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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to create a notification with NotificationCompat.Builder in Android?
Before getting into NotificationCompact.Builder, we should know what is a notification in android. Notification is just like as a message showing system on the action bar. just like missed call notification as shown belowThis example demonstrates how to integrate Android Notification.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 code to src/MainActivity.javapackage com.example.andy.myapplication; import android.annotation.SuppressLint; import android.app.Notification; import android.app.NotificationChannel; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Context; import ...
Read Morehow can I design custom toast message in Android?
Before getting into Custom Toast, we should know about what is toast. Toast is used to display message on current screen for sometime. After some time it doing to disappear. In this example we can learn how to customize toast message.This example demonstrate about how to create custom toast message 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 MoreHow to handle Assertion Error in Java?
In order to handle the assertion error, we need to declare the assertion statement in the try block and catch the assertion error in the catch block.Let us see a program on how to handle Assertion Error in Java −Examplepublic class Example { public static void main(String[] args) throws Exception { try { assert args.length > 0; } catch (AssertionError e) { System.out.println(e.getMessage()); } } }Output
Read MoreWhat can be done to control water pollution?
The contamination of water bodies like lakes, rivers, ground water or oceans is termed water pollution. The main cause of this pollution is the discharge of harmful substances into water bodies without being treated. Water is the basic and most important element of life. Hence we must protect it from pollution.Water pollution is caused by many factors. Human or animal wastes, Chemicals released from factories, pesticides and other chemicals used in agriculture, oil spills, wastage from factories directed to water tanks etc., Water pollution has become a serious global problem as will cause many diseases and even deaths.We can control ...
Read MoreExport Preferences to XML file in Java
In order to export preferences to an XML file in Java, we need to use the exportSubtree() method. This method emits an XML document showing all of the preferences contained in this node and all of its descendants. This XML document provides an offline backup of the subtree rooted at the node.Declaration − The java.util.prefs.Preferences.exportSubtree method is declared as follows −public abstract void exportSubtree(OutputStream os) throws IOException, BackingStoreExceptionLet us see a program to export preferences to an XML file in Java −import java.io.FileOutputStream; import java.util.prefs.Preferences; public class Example { public static void main(String args[]) throws Exception { Preferences ...
Read MoreMoving a file from one directory to another using Java
We can use Files.move() API to move file from one directory to another. Following is the syntax of the move method.public static Path move(Path source, Path target, CopyOption... options) throws IOExceptionWheresource − Source path of file to be movedtarget − Target path of file to be movedoptions − options like REPLACE_EXISTING, ATOMIC_MOVEExampleimport java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; public class Tester { public static void main(String[] args) { //move file from D:/temp/test.txt to D:/temp1/test.txt //make sure that temp1 folder exists moveFile("D:/temp/test.txt", "D:/temp1/test.txt"); } private static void moveFile(String ...
Read MoreIs it necessary to bring in automation in every sector of the Indian economy? Won't it deny jobs to millions in an overpopulated country with high unemployment?
Automation is an integral part of the development and progression of equipment and processes that in turn, are integral parts of most of the activities that act as engines of growth across most economies around the world. There's another side to automation and that is the importance of its application in military equipment and processes. It has been seen that nations with a history of producing robust and highly efficient military equipment, are the ones that are dominating the automation industry today.The USA, Germany, Japan, France, UK, Russia, Sweden, Italy, and Canada among a few others dominate in automation excellence.The ...
Read MoreObject Serialization with inheritance in Java
In Serialization when inheritance is introduced then on the basis of superclass and subclass certain cases have been defined which make the understanding of Serialization in each case much simpler. The fundamental rules which should be followed are as below.1. When super class is implements Serializable interface and subclass is not.In this case the object of subclass get serialized by default when superclass get serialize, even if subclass doesn't implements Serializable interface.Examplepublic class TestSerialization { public static void main(String[] args) throws IOException, ClassNotFoundException { B obj = new B(); FileOutputStream fos = new ...
Read MoreHigh-level file operations in Python (shutil)
A number of functions for hgh level operations on files and directories have been defined in shutil module of Python’s standard library.copy()This function copies a file to a specified file in same or other directory. First parameter to the function is a string representation of existing file. Second argument is either name of resultant file or directory. If it is a directory, the file is coped in it with same name. The metadata of original file is not maintained.>>> import shutil >>> shutil.copy("hello.py", "newdir/") 'newdir/hello.py'copy2()This function is similar to copy() function except for the fact that it retains metadata of ...
Read MorePOJI in Java
POJI is an acronym for Plain Old Java Interface which corresponds to a Java standard interface which means that these interfaces are in the context of providing services in JEE. For example, OSGI service is offered through POJI in JEEIn other terms we can say that POJI is an ordinary interface without any specialty that is not inherited from any of the technology API specific interfaces or framework interfaces.Exampleinterface myCustomInterface { public void myMethod(); } interface mySecondCustomInterface extends myCustomInterface { public void mySecondMethod(); }Both interfaces would be called as POJI as they do not inherit any technology specific ...
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