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Articles by Nishtha Thakur
Page 17 of 40
How to filter array elements in MongoDB?
You can use $setIntersection operator along with aggregate framework to filter array elements in MongoDB. Let us first create a collection with documents −> db.filterArrayElementsDemo.insertOne( { "Scores": [10, 45, 67, 78, 90, 98, 99, 92] } ); { "acknowledged" : true, "insertedId" : ObjectId("5cd2d582b64f4b851c3a13c8") }Following is the query to display all documents from a collection with the help of find() method −> db.filterArrayElementsDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cd2d582b64f4b851c3a13c8"), "Scores" : [ 10, 45, 67, 78, 90, ...
Read MoreHow to ceate right justified JTextField in Java?
To create right justified JTextField, set the alignment to be RIGHT. Here, we will be using the setHorizontalAlignment() method as well and within that the alignment would be set.Create a JTextField −JTextField emailId = new JTextField(20);Now, align it to the right −emailId.setHorizontalAlignment(JTextField.RIGHT);The following is an example to create right justified JTextField −Examplepackage my; import java.awt.FlowLayout; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; import javax.swing.SwingConstants; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Enter emailid..."); JLabel label; frame.setLayout(new FlowLayout()); label = ...
Read Morenextafter() and nexttoward() in C/C++
Here we will see the effect of nextafter() and nextforward() functions in C or C++. These functions are present in the math.h or cmath library.if the functions are like nextafter(a, b) and nextforward(a, b). These functions are used to find the next representable value after a in the direction of b. The nextforward() has more precise second parameter b.Example#include #include main () { //The nextafter function() printf ("Smallest representable number after 0 towards 1 : %e", nextafter(0.0, 1.0)); printf ("Largest representable number before -1 towards 0 :%e", nextafter(0.0, -1.0)); printf ("Largest +ve representable number ...
Read MoreGet at least one match in list querying with MongoDB?
Use $in operator to get at least one match. Let us first create a collection with documents −> db.atleastOneMatchDemo.insertOne({"StudentFavouriteSubject":["MySQL", "MongoDB"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2db5db64f4b851c3a13ce") } > db.atleastOneMatchDemo.insertOne({"StudentFavouriteSubject":["Java", "C", "MongoDB"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2db71b64f4b851c3a13cf") } > db.atleastOneMatchDemo.insertOne({"StudentFavouriteSubject":["Python", "C++", "SQL Server"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2db87b64f4b851c3a13d0") } >db.atleastOneMatchDemo.insertOne({"StudentFavouriteSubject":["Ruby", "Javascript", "C#", "MySQL"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2dba9b64f4b851c3a13d1") }Following is the query to display all documents from a collection with the help of find() method −> db.atleastOneMatchDemo.find().pretty();This will produce the following output −{ "_id" : ...
Read MoreHow do I search according to fields in inner classes using MongoDB db.coll.find()?
Use dot notation(.) to search in inner classes using MongoDB. Let us first create a collection with documents −> db.searchInInnerDemo.insertOne( ... { ... "StudentFirstName" : "Robert", ... "StudentTechnicalDetails": ... { ... "StudentBackEndTechnology" : "MongoDB", ... "StudentLanguage" : "Java" ... } ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5cd2dd89b64f4b851c3a13d2") } > > db.searchInInnerDemo.insertOne( ... { ... "StudentFirstName" : "David", ... "StudentTechnicalDetails": ... { ... ...
Read MoreGet all fields names in a MongoDB collection?
You can use the concept of Map Reduce. Let us first create a collection with documents −> db.getAllFieldNamesDemo.insertOne({"StudentFirstName":"David", "StudentAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5cd998e9b50a6c6dd317ad90") }Following is the query to display all documents from a collection with the help of find() method −> db.getAllFieldNamesDemo.find();This will produce the following output −{ "_id" : ObjectId("5cd998e9b50a6c6dd317ad90"), "StudentFirstName" : "David", "StudentAge" : 23 }Following is the query to get all fields names in a MongoDB collection −> myMapReduce = db.runCommand({ "mapreduce" : "getAllFieldNamesDemo", "map" : function() { for (var myKey in this) { emit(myKey, null); } ...
Read MoreJava Program to enable drag and drop between two text fields in Java
Yes, we can enable drag and drop between two text fields in Java. Let us first create two JTextFields and set content in it as shown below −JTextField one = new JTextField(20); one.setText("You can drag!"); JTextField two = new JTextField(20); two.setText("Drag here or there");Now, we will enable and drag and drop for both the components created above −one.setDragEnabled(true); two.setDragEnabled(true);The following is an example to enable drag and drop between two text fields −Examplepackage my; import java.awt.Container; import java.awt.FlowLayout; import javax.swing.BoxLayout; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; import javax.swing.SwingConstants; public class SwingDemo { public static void main(String[] args) throws Exception ...
Read Morepthread_self() in C
Here we will see what will be the effect of pthread_self() in C. The pthread_self() function is used to get the ID of the current thread. This function can uniquely identify the existing threads. But if there are multiple threads, and one thread is completed, then that id can be reused. So for all running threads, the ids are unique.Example#include #include #include void* func(void* p) { printf("From the function, the thread id = %d", pthread_self()); //get current thread id pthread_exit(NULL); return NULL; } main() { pthread_t thread; // declare thread ...
Read MoreHow to determine if an activity has been called by a Notification in Android?
This example demonstrate about How to determine if an activity has been called by a Notification in AndroidStep 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. Step 3 − Add the following code to src/MainActivity.package app.tutorialspoint.com.notifyme ; import android.app.NotificationChannel ; import android.app.NotificationManager ; import android.app.PendingIntent ; import android.content.Intent ; import android.os.Bundle ; import android.support.v4.app.NotificationCompat ; import android.support.v7.app.AppCompatActivity ; import android.util.Log ; import android.view.View ; public class MainActivity extends AppCompatActivity { public ...
Read MoreHow to allow only a single tree node to be selected in a JTree with Java?
Set the selection mode to SINGLE_TREE_SELECTION, if you want only a single tree node to be selected −tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);The following is an example to allow only a single tree node to be selected in a JTree −Examplepackage my; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.TreeSelectionModel; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Demo"); DefaultMutableTreeNode node = new DefaultMutableTreeNode("Products"); DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Clothing"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Electronics"); DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("Home Decor"); ...
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