Collections in Java Part III : List

Hello Friends,

This is part III for java collections tutorial. Earlier we have discussed regarding SET collection interface in part II. In this, we will be focusing on an interface that is used when the sequence of the elements needs to be maintained, yes that’s right its LIST interface. List interface in Java Collection Framework also extends the base interface, Collection.  Continue reading “Collections in Java Part III : List”

Java Print Triangle Example.

Hello Friends,

This is one of the basic examples for newbies who are still in the learning phase. 🙂 Most of you may get an assignment to print triangle of * or numbers or serial number etc. So, this example if for all those guys n gals. In this example we will print a Right angle triangle where we will print the sequence something like:

1
23
456
78910

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Jsp include file

Hello Friends,

This is one of the simple tutorials on jsp include file. Most of the time in any of the web application we need some part of the application on almost each of the pages. So, writing the code in each of the pages is really tedious and is not the best practice. For example, if we have a web application where we have to use the Header code and Footer code on every page then its the best practice to write the code once in a separate file and then import that file or its contents into the page where we want it to be displayed.

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Login Example: JSP and Servlets: Part II.

Hello Friends,

This is part II of jsp and servlets login example. Check Part I here.

Step 4) Now, we need to create a Servlet file for the redirection of the jsp pages. In the src folder under the package code2java, add the Servlet file and name it as LoginServlet. As discussed earlier this servlet file will get the user details from the Bean file and then it will create a Session for that user only if the user is a valid user. And accordingly it will redirect to the respective jsp pages. You can use the default code which Eclipse generates while Servlet creation, the only change you need to do is in doGet() method. Continue reading “Login Example: JSP and Servlets: Part II.”

Login Example – JSP and Servlets: Part I.

Hello Friends,

This is one of the tutorials on JSP and Servlets. In this we will discuss and create a simple login application using servlets and JSP where we will connect to the DB for the user credentials and then authenticate the users accordingly. First of all we will discuss about what we will need for this.

JSP Pages:

We will create three JSP pages which will be the only viewable parts of our code. The three pages will be as Login Page, Login Success page and the Invalid Login page. Continue reading “Login Example – JSP and Servlets: Part I.”

JDBC – Insert, Update and Delete example.

Hello Friends,

This is the simple example for executing the SQL statements to INSERT, UPDATE or DELETE any records from the database using JDBC. In the below code I have explained all the three operations. When we insert, update or delete any records from the database we are updating the database, hence we use the executeUpdate() function with the Statement.

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JDBC and MySQL Connection tutorial.

Hello Friends,

One of the significant characteristic of any programming language is its connectivity with the database and its operations. Java supports many options to connect to the database and one of the most used database is MySql. JDBC (Java Data Base Connectivity) is used for connecting the java code with the database and it provides cross-DBMS connectivity to a wide range of SQL databases and access to other tabular data sources, such as spreadsheets or flat files. This tutorial shows the jdbc and mySql connection establishment and its use.

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Error: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

Hello Friends,

You may have come across “java.lang.ClassNotFoundException: com.mysql.jdbc.Driver” error/exception while working with java and JDBC. The error occurs mainly when we try to connect to the mySql database from our java code. The error message itself give the clear indication about what we are missing. It says that it is unable to find the Class – “com.mysql.jdbc.Driver”. Continue reading “Error: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver”

Selenium Script for removing users from jira groups.

Hi Team,

This is another tutorial from jira side for the removal of jira users from specific or all groups using a simple selenium script. Selenium makes it easier for the user to perform the task which will take real good time when done manually. In the below example, I have not taken the users list from any external source, but the same is explained in my previous tutorials. Here the user list is a simple string where users are separated by comma and the same are iterated using the for loop.

Continue reading “Selenium Script for removing users from jira groups.”