Apache Tomcat- Ubuntu

Tomcat is a web-container that allows to run servelet and Java Server Pages (JSP) based web applications.

Tomcat Usages

A container that allows running web applications.
Can use as HTTP server(default port : 8080)

Installation

Follwing steps are described to install Tomcat7 in Ubuntu OS using terminal.

sudo apt-get install tomcat7
sudo apt-get install tomcat7-admin
sudo apt-get install tomcat7-docs
sudo apt-get install tomcat7-examples

Start/Stop Tomcat Server

In Ubuntu after istalling Tomcat server it will start automaticaly. But if you want to restart the server you can use follwing command

sudo /etc/init.d/tomcat7 restart

If you want to stop the Tomcat Server you can issue following command.

sudo /etc/init.d/tomcat7 stop

Test The Server

After starting the Tomcat server you can check it by entering the following URL in the brower

http://localhost:8080

Admin Console

Tomcat provides a web based administration console and you can access it using following credentials.

Default username = admin and password = admin

If you want to reset the administation credentials you can follow below steps.

sudo gedit etc/tomcat7/tomcat-users.xml

And the add the following lines in between <users> tag

Comments

Object Oriented Programming (OOP)

Object Object is an entity that has state and behavior Class Collection of objects is known as class. There are four main types of OOP concepts Inheritance Object acquire all the properties and behavior of parent object Improve code re-usability Polymorphism One task is performed by different ways Use method overload and override Abstraction Hiding internal details and showing functionality Use abstract class and interfaces Encapsulation Binding code and data into a single unit

Sorting Algorithms

Bubble Sort Named as sinking sort. Compare each pair of the adjacent items and swap them if they are in the wrong order. Worst case and average case time complexity both O(n^2) and best case time complexity is O(n).

Java-8

Java 8 New Features There are several new features added in Java 8 version. Some of the important new features are: Define methods inside the interface For each method Lambda Expression Stream API DateTime API 1) Define methods (default, static) inside the Interface After you published your interface, you can't change it by adding some abstract methods. But if you want to add methods you can define those methods inside the interface. Therefore Java 8 support default and static methods inside the interface. In Java 7 version interface only have abstract methods (no method implementation) and an abstract class can have both abstract and non-abstract methods. In Java 8 version you can add method implementation in the interface, but you have to declare that method as default method. ex: default void show(){............} To avoid diamond problem you have to override the method in implementation class if two interfaces have same default method ...

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