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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to add elements to AbstractList class in Java?
To add elements to AbstractList class, the add() method is provided by the AbstractList class. The elemnt gets appended at the end of the list.The syntax is as follows:public boolean add(E ele)Here, the parameter ele is an element to be appended to this listTo work with the AbstractList class, import the following package:import java.util.AbstractList;The following is an example to add elements to AbstractlList class in Java:Example Live Demoimport java.util.LinkedList; import java.util.AbstractList; public class Demo { public static void main(String[] args) { AbstractList myList = new LinkedList(); myList.add(50); myList.add(100); ...
Read MoreHow to hide the status bar in a iOS App using Swift?
Sometimes in our application, we need to hide the status bar, navigation bar, and other things and only show the content we want to display. In this article, we’ll see how to hide the status bar in our application. To hide status bar in our iOS application using swift language we need to go through very basic steps.We can hide the status bar in two general ways. Both of these methods involve a common step.Common StepGo to Your info.plist file.Add a key called “View controller-based status bar appearance” and set its value to NO.This was a common step we’ll use ...
Read MoreHow to remove all documents from a collection except a single document in MongoDB?
To remove all documents from a collection except a single document in MongoDB, use remove() based on some condition. Let us create a collection with documents. Following is the query>db.removeAllDocumentsExceptOneDemo.insertOne({"StudentName":"Larry", "StudentAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5c9c9de42d66697741252478") } >db.removeAllDocumentsExceptOneDemo.insertOne({"StudentName":"Mike", "StudentAge":21, "StudentCountryName":"US"}); { "acknowledged" : true, "insertedId" : ObjectId("5c9c9dea2d66697741252479") } >db.removeAllDocumentsExceptOneDemo.insertOne({"StudentName":"Chris", "StudentAge":24, "StudentCountryName":"AUS"}); { "acknowledged" : true, "insertedId" : ObjectId("5c9c9def2d6669774125247a") }Following is the query to display all documents from a collection with the help of find() method> db.removeAllDocumentsExceptOneDemo.find().pretty();This will produce the following output{ "_id" : ObjectId("5c9c9de42d66697741252478"), "StudentName" : "Larry", "StudentAge" : ...
Read MoreOperations on struct variables in C
Here we will see what type of operations can be performed on struct variables. Here basically one operation can be performed for struct. The operation is assignment operation. Some other operations like equality check or other are not available for stack.Example#include typedef struct { //define a structure for complex objects int real, imag; }complex; void displayComplex(complex c){ printf("(%d + %di)", c.real, c.imag); } main() { complex c1 = {5, 2}; complex c2 = {8, 6}; printf("Complex numbers are:"); displayComplex(c1); displayComplex(c2); }OutputComplex numbers are: (5 + 2i) (8 + 6i)This works fine as ...
Read MoreFind objects between two dates in MongoDB?
Use operator $gte and $lt to find objects between two dates in MongoDB. To understand these operators, let us create a collection.Creating a collection here:>db.order.insert({"OrderId":1, "OrderAddrees":"US", "OrderDateTime":ISODate("2019-02-19")}; WriteResult({ "nInserted" : 1 }) >db.order.insert({"OrderId":2, "OrderAddrees":"UK", "OrderDateTime":ISODate("2019-02-26")}; WriteResult({ "nInserted" : 1 })Display all documents from the collection with the help of find() method. The query is as follows:> db.order.find().pretty();The following is the output:{ "_id" : ObjectId("5c6c072068174aae23f5ef57"), "OrderId" : 1, "OrderAddrees" : "US", "OrderDateTime" : ISODate("2019-02-19T00:00:00Z") } { "_id" : ObjectId("5c6c073568174aae23f5ef58"), "OrderId" : 2, "OrderAddrees" : "UK", "OrderDateTime" : ISODate("2019-02-26T00:00:00Z") }Here is the query ...
Read MoreHow to set locate to identify required resource bundle in JSP?
The tag is used to store the given locale in the locale configuration variable.AttributeThe tag has the following attributes −AttributeDescriptionRequiredDefaultValueSpecifies a two-part code that represents the ISO-639 language code and an ISO-3166 country code.Yesen_USvariantBrowser-specific variantNoNonescopeScope of the locale configuration variableNoPageExampleResource bundles contain locale-specific objects. Resource bundles contain key/value pairs. When your program needs a locale-specific resource, you keep all the keys common to all the locale but you can have translated values specific to locale. Resource bundles helps in providing content specific to locale.A Java resource bundle file contains a series of key-to-string mappings. The method that we ...
Read MoreHow to Sort a stack in android?
This example demonstrate about How to Sort a stack 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 − Add the following code to res/layout/activity_main.xml. In the above code, we have taken a text view to show sorted stack.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; import android.support.v7.app.AppCompatActivity; import android.widget.TextView; import java.util.Collections; import java.util.HashSet; import java.util.LinkedHashSet; import java.util.LinkedList; import java.util.Stack; public class MainActivity extends AppCompatActivity { ...
Read MoreThe setAtX() method of the Octet Tuple in Java
The setAtX() method is used to set Octet value in Java. Here, X is the index wherein you need to set the value i.e. to set value at index 1, use the setAt1() and value as a parameter.Let us first see what we need to work with JavaTuples. To work with Octet class in JavaTuples, you need to import the following package −import org.javatuples.Octet;Note − Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project -> Properties -> Java Build Path -> Add External Jars and upload the downloaded JavaTuples jar file. ...
Read MoreHow to restrict UITextField to take only numbers in Swift?
In iOS apps sometimes we need to restrict our text field to take only numbers as an input, this can be done in several ways, let’s see some of them.Method 1: Changing the Text Field Type from storyboard.Select the text field that you want to restrict to numeric input.Go to its attribute inspector.Select the keyboard type and choose number pad from there.Method 2: Programmatically limiting inputs to number.Select the text fieldCreate its outlet in the view controller.Conform the view controller to UITextFieldDelegateSet the text field’s delegateAdd the following functionfunc textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool ...
Read MoreHow to loop through collections with a cursor in MongoDB?
Following is the syntax to loop through collections with cursorvar anyVariableName1; var anyVariableName2= db.yourCollectionName.find(); while(yourVariableName2.hasNext()) { yourVariableName1= yourVariableName2.next(); printjson(yourVariableName1); };Let us create a collection with documents. Following is the query> db.loopThroughCollectionDemo.insertOne({"StudentName":"John", "StudentAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5c9ca81f2d6669774125247f") } > db.loopThroughCollectionDemo.insertOne({"StudentName":"Larry", "StudentAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5c9ca8272d66697741252480") } > db.loopThroughCollectionDemo.insertOne({"StudentName":"Chris", "StudentAge":25}); { "acknowledged" : true, "insertedId" : ObjectId("5c9ca8462d66697741252481") } > db.loopThroughCollectionDemo.insertOne({"StudentName":"Robert", "StudentAge":24}); { "acknowledged" : true, "insertedId" : ObjectId("5c9ca8632d66697741252482") }Following is the query to display all documents from a collection with the help of find() method> db.loopThroughCollectionDemo.find().pretty();This will ...
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