Monthly Archives: September 2017

Frequently Asked JDBC Interview Questions And Answers

For getting to know about various powerful features of Java, you need to clear your basics of JDBC API. With respect to any Java interview, JDBC questions are always available. So please see the below sections which have frequently asked JDBC interview questions and answers for freshers along with experienced Java developers.

1) What is JDBC?

Java Database Connectivity is the full-form for JDBC and it is a standard Java API for relational database communication. For connecting to the database JDBC API has interfaces connection and also performs operations like query and update. For connecting with the database, JDBC API uses JDBC drivers.

Frequently Asked Questions And Answers In Java 8 Default Methods

2) Explain JDBC Driver and its types?

There are classes and interfaces for enabling applications of Java in JDBC driver for interacting with a database. Here are 4 types of JDBC drivers:

Type 1 driver or JDBC-ODBC driver- Native ODBC driver is used by JDBC-ODBC bridge driver for connecting to the database. It turns JDBC method calls into the ODBC function calls.

Type 2 driver or Native-API, partly Java driver- The client-side libraries of the Native API driver is used by the database libraries. The JDBC calls are converted by the driver into database calls with the help of using native API provided by the database. It is a database related driver and once you change from one database to another there is a need to change this driver.

Type 3 driver or Network Protocol pure Java driver- Server sider middleware is used by the Network Protocol driver for converting JDBC calls into the vendor-specific database protocol.

Type 4 driver or Native-protocol, pure Java driver- In today’s world, this is the most frequently used driver. The JDBC calls are converted by the driver directly into database protocols which are specific to a vendor. There are various protocols which are proprietary and therefore the there are database vendors that have a primary source for this driver type.

Read Also:- Do you know about JDBC?

3) Explain the fastest JDBC driver type?

Native Protocol or Type driver is the pure form of Java driver and is considered the fastest driver as it converts into specific vendor protocol from JDBC calls which has direct contact with the database.

4) Explain the types of Statements in JDBC

There are 3 types of JDBC statements:

Statement- For the purpose of executing a static SQL statement during runtime this is used mostly. Using Connection.createStatement() an object of statement class can be created.

Prepared Statement- For the purpose of executing same SQL statement lots of times this statement is used. In a PreparedStatement object SQL statement is precompiled and stored in a Prepared statement object. For executing this statement various times, this object is widely used.

Callable Statement- For executing SQL stored procedures or functions this statement is used and a CallableStatement object class is created using Connection.prepareCall() method.

How to Use the JavaBean API Library

5) Difference between Preparedstatement and Callablestatement

For executing a precompiled SQL statement multiple times, a Prepared statement is used. For executing SQL stored procedures, Callable Statement is used. There are various functions and cursors too in the process of Callable Statement executed and it extends the Prepared statement Interface.

Follow the above JDBC interview questions and answers to be a successful Java developer

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Frequently Asked Questions And Answers In Java 8 Default Methods

There are lots of candidates who are searching for jobs especially in the field of Java and here are few frequently asked Java questions on Java 8 Default Methods. Just keep these things in mind and prepare well before the interview:

1) Is it possible to make Default method static in Java?

No, it is not possible to do so as there is no possibility of making default static methods in Java. If you state default and static method together there will an error popped up saying an illegal combination of modifiers static and default, especially from the compiler.

Read More : Significance Of Abstract Methods and Classes In Java

2) More than one Default methods are present in an interface explain

More than one default methods are possible to be contained in a Java interface. But, it is very much mandatory to find reasons for including multiple default methods on an interface as default implies to one behavior, not multiple behaviors.

3) Is there a possibility to override equals(), toString(), hashcode() from Object Class?

There is no possibility that can override default method from java.lang.object for explaining to override to equals(), Strings() or hashcode() as the default mode in an interface on Java 8 for throwing an error during the compile time as default method toString in parser interface overriding as a member of java.lang.

Read More :  Top 13 Oops Java Interview Questions

4) Inside a class in Java is it possible to declare default methods?

It is not possible but just considers why there is a need for default methods in Java classes, as there is no interface implementation, there is no subclasses implementation needed for a new method included inside a Java class. A change in its subclass is not required if a class needs to evolve.

5) Is there a possibility for default method abstraction in Java?

There is no need to think much about answering this question as it the same when compared to a class be final and abstract at the same time or is it possible to declare a Java method final and abstract? There is an invention in default methods for providing a concrete method inside interface. Just because adding a new method inside interface will break its implementation as they are abstract inherently needing all the clients for implementation.

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Why Is Java Considered A Secured Language?

When compared to other programming languages you will come to know that why is Java programming language secure and that is what this blog is all about. With respect to Java’s fame security is the prime factor to be looked at.

Why is Java Secure Language?

1) Own Memory Management

The memory management mechanism is unique and is owned by Java. There is no need for manual intervention for garbage collection and everything is handled automatically. There is no need for a headache to free the memories. It drastically reduces the programmer overhead. Therefore the programmer’s hand must be free from memory management. Relieving the memory in Java is the job of JVM.

Java Programming Language and It’s Security Level

2) No Pointers

There is no support for the pointers concept in Java. Some of the arbitrary memory locations can be addressed with the help of pointers for doing read and write operations which are unauthorized. This does not serve the purpose of being secured. That is why users do not use the concept of pointers.

3) Access Specific Keywords

There is another benefit for Java security and it is nothing but having an access specific keyword. If access to a method is what programmer wants to give to other functions then the public keyword must be used. If he/she wants to hide the information then private keywords must be used. Access security issues can be controlled by the programmer like the above-mentioned line. For avoiding data to be overridden the programs can use the final keyword.

Java: The Most Secure Programming Language?

4) Compile Time Checking

It is more secure because of the ability of compile-time checking. For instance, if a method which is unauthorized and wanting to access a variable which private then the JVM will catch the error during compile time. For avoiding system crash JVM catches lots of errors which is actually a great thing. Two different results are produced with the help of two different Java compilers. Memory locations cannot be accessed other than the array as it checks array bounds carefully.

5) Exception Handling

This concept present in Java actually means that it can catch the results which are unexpected through exception handling and report the error to the programmer. Until the rectification of the error by the programmer this concept will not allow us to run the code. Thereby proving Java’s security.

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A Brief Introduction To Spring Framework

A lightweight Inversion of Control Container is called Spring and it is also considered as AOP framework. The testing and deployment of Java enterprise applications are made easier with the help of Spring. There are owned MVC components in the Spring that is used in MVC Web-based applications. For various Java development applications there are supports provided and for listing a few Web Services, Hibernate, JSF, Struts, JPA9 Java Persistence Architecture API) and AJAX and other frameworks.

Light-weight container

J2EE containers are very old when compared to Spring container which is independent JVM ( no server dependencies that are present for running the container). EJB, Servlet, and JSP are very heavy containers because of their reliability on underlying execution and operating system. Because of the ability of Spring framework to run on command prompt without any dependency on other containers, it is called as lightweight.

Read More :  Access MySQL Data By Spring Boot and Spring Data

1) Resource Management Service

Removing and Creating objects: For creating a single object with any number, Spring container is used with respect to lots of client requests and this kind of objects are known as Singleton. There are also unique objects to be created for each and every client request. Prototype objects are such kind of objects.

2) Life Cycle Services

LS: After object creation, LS means one method calls other object creation and before destruction one method is invoked before. In old J2EE such methods are predefined containers like init() and destroy () Servlet methods. For creating user-defined lifecycle methods Spring permits it and it can be called in place of predefined lifecycle methods. In spring configuration file, we require to mention them separately.

Reason behind Spring container called as IOC containers

Other than providing standard container services the spring container has dependency injection additionally. It is called as IOC container because of dependency injection. In the first program, the meaning of dependency injection and its types will be known.

Read More : Java’s Spring Framework gets a new competitor

Spring 3.0 Framework Features :

1. Java 5 Support: With JDK 5, Spring 3.0 core API is compatible and it is the same with higher versions too. Support for annotation is offered by Spring 3.0. Even with EE5 Spring 3.0 is compatible.

2. Expression language- Spring Expression Language

(SpEL): Expression language Spring 3.0 can be used by the Programmers. While defining XML, spring EL is useful and the same applies for Annotation based beans.

3. Comprehensive REST Webservices Support: REST Web services are supported by Spring 3.0. The acronym REST stands for State Transfer Representation which actually means that each unique URL is represented by some object.

4. Java EE 6 Support: There are various features supported by Spring 3.0 framework of EE6 like JPA 2.0 ( Java Persistence API) and JSF 2.0.

5. Annotation-based formatting support: Annotation-based formatting support is also available with the Spring.

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5 Java Anomaly Detection Tools You Need To Know

There are lots of reasons due to which application failures happen and for each possible sources there are tools for errors like log management tools, performance monitoring solutions, error trackers and so on that help in addressing each of the possible sources. There are lots of noise in the data that these tools collect. How to understand the importance of a data? Now you can see the various tools for anomaly detection in java and predicting the anomalies.

1) X-Pack

To the ELK Stack X-Pack is an extension and that provides anomaly detection. For helping the users understand the nature of their logs it uses algorithms to check or detect their unusual activity. With respect to its data source, the package relies on logs and it lets the users to know how metrics are specific and their effect with the product and how the users get to know about it.

Key features:

Inside the Elasticsearch of log data and metrics anomalies are detected.

Security issues can be identified by networks monitoring activity and user behavior.

Anomaly log events are identified.

2) Loom Systems

In logs and metrics, an analytics platform for anomaly detection is made with the provision of Loom Systems. In logs, it detects anomalies and also offers operational analytics.

Key Features:

Analysis and automated log parsing from various applications

Resolutions recommended- Relying on the company’s solution database.

Anomaly detection and business operation.

List Of Rules Engines In Java

3) OverOps

In production, OverOps says you when, why and where the code breaks in production. The complete source code is the only tool which offers variable state across various call stack for various errors and let you detect proactively at the time new errors are given the application.

Key features:

Variable state and code into full visibility state for automatic reproduction of errors.

Critical errors and new proactive detection by code release

Log files with no Java agent that doesn’t have any reliability.

Any StatsD complaint tool working for custom anomaly detection visualization.

There are no configuration and code changes for installing in 5 minutes through On-premises, Hybrid, SaaS.

A dark theme and a badass dashboard.

How To Begin With Java Machine Learning?

4) Coralogix

In log data the Coralogix clusters and gets to know about similarities. Common flows and tools focus along with detecting the log messages that are attached to them, and when there is no expected outcome with the action then it will be alarming.

Key Features:

Loggregation- Summarize and bundle the logs that have similar patterns.

Flow anomaly- detection of anomalies and identification of connected actions inside them.

Version based anomalies- Anomalies specified that only with the presence of a new version of user products was deployed.

5) Anodot

With relevant analytics for the users Anodot offers an anomaly detection system with the relevant analytics for the users. In databases of any type their target is on detecting anomalies along with anomalies identification in business related data.

Key features:

Grouping and behavioral correlation of similar logs

For offering anomaly detection business data anomalies is detected for marketing campaigns, clicks and performance indicators.

Alerts handling- By grouping similar anomalies into one alert it reduces the noise.

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Best Java Training Course

Define Java :

One of the frequently and commonly used programming languages is Java and it enables the programmers for writing codes with the most powerful instruction sets provided by Oracle Inc. It is considered as one of the most power codes using instruction sets provided by Oracle Inc. The syntax is the set of rules that Java uses. There are higher levels of instructions which are translated into machine codes after the program has been written, by JVM that computers can comprehend and execute.

Java training course is more than enough for you to make your career with these opportunities.

Career Opportunities:

This is how your career would start:

  • Java Video Game Programmer

  • Java Web Developer

  • Java Webmaster

  • Java Developer

  • Web Software Engineer

  • Big Data Developer

  • Cloud Computing

Read More  :  List Of Rules Engines In Java

Gathering knowledge, skills, and competencies refer to training. There are unique goals of enhancing one’s capacity, performance, and capability. It is a platform independent, famous robust, secure, multithreading relying on the higher level programming language. It is secure, robust, and famous, platform independent and a higher level programming language.

A knowledge of Java is more than enough for the candidate to become a professional as a Java developer. You can find lots of frameworks available in which the candidate can enroll with Struct, Hibernate, web services, Springs, etc. Other than that the employee can make their profession as Android developer, big data developer, software tester, cloud computing, database administrator.

There are wide ranges of career opportunities for the candidates like Java developer ( software developer), big data developer (Hadoop), cloud computing (Salesforce), a database administrator ( Oracle MySQL), software tester (Selenium), etc. Thus a Java course would be helpful for the candidate to become a professional in this field.

Frameworks In Java :

1. Spring Framework :

An open source Java application framework called as Spring makes use of inversion of control (IOC) container for the Java platform. With the help of any Java application, the same framework can be used lots of extensions are available for constructing web applications above the Java EE platform. It is very famous in the Java community as an alternative to, a replacement for, or an addition to the EJB model. You can find spring framework with inversion of control (IOC), Aspect oriented programming (AOP), Transaction Management (TM), Model View Controller (MVC).

Read More :  Get To Know About The Best Java Frameworks Of 2017

2. Hibernate Framework :

An open-source ORM (object relational mapping) called Hibernate for the Java programming language is the main framework of JDBC. The mapping of an object-oriented domain model is offered by this framework to a relational database. The shortcomings and builds of the better source is overcome by Hibernate. This framework feature is Java classes mapping to database tables and Java types to SQL.

3. Struct Framework :

For developing Java based web applications, Strut is the most popular framework used. Apache Software Foundation established the Struts by the open source project. Depending on Model View Controller (MVC) architecture, the Struts Framework is based. An action class is invoked by the controller at the reception of the request. The model is consulted by the action class to examine or update the state of the application.

For more information join the Java training to make your career in this field.

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Get To Know About The Best Java Frameworks Of 2017

Most of the Java web developers have several Java Web Frameworks available for them. Here you can see the best and the latest Java Web Frameworks for 2017. What do you understand by web application framework?

A web framework or web application framework (WAF) is a software framework which is significant for the development of various web applications like web resources, web APIs, and web services. During the process of web development the daily activities can be alleviated by web framework.

Spring MVC (Model View Controller)

As a layered J2EE/ Java framework, Spring MVC is a combination of specially applied sciences. For a broad range of perception it is quite appropriate. Lots of new innovations and changes were welcomed by Spring MVC especially after its design and expansion. For the purpose of configuration and development of web applications it offers a useful toolkit for development. There are lots of security projects that you can use it for. Among other programmers spring is very much famous for its well developed ecosystem. There are lots of add-ons like SOAP services, REST APIs, and security authentication.

JSF -(JavaServer Faces)

Java’s net utility framework, JSF also has Oracle support. Although it might not be the best framework for Java development, it has easier ways of using because of Oracle supplied documentation. There is no extra dependency on JSF if you need EE environment in Java. A wonderful magic wand is none other than tools and rich libraries and that may back you up to the application’s complexity. Server pages of Java is used by JSF and it can back up various technologies of Facelets and XUL.

 Top 4 Java Web Frameworks Built For Scalability

Struts

Best Java Web Frameworks for 2017 are made by Struts and it is a framework to develop the web application base. For co-operating to solve the problems of a unique type this framework is used and it is a set of interfaces and classes. MVC pattern is the basis of this function. A new framework for numerous Java applications and is equipped by Struts 2. The main reason behind it is the combined effort from various communities support. It can also create dynamic responses.

Hibernate

Of course Hibernate ORM cant be ignored while talking about the best Java web frameworks. An important object-relation mapping device for programming language in Java. For a domain model (object-oriented), it provides a mapping framework to one relational database. The object relational impedance can be solved by Hibernate by replacing persistent and direct database.

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Explain ETL Tools In Java

For the process of performing Extraction, Transformation, and Loading, ETL is well known. Lots of sources, and formats have data which are extracted in the process and it converts it into a standard structure, and inputs into a database, web service, machine learning, and visualization. There are lots of shapes that ETL Tools come in like for instance, some run on your desktop or on-premise servers and others run as Saas in the cloud.

Join the java training in pune to know more about this field

1) JASPERSOFT ETL :

Normally used for creating data warehouses from transactional data; Jaspersoft is an open source ETL tool for permitting integration of relational and non-relational data sources. A business modeler for a non-technical view is also included for view of the information workflow and a job designer for editing and displaying ETL steps. There are features like output sources databases, XML, web services, CRM, native connectivity to ERP and Salesforce applications.

2) Data Pipeline :

An ETL engine used for plugging into your software for loading, migrating data, and processing on the JVM is called Data Pipeline. A single API is used or modeled after the Java I/O classes for handling data in a variety of structures and formats. For processing both streaming and batch data with same pipelines. For handling huge amount of data with a less over head and still able to do using multi threading.

Read More :  Understanding JVM Internals.

3) Scriptella ETL :

Written in Java, Scriptella is an open source ETL Tool. Although it has a humble feature set, it permits for data transformations without XML and offers the ability for scripts execution in various different languages along with SQL, Velocity, JavaScript and JEXL.

4) KETL :

Built on a multi-threaded XML architecture, KETL is a production ready tool and is package independent notification tool. Java based data integration tool, data management, security are some of the main features of KETL.

5) Apatar ETL :

Relying on Java, Apatar is an open source Etl. Single-interface project integration, bi-directional integration, platform independence, non developers are some of the feature set it includes. There are wide range of applications and data sources like MS SQL, Oracle, JDBC and it has the ability to work with these.

Read More : What are the Latest Technology in Java API?

6) Apache Crunch :

The process of writing, testing, and running is made easy and the Apache Crunch is an open source Java API. The tasks are in rapid speed and it runs on top of Hadoop MapReduce. Data joining and integration are some of the instances of these tasks. Although its design doesnt fit into a relational model like serialized object formats, and series.

7) Cascading :

For data processing, cascading is an open source Java library. For solving business problems, API offers you a wide range of capabilities. A data integration API is offered by the tool and you can construct your own taps and schemes. Reading and Writing of data can be supported by Cascading the wide range of external sources. 

8) Apache Oozie :

For scheduling Apache Hadoop Jobs, a java web application called Apachie Oozie is used. A scalable and a reliable tool for performing on a single logical unit by integrating sequentially with multiple jobs. Job scheduling is also supported by Apache Oozie for specific systems like shell scripts and Java programs.

Read More :  Java API copyright-ability is questioned

9) Data Sift :

A powerful data validation tool and transformation framework is nothing but Datasift. With the purpose of targeting enterprise software development. The ability to customize any feature with respect to your need is the key feature over here.

10) Talend Open Studio for Data Integration :

Offering a wide range of data integration solutions, Talend is an open source tool. A drag and drop feature set. For connecting large volume of connector application help in integrating with database, web services, and mainframes.

Java Jobs in Pune are always available for you to become a professional.

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List Of Rules Engines In Java

Here are few list of rules in Java that you need to know and for more details join the Java programming course in Pune to make your career in this field.

1) Overview

Here we are going to talk through some of the most famous rule engines for Java. Inside mission-critical applications, the maintenance process of business logic got too tough. For easing the development the business rules can be used and maintenance by splitting business logic from the source code.

2) Drools

Business Rules Management System (BRMS) or Drools solution can combine with jBPM, a Business Process Management tool for standardization of process, tasks, events activities, etc. If you want to know more about Introduction to Drools then you can look in in the integration with Spring topic.

Java Spring Framework

3) OpenL Tablets

A business rules management system also called as OpenL Tablets is a business rule engine relying on the Excel decision table. There is a familiarity to business users with respect to the business users and it connects the gap between business users and developers.

4) Easy Rules

Offering a lightweight and POJO based framework for defining business is Easy Rules with Simple Java. From the primitive ones and using the pattern that is composite and all these can be done from the creation of complex rules. It has a contrast framework to the most traditional rules engines, and it has no touch with the XML files or any Domain Specific Language. For the developers the Easy Rules can be handy to create and maintain applications. There is a use of annotation-based classes and methods for business logic injection into the application.

How To Begin With Java Machine Learning?

5) RuleBook

For leveraging Java 8 lambdas, Rulebook is a Java framework and for defining the link of Responsibility pattern using simple BDD approach. There are some RuleBook similar to many rule engines. For reading data by the rules which is supplied to rules by data of one type, there are rule books with decisions.

Join the best Java classes in Pune to make your career in this field.

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