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”
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:
Continue reading “Java Print Triangle Example.”
This is regarding the terms from Computer Networks TDMA and FDMA. These two pre-3G technologies that have been utilized to improve the performance of the 2G network.
FDMA (Frequency Division Multiplexing Access):
FDMA is a method of dividing a single band into 30 discrete channels. Each channel would then be capable of handling separate traffic, whether it’s a call or a data transfer. This is a higher level of multiplexing and should not be confused with FDM (Frequency Division Multiplexing) which is a low level multiplexing process and occurs on the physical layer. FDMA hardware includes high performance filters that also help it in avoiding near-far problems which can deteriorate the call quality. Continue reading “FDMA vs TDMA.”
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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This is Part III of this jsp and servlet login tutorial. Check Part I and Part II here.
Step 8 ) We are done with the DAOs and Beans. Now we need to create a database from where we will get the authentication details like Username and Password. So, create a database named code2java and therein add a new Table called users. Please take care of the names you provide to table columns. Continue reading “Login Example: JSP and Servlets: Part III.”
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.”
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.
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.”
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.
Continue reading “JDBC – Insert, Update and Delete example.”
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.
Continue reading “JDBC and MySQL Connection tutorial.”
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”