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How Java is Different from others ?? Unlike other programming language java is compiled and interpreted language. Java IDE acts as a compiler and JVM java virtual machine behave like an interpreter. i.e. when any program let say Hello saved after compiling is in Hello.java extension and after compiling this file we get Hello.Class extension file is called as class-file, byte-code or intermediate code. Byte-code is not dependent for any specific machine so it is also called as intermediate code. To convert this byte-code into machine code or machine understandable format JVM is used which is different for different operating system. JVM is actually a kind of software used for interpreting purpose hence it is called virtual machine. In Java Programming language, why every program is written inside class?            As we Know Java is an Object Oriented programming language so every type of the problem is solved with the representation of the object. And as we als

Performing regression testing for each unit in the application is done by using JUnit testing framework in java. To know whether our created component of program are performing as expected or not, we can use JUnit testing framework. For the sake of simplicity let's perform a JUnit testing (in my case  using Netbeans IDE) for method which simply adds two integer and return the sum of two integers. Class with definiton of sum method Using our Netbeans IDE we can create test files for each individual file, by clicking class name inside the package, hover to tools then select create/update tests. After clicking create Update/Test options we are instructed to select the Testing framework, leave it as default and click ok. After selecting appropriate version of JUnit framework file with classname appended with 'Test'  is created inside Test Packages which includes the method inside our class with test before the actual method name and uppercase for f

After getting familiar with java programming fundamentals one with programming mind always thinks about 'is java pass by value or reference '. Throughout this blog we would be able to conclude that java is pass by value. Java is always pass by value, often confusion occurs when Object are passed into method as arguments. Pass by value: Make a copy in memory of the actual parameter's value that is  passed in. For eg: suppose you hava file1.txt in local disk, let say 'D' drive, copying file1.txt into Desktop and changing it doesn't change the content inside the file1.txt of 'D' drive. Pass by reference: pass a copy of the address of actual parameters. For eg: suppose you created a shortcut file for file1.txt in desktop then changing contents from shortcuts also changes file in 'D' drive. Above program prints 9, from which means copy of value 9 is sent to the argument for test function due to which printing value of x in main method give

Let say we have a xml formatted file as: snapshot of a stack-overflow data dump xml file as posts.xml Here is a sample program to extract title and tag from above xml file using jsoup library in java. Once importing  jsoup library  in our program, we can write program as: public class JsoupParser { public static void main(String[] args) throws Exception { String question; String tag; File fileQuestion = new File( "F: \\ Data \\ stackoverflow.com-Posts \\ posts.xml" ); Document docQuestion = Jsoup. parse (fileQuestion, "UTF-8" ); Elements eachrowQuestion = docQuestion.getElementsByTag( "row" ); for ( int i = 0 ; i < eachrowQuestion.size(); i++) { question= eachrowQuestion.get(i).attr( "Title" ); tag=eachrowQuestion.get(i).attr( "Tags" ); System.out.println(question+ "---->" + tag); } } } Now we can