Monthly Archives: August 2017

Explain The Concept Of Java Threading

In this concept called Java Thread, we are going to refer about two basic units of execution Process and Thread. Java threads also has concurrency programming concerned with it. For more information Join the Java training institute.

1) Process

Program or Application is the view of the self possessed execution environment called the process. There are multiple process inside the program. There are different classes and programs called process and the Java runtime environment runs as this.

2) Thread

Lightweight process is the other name for Thread. For creating and existing in the process there are only less resources required by the process and the process resource is shared by the threads.

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3) Java Thread Example

Main Thread is the only thread that every Java application has. Like memory management, signal processing, system management there are lots of Java threads running in the memory. The first Java thread also called as main is considered from the application point of view and there are multiple threads that can be created.

In a single program if there are two or more executing concurrent threads called Multi threading. Only one thread can be executed at a time and time slicing is the OS feature for sharing processor time between threads and processes.

Advantages of Java Thread

1) When compared to processes, Java threads are less in weight and for the resource creating a thread, less time is required.

2) The cost is less in context switching between threads when compared to processes.

3) When compared to process communication, thread intercommunication is quite easy.

Read More :  Trends In Java Tools and Technologies

Runnable Vs Thread

If there is more functionality offered than simply running as Thread, you need to apply Runnable Interface for offering a method to run it as Thread. Thread class can be extended if you need class only goal for running as Thread.

Java aids implementing lots of interfaces and therefore implementing Runnable is preferred. There is a possibility of extending other class if you can extend Thread class.

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How To Begin With Java Machine Learning?

Java machine learning and the best tools to get started with

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Although Java is present ancestrally today most of the talk is about artificial intelligence and machine learning. With implementations in any new emerging technology there is no secret hidden to researchers and scientists. Here you can find an overview of the main Java machine learning frameworks and express how good it is to get started without the wheel reinvention and algorithm creation from the basic.

Here are few simpler things to highlight 3 projects for helping you get started:

1) Deeplelearning4J (DL4J)- Distributed and commercial-grade, open source, deep learning library for JVM.

2) BID Data Project- For enabling fast collection of patterns, large-scale machine learning and data mining.

3) Neuroph- Object-oriented neural network

1) DL4J- Deep Learning

For assisting you a tool called DL4J is made in the process of deeply configuring neural networks and are made of multiple layers. A deep sense of learning brings into the JVM along with fast prototyping and customization with target on more convention than configuration. People who are already needing the theory for creating and use neural networks that are deep and for them this tool is used. For solving specific problems involving lots of amounts of data and neutral net property customization. Java is the programming language used for writing it and therefore it is compatible with any JVM language like Clojure, Scala or Kotlin and it combines with Spark and Hadoop.

5 Factors Why Java Professionals Should Know Hadoop

2) BID Data Project

People who are dealing with large amounts of data and are sensitive towards performance, the project called BID Data is made for such people. A collection of hardware, design patterns, and software for enabling fast and large-scale data mining. The BIDMach is the first library for holding records for various common machine learning problems on single nodes or clusters. It can be used to manage data sources, distribute and optimize data over CPUs or GPUS.

There are of famous machine learning algorithms and the team is focusing on development of distributed Deep Learning networks, graph algorithms and other models.

4 pros and 4 cons of Java

3) Neuroph

It is a lightweight Java framework for developing common neural network architectures. A Java library is offered by the framework along with a GUI tool and can use it for creating and training your own networks in neural in Java programs.

An open source Java library is present in it along with a small basic class with respect to essential neural network concepts. If you are at the start of your career it is good to go with neural networks. Join the Java courses in Pune to make your career in this field.

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Session Tracking Methods In Java

What is a Session?

A conversation between the client and the server is considered a session. A series of continuous request and response are present in a conversation. For more information join the Java developer institute in Pune to make your career in this field.

Reason for a session to be maintained

If you come across lots of request and response from the same client to a server, the server is unaware about the identity of the client as HTTP is a stateless protocol. Therefore a certain session tracking is to be made. Let us look at the solution: while making a request the client should introduce itself by offering unique identifier every time. This method can be achieved using five different methodologies:

  1. User authorization
  2. Hidden fields
  3. URL rewriting
  4. Cookies
  5. Session tracking API

For session tracking in server-side technologies, the first four methods are traditionally used. With the help of underlying technology, the session tracking API method is offered.

Read More:  Java Technologies For Web Applications

1) User Authorization :

For using the web application, users can be authorized in various ways. Username and Password is offered to the user and that is the basic concept for logging into the application. Depending on this the user can be identified and the maintenance of the session can be done.

2) Hidden fields :

<INPUT TYPE=”hidden” NAME=”technology” VALUE=”servlet”>

In the webpages the hidden fields like the above can be inserted and for the purpose of session tracking the information is sent to the server. There is no need for special configuration from the server browser for this type and is readily available for session tracking.

3) URL Rewriting :

Original URL: http://server:port/servlet/ServletName
Rewritten URL:
http://server:port/servlet/ServletName?sessionid=7456

At the time of request, the url is appended with the additional parameter. Session id or sometimes the user id is the general added additional parameter. For tracking the session it will suffice. The parameter can be kept under track like chain link till there is a complete conversation and there should be surety about the non clashing parameters with other application parameters.

Read More:  Java Standard Edition For Business Solution

4) Cookies :

For session tracking cookies are the commonly used technology. Key value pair of information is the cookie and is sent by the server to the browser. The browser saves it in the client computer space. The cookies is sent along with the request sent to the server during the time of the browser. The cookie can be used for identifying the client by the server.

Create cookie using this snippet code:

Cookie cookie = new Cookie(“userID”, “7456”);
res.addCookie(cookie);

5) Session tracking API :

On the first four methods, Session tracking API is built. For helping the developer to reduce the overhead session tracking. Underlying technology offers this type of session tracking. This is considered as the best among other methods and there is no need for the user for explicit usage of java servlets. Join the best java training classes in Pune.

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Difference Between StringBuilder And StringBuffer In Java

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Two significant classes in Java representing mutable String are StringBuffer and StringBuilder that is the string object whose value can be changed. In Java, String is immutable, if there is any modification or operation done on String object for instance: changing it to upper or lower case, adding character, deleting character or in a new String object, substring all the result. Lots of stress can be applied on the Garbage collector because of this if there is a generation of lots of throws away String instances from your application. Initially String Buffer class and later on Stringbuilder were presented by Java developer. Here in this article you will find the difference between Stringbuffer and Stringbuilder:
1) In Java StringBuffer is existing and in StringBuilder was included in Java 5.

2) Both StringBuilder and StringBuffer provides mutable String meaning add/remove character, substring without making new objects.

3) By calling toString () method, the StringBuffer can be converted into String.

4) equals() and hashcode() method is not over-rided by StringBuffer and StringBuilder as they are mutable and not intended to use a hash key based collection classes eg: Hashtable, Hashset, and HashMap.

Significance Of Abstract Methods and Classes In Java

5) All the methods modifying internal data of StringBuffer is synchronized for instance insert (), append (), and delete(). On the other hand Stringbuilder is not synchronized.

6) StringBuffer is considered thread safe because of synchronization

e.g: without compromising internal data structure multiple thread can call its method but it is not synchronized hence not thread safe.

7) StringBuilder is faster than StringBuffer because it is synchronized. Speed is considered as another side effect of synchronization.

8) The predefined length of StringBuffer is 16 characters. You need to provide the size if you know that the size would be less or more than 16 for avoiding wastage of memory and spending time during resize.
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Java Training Teaches JEE Application Session Beans

Learn more about Session beans by undertaking Java training.

The representation of core business service objects called Session beans combines business logic in an enterprise application. In a standalone EJB container the Java component is executed or JEE application server container. Session beans business logic from a client interface are usually used to model tasks that get user information. For maintaining the state of conversation with respect to client application the enterprise logic in a session bean processes it. The needed services of the background sessions are provided by the EJB container. A session bean requires Java annotation designation via XML metadata on the basis of the type of service. Sessions beans are used with some key information in an enterprise application.

Read More: JavaBeans vs Spring beans vs POJOs

Important points

A user interface is offered by a rich client front-end application in a common three-tier architecture for entering data by the end user, like information for creating new account, product purchase, credit card statement etc. and then a trigger is generated by offering the information. In the EJB container a connection is established to the existing session bean. Remote Method Invocation (RMI) is the technique used for helping to make the communication. The method is invocated with the help of RMI where appropriate business handling logic is associated with the client request. The data validation is done after the processing of the request by session bean with the back-end database server linked with the enterprise application. The client receives the appropriate response finally by the session bean in the form of acknowledgement message or data collection object.

JavaFx, Swing, or a simple POJO is used for developing the client application or with a console interaction and simple POJO. It is said that they are run a desktop and offer only a user interface. A rich interface is offered by the rich client that offers the end user a different experience. The event triggered by processing responsibility with the triggered event by the client interface is controlled by the session beans.

Types of Session Beans

Session beans are categorized into three parts: stateful, stateless, and singleton

Stateful: Between the server and the client application a conversational state information is maintained in this type of session. This type of bean is got as an instance from the EJB client and this is what it means. On the instance variables the EJB container will remain their values in method calls that are successive. By persisting information during passive state the EJB container offers the service. When it becomes active, the state information is retrieved. Because of this persistence act there are complex life cycle events in comparison to stateless session beans.

Read more:  5 Points to Note in EJB and Java Beans

Stateless: You will find simpler session beans because they do not need saving any state of conversation on behalf of the client.

Singleton: Only once per application this type of bean is created. Thus the state information is maintained between the invocations of client throughout the duration of the living application. It is created only once per application.

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