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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 collision based protocols like ALOHA, all stations are permitted to transmit a frame without trying to detect whether the transmission channel is idle or busy. This works very good under light loads. Under heavy loads, collision free protocols are suitable, since channel access is resolved in the contention period that ... Read More
At first, create a JDesktopPane −JDesktopPane desktopPane = new JDesktopPane();Now, create an Internal Frame −JInternalFrame intFrame = new JInternalFrame("Our Frame", true, true, true, true); intFrame.setBounds(50, 90, 200, 250);Set Pallette layer for JDesktopPane and add the Internal Frame to JDesktopPane −intFrame.putClientProperty("JInternalFrame.isPalette", Boolean.TRUE); desktopPane.add(intFrame, JDesktopPane.PALETTE_LAYER);The following is an example to set palette layer for JDesktopPane −package my; import java.awt.BorderLayout; import javax.swing.JButton; import javax.swing.JDesktopPane; import javax.swing.JFrame; import javax.swing.JInternalFrame; import javax.swing.JLabel; public class SwingDemo { public static void main(final String[] args) { JFrame frame = new JFrame("Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JDesktopPane desktopPane = new JDesktopPane(); ... Read More
Use aggregation for this and add the values to an array using the $group and $addToSet operatorLet us first create a collection with documents −> dbspecifyReturnFormatDemoinsertOne({"Subject":"MongoDB"}); { "acknowledged" : true, "insertedId" : ObjectId("5cefd364ef71edecf6a1f6c0") } > dbspecifyReturnFormatDemoinsertOne({"Subject":"MySQL"}); { "acknowledged" : true, "insertedId" : ObjectId("5cefd369ef71edecf6a1f6c1") } > dbspecifyReturnFormatDemoinsertOne({"Subject":"SQL Server"}); { "acknowledged" : true, "insertedId" : ObjectId("5cefd36fef71edecf6a1f6c2") }Following is the query to display all documents from a collection with the help of find() method −> dbspecifyReturnFormatDemofind();Output{ "_id" : ObjectId("5cefd364ef71edecf6a1f6c0"), "Subject" : "MongoDB" } { "_id" : ObjectId("5cefd369ef71edecf6a1f6c1"), "Subject" : "MySQL" } { "_id" : ObjectId("5cefd36fef71edecf6a1f6c2"), "Subject" : ... 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 of the column in the ResultSet and returns the URL object in the specified index.ExampleLet us create a table with name tutorials_data in MySQL database using CREATE statement as shown below −CREATE TABLE tutorials_data ( tutorial_id INT PRIMARY KEY AUTO_INCREMENT, tutorial_title VARCHAR(100), tutorial_author VARCHAR(40), submission_date date, ... Read More
To arrange elements of the array following pendulum arrangement.Sort the given array, create an empty array to store the result.Store the 0th element in a variable say temp.Store the element at index 1 in the sorted array in (mid+1)st position of the resultant array, and the next element int the (mid-1)st position and the next element in (mid+2)nd element and so on.Example Live Demoimport java.util.Arrays; import java.util.Scanner; public class ArrayinPendulumArrangement { public static int[] swap(int origPos, int newPos, int[] array){ origPos = 1; newPos = 4; int temp = array[origPos]; ... Read More
Here we will see how to get time (the elapsed time for the program or any other kind of time).Here we are using linux library for C++. There is a structure called timeval. This timeval stores the time in seconds, milliseconds. We can create two time for start and end, then find the difference from them.Example#include #include #include using namespace std; main() { struct timeval start_time, end_time; long milli_time, seconds, useconds; gettimeofday(&start_time, NULL); cout > ch; gettimeofday(&end_time, NULL); seconds = end_time.tv_sec - start_time.tv_sec; //seconds useconds = end_time.tv_usec - start_time.tv_usec; //milliseconds ... Read More
When you want to add to the module search path for a specific package and work with resources included in a package, you need to use pkgutil module from Python library. It includes functions for changing the import rules for Python packages. It is also possible to load non-code resources from files distributed within a package.extend_path(path, name)Extend the search path for the modules which comprise a package. Intended use is to place the following code in a package’s __init__.pyimport pkgutil __path__ = pkgutil.extend_path(__path__, __name__)extend_path() scans sys.path for directories that include a subdirectory named for the package given as the second ... Read More
This example demonstrate about Start and stop an Android notification from broadcast receiverStep 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.os.Bundle ; import android.support.v7.app.AppCompatActivity ; public class MainActivity extends AppCompatActivity { @Override protected void onCreate (Bundle savedInstanceState) { super .onCreate(savedInstanceState) ; setContentView(R.layout. activity_main ) ; } }Step 4 − Add the following code ... Read More
Wireless LANs refer to LANs (Local Area Networks) that use high frequency radio waves instead of cables for connecting the devices. It can be conceived as a set of laptops and other wireless devices communicating by radio signals. Users connected by WLANs can move around within the area of network coverage. Most WLANs are based upon the standard IEEE 802.11 or WiFi.Configuration of Wireless LANsEach station in a Wireless LAN has a wireless network interface controller. A station can be of two categories −Wireless Access Point (WAP) − WAPs or simply access points (AP) are generally wireless routers that form ... 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, 0)); panel1.add(checkBox2, new GridBagConstraints(1, 0, 1, 1, 2.0, 0.0, GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));The following is an example to set two components in the same line −Examplepackage my; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.JPanel; public class SwingDemo { ... Read More