initialize an HashSet.Using addAll() − Pass a collection to Collections.addAll() to initialize an HashSet.Using unmodifiableSet() − Pass a collection to Collections.unmodifiableSet() to get a unmodifiable Set.Using add() − Using add(element) method of Set.Following is an example of using above ways.ExampleInfinityNow consider the following code snippet.Exampleimport java.util.Arrays; import java.util.Collections; import java.util.HashSet; import java.util.List; import java.util.Set; public class Tester{ public static ...
Read MoreGet the unqualified name of a class in Java
A qualified class name in Java contains the package that the class originated from. In contrast to this, the unqualified class name contains only the class name without any package information. A program that gets the unqualified name of a class is given as follows:Examplepublic class Demo { public static void main(String[] argv) throws Exception { Class c = java.util.ArrayList.class; String className = c.getName(); System.out.println("The qualified class name is: " + className); if (className.lastIndexOf('.') < 0) { className = className.substring(className.lastIndexOf('.') + 1); ...
Read MoreC# Program to find a key in Dictionary
Firstly, set a Dictionary collection with elements.Dictionary d = new Dictionary() { {1, "Applianes"}, {2, "Clothing"}, {3, "Toys"}, {4, "Footwear"}, {5, "Accessories"} };Now, let’s say you need to check whether key 5 exists or not. For that, use ContainsKey() method. It returns True if key is found.d.ContainsKey(5);Let us see the complete code.Exampleusing System; using System.Collections.Generic; public class Program { public static void Main() { Dictionary d = new Dictionary() { {1, "Electronics"}, {2, "Clothing"}, {3, "Toys"}, ...
Read MoreUsing reflection to check array type and length in Java
The array type can be checked using the java.lang.Class.getComponentType() method. This method returns the class that represents the component type of the array. The array length can be obtained in int form using the method java.lang.reflect.Array.getLength().A program that demonstrates this is given as follows −Exampleimport java.lang.reflect.Array; public class Demo { public static void main (String args[]) { int[] arr = {6, 1, 9, 3, 7}; Class c = arr.getClass(); if (c.isArray()) { Class arrayType = c.getComponentType(); System.out.println("The array is of type: " ...
Read MoreConvert.ToUInt64 Method in C#
Use the Convert.ToUInt64() method to convert a specified value to a 64-bit unsigned integer.The following is our char.char ch = 'a';Now, let’s convert it to a 64-bit unsigned integer.ulong res; res = Convert.ToUInt64(ch);Here is the complete example.Exampleusing System; public class Demo { public static void Main() { char ch = 'a'; ulong res; res = Convert.ToUInt64(ch); Console.WriteLine("Converted char value '{0}' to {1}", ch, res); } }OutputConverted char value 'a' to 97
Read MoreC# Program to access tuple elements
Create a tuple.var myTuple = Tuple.Create(1, 2.5M, "Amit", "100");Now to access tuple elements, use the properties.To access first element.myTuple.Item1To access second element.myTuple.Item2In the same way, for other elements, use the properties as shown below −Exampleusing System; public class Program { public static void Main() { var myTuple = Tuple.Create(1, 2.5M, "Amit", "100"); Console.WriteLine("Item1 : "+ myTuple.Item1); Console.WriteLine("Item2 : "+ myTuple.Item2); Console.WriteLine("Item3 : "+ myTuple.Item3); Console.WriteLine("Item4 : "+ myTuple.Item4); } }OutputItem1 : 1 Item2 : 2.5 Item3 : Amit Item4 : 100
Read MoreConstructor Overloading in C#
When more than one constructor with the same name is defined in the same class, they are called overloaded, if the parameters are different for each constructor.Let us see an example to learn how to work with Constructor Overloading in C#.In the example, we have two subjects and a string declaration for Student Name.private double SubjectOne; private double SubjectTwo; string StudentName;We are showing result of three students in different subjects. For our example, to show constructor overloading, the name is only displayed for student 3rd.Student s1 = new Student(); Student s2 = new Student(90); Student s3 = new Student("Amit", 88, ...
Read MoreGet floor value of a number using Math.floor in Java
To get the floor value of a number, we use the java.lang.Math.floor() method. The Math.floor() method returns the largest (closest to positive infinity) double value which is less than or equal to the parameter and has a value which is equal to a mathematical integer on the number line. If the parameter is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.Declaration - The java.lang.Math.floor() method is declared as follows −public static double floor(double a)Let us see a program to get the floor value of a number in Java.Exampleimport java.lang.Math; ...
Read MoreHeader files “stdio.h” and “stdlib.h” in C
stdio.hThe header file stdio.h stands for Standard Input Output. It has the information related to input/output functions.Here is the table that displays some of the functions in stdio.h in C language, Sr.No.Functions & Description1printf()It is used to print the strings, integer, character etc on the output screen.2scanf()It reads the character, string, integer etc from the keyboard.3getc()It reads the character from the file.4putc()It writes the character to the file.5fopen()It opens the file and all file handling functions are defined in stdio.h header file.6fclose()It closes the opened file.7remove()It deletes the file.8fflush()It flushes the file.Here is an example of stdio.h in C language, ...
Read Morefilter_has_var() function in PHP
The filter_has_var() function is used to check that variable of specified type exists or not.Syntaxfilter_has_var(type, var)Parameterstype − There are five types of inputs to check i.e. INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, or INPUT_ENV.var − The name of variable.ReturnThe filter_has_var() function returns true on success and false on failure.ExampleThe following is an example that is a quick check for the input variable "email”. The value INPUT_GET is used for this.
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