To retrieve a nested object in MongoDB, use $ operator. Let us first create a collection with documents −> db.queryNestedObject.insertOne( ...    { ...       "StudentName" : "James", ...       "StudentSubjectScore" : [ ...          {"StudentMongoDBScore":98}, ...          {"StudentCScore":92}, ... ... Read More

To calculate timestamp difference, use aggregate framework. Let us first create a collection with documents −> db.timestampDifferenceDemo.insertOne({    "MovieBeginningTime": new ISODate("2019-05-12 10:20:30"),    "MovieEndingTime":new ISODate("2019-05-12 12:30:20") }); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd7ba1f6d78f205348bc644") } > db.timestampDifferenceDemo.insertOne({    "MovieBeginningTime": new ISODate("2019-05-12 04:00:00"),    "MovieEndingTime":new ISODate("2019-05-12 07:10:00") }); { ... Read More

Here we will see how we can create a system, where we will create one client, and a server, and the client can send one string to the server, and the server will reverse the string, and return back to the client.Here we will use the concept of socket programming. ... Read More

This example demonstrate about How to schedule local notification 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. Step 3 − Add the following ... Read More

You can work with aggregate framework and use $sort, $skip and $limit to display distinctly ordered records with skip and also set the limit. Let us first create a collection with documents> db.orderedDistinctDemo.insertOne({"Name":"John"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5ccfb8e0140b992277dae0e9") } > db.orderedDistinctDemo.insertOne({"Name":"Larry"}); {    "acknowledged" : true, ... Read More

The DefaultTableModel is an implementation of TableModel that uses a Vector of Vectors to store the cell value objects. At first create a two dimensional array for rows and columns −DefaultTableModel tableModel = new DefaultTableModel(new Object[][] {    { "India", "Asia" }, { "Canada", "North America" }, { "Singapore", "Asia" ... Read More

You can use update command to add a field to existing record. Let us first create a collection with documents −> db.addAFieldToEveryRecordDemo.insertOne({"ClientName":"Chris", "ClientAge":34}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd00e32588d4a6447b2e061") } > db.addAFieldToEveryRecordDemo.insertOne({"ClientName":"Robert", "ClientAge":36}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd00e59588d4a6447b2e062") }Following is the query to ... Read More

Let’s say the following is our JTextPane with orange background color −JTextPane textPane = new JTextPane(); textPane.setBackground(Color.orange);Now, set the style and attributes. Also, set the font −SimpleAttributeSet attributeSet = new SimpleAttributeSet(); StyleConstants.setItalic(attributeSet, true); textPane.setCharacterAttributes(attributeSet, true); textPane.setText("Recall this and "); Font font = new Font("Verdana", Font.BOLD, 22); textPane.setFont(font);After the text displayed ... Read More

Here we will see some different types of variable declaration based on integer pointers integer constants and the integer constant pointers.To determine them we will use the Clockwise/Spiral Rule. By discussing the terms, we can understand the rules also.The const int *. This is used to tell the compiler that ... Read More

You can use remove() for this. Let us first create a collection with documents −> db.deleteDataDemo.insertOne({_id:1, "Name":"Larry"}); { "acknowledged" : true, "insertedId" : 1 } > db.deleteDataDemo.insertOne({_id:2, "Name":"Chris"}); { "acknowledged" : true, "insertedId" : 2 } > db.deleteDataDemo.insertOne({_id:3, "Name":"Robert"}); { "acknowledged" : true, "insertedId" : 3 } > db.deleteDataDemo.insertOne({_id:4, "Name":"David"}); ... Read More