Adaptive Tree Walk Protocol is a technique for transmitting data over shared channels that combines the advantages of collision based protocols and collision free protocols.In computer networks, when more than one station tries to transmit simultaneously via a shared channel, the transmitted data is garbled, an event called collision. In ... Read More

A DATALINK object represents an URL value which refers to an external resource (outside the current database/data source), which can be a file, directory etc..You can retrieve a DATALINK object an SQL table using the getURL() method of the PreparedStatement interface. This method accepts an integer value representing an index ... Read More

To align two components in the same line, you need to set the contrainsts of the GridBagConstraints properly. Let’s say we have two components in panel1. Set the contraints using Insets as well −panel1.add(checkBox1, new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0,    GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, ... Read More

In wireless LANs ( wireless local area networks), the hidden terminal problem is a transmission problem that arises when two or more stations who are out of range of each other transmit simultaneously to a common recipient. This is prevalent in decentralised systems where there aren’t any entity for controlling ... Read More

Auto layout is constraint based layout system used for development of User Interfaces for iOS Devices. This layout based constraint system also known as Auto Layout is basically an adaptive UI which adapts to screens of different sizes and orientations.Auto layout is completely dependent on constraints where developer defines a ... Read More

You can use pop() for this. Let us first create a collection with documents −> db.persistChangeDemo.insertOne({"Name" : "Larry", "CreditScore": [500, 700, 760, 100]}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cdfc52cbf3115999ed51203") }Following is the query to display all documents from a collection with the help of find() method −> ... Read More

Locking of iOS device cannot be done programmatically without the use of Private API’s. One such private API’s GSEventLockDevice() (private API) from GraphicsServices.framework which might help you achieve your persona but the application would result in rejection from Apple’s App Store.More over there’s no documentation provided by apple for the ... Read More

This example demonstrate about How to use Notification.deleteIntent 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 ... Read More

You cannot use from as a column name directly because from is a reserved word in MySQL. To avoid this, you need to use backtick symbol. Let us first create a table −mysql> create table DemoTable    (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    `from` varchar(100),   ... Read More

SQL databases provide a datatype named Blob (Binary Large Object) in this, you can store large binary data like images.To store binary (stream) values into a table JDBC provides a method called setBinaryStream() in the PreparedStatement interface.It accepts an integer representing the index of the bind variable representing the column ... Read More