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Programming Articles
Page 2334 of 2547
How Java objects are stored in memory?
A stack and a heap are used for memory allocation in Java. However, the stack is used for primitive data types, temporary variables, object addresses etc. The heap is used for storing objects in memory.Stacks and heaps in Java are explained in more detail as follows −Stack in JavaStacks are used to store temporary variables, primitive data types etc. A block in the stack exists for a variable only as long as the variable exists. After that, the block data is erased and it can be used for storing another variable.
Read MoreHow to create your own helper class in Java?
A helper class serve the following purposes.Provides common methods which are required by multiple classes in the project.Helper methods are generally public and static so that these can be invoked independently.Each methods of a helper class should work independent of other methods of same class.Following example showcases one such helper class.Examplepublic class Tester { public static void main(String[] args) { int a = 37; int b = 39; System.out.println(a + " is prime: " + Helper.isPrime(a)); System.out.println(b + " is prime: " + Helper.isPrime(b)); } } ...
Read MoreRead and write tar archive files using Python (tarfile)
The ‘tar’ utility was originally introduced for UNIX operating system. Its purpose is to collect multiple files in a single archive file often called tarball which makes it easy to distribute the files. Functions in tarfile module of Python’s standard library help in creating tar archives and extracting from the tarball as required. The archives can be constructed with gzip, bz2 and lzma compressions or without any compression at all.Main function defined in this module is main() using which writing to tar file or reading from it is accomplished.Open()This function returns a TarFile object corresponding to file name which is ...
Read MorePython getpass Module
There are two functions defined in getpass module of Python’s standard library. They are useful whenever a terminal based application needs to be executed only after validating user credentials.getpass()This function prompts the user to enter a password. By default the keys entered by user in the terminal are not echoed. Also the default prompt that appears on terminal is ‘password’ which can be customized by providing a string as parameter.In following example, Python prompt is invoked from Command prompt terminal on Windows. The password entered is not echoed in the terminal.C:\python36>python Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 17:00:18) [MSC v.1900 ...
Read MoreSupport for line-oriented command interpreters in Pytho
The cmd module contains only one class called Cmd. This is used as base class for a user defined framework for line oriented command line interpreters.CmdAn object of this class or its subclass provides the line oriented interpreter framework. Important methods of this class inherited by the subclass are listed below.cmdloop()This method sends the object in a loop, accepts inputs and sends the same to appropriate command handler method in the class.As the loop starts an introductory message (give as parameter to cmdloop() method) will be displayed with a default (cmd) prompt which may be customized by prompt attribute.The interpreter ...
Read MoreHow to display HTML in TextView in Android?
In Some situations, we should need to show HTML as text in android. Here is the simple solution to show HTML in TextView 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 code to src/MainActivity.javapackage com.example.andy.myapplication; import android.os.Bundle; import android.support.v4.text.HtmlCompat; import android.support.v7.app.AppCompatActivity; import android.widget.TextView; public class MainActivity extends AppCompatActivity { String htmlText = "What is Android?" + "Android is an open source and Linux-based ...
Read MoreWhat is difference between gravity and layout_gravity on Android?
Android supports both gravity and layout_gravity. Gravity adjusts view position. Using gravity we can do alignment of view as shown below.In the above code Textview going to set in middle of parent layout.Properties of GravityCenter − it going to put view in center of parent layout.Right − it going to put view in right of parent layout.Left − it going to put view in left of parent layout.End − it going to put view in end position of parent layout.Start − it going to put view in start position of parent layout.Top − It going to put view in Top ...
Read MoreHow 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
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