Core Java

Define constructors and list its types.

A Constructor referred to in Java is a special type of method that is utilized to initialize the object. A Java constructor is typically invoked at the time of object creation. It builds the values meaning that it generates data for the object which is exactly why it is known as a constructor.

There are two fundamental rules for the creation of Java constructors. The first states that the constructor name must be same as the class name. The second states the constructor should not have an explicit return type.

There are two types of Java Constructors:

Differentiate heap and stack memory.

Irrespective of where the object is created in the code, (for instance as a local variable or class variable), they are always created within heap space in Java. But the differences between them both are given below:

Explain Lambda expressions in JAVA

Java Lambda expressions are new and essential features of Java which were included in Java SE 8. It offers a concise and clear-cut manner to represent a single method interface utilizing an expression. This proves to be highly useful in the collection library. It helps in the iteration, filtering, and extraction of data from the collection library. Pre-lambda expressions, something known as the anonymous inner class used to be the only choice for such implementation. Since Java lambda expression is handled as a function, the compiler will not create a .class file. A Lambda expression offers implementation of what is known as a Functional interface, which has only a single abstract method.

Use of Lambda Expression facilitates implementation of the Functional interface and minimizes the amount of actual coding.

Define synchronization and discuss why we need synchronization in JAVA?

Synchronization in Java can be defined as the capability to control the access of multiple threads to any shared resource

This is highly useful when it is required to allow a single thread to access the shared resource. It is used to avoid and minimize thread interference and to even prevent consistency problems

There are two types of synchronization:

1. Process Synchronization
2. Thread Synchronization

With reference to thread synchronization, when two or more threads are started within a program, there may be a possibility of multiple threads accessing the same resource. This may, in turn, generate unpredictable results because of concurrency issues.

Therefore, there is a need to harmonize the action of multiple threads making sure that only a single thread would be able to access the resource at any given point in time. The implementation of the same is carried out using a concept named as monitors wherein every object in Java is associated with a monitor and a thread can lock or unlock. And only one thread will be able to hold a lock on a monitor at one time. Threads can be created and their tasks synchronized easily using what is known as synchronized blocks.

Discuss Multitasking and its types.

The process involving the simultaneous execution of multiple tasks is known as multitasking. This is used to utilize the CPU in the most efficient way possible.

Multitasking can be achieved in two ways using:

Why Java is considered as an important programming language?

First Designed and released by Sun Microsystems Corporation in 1995, Java remains to be the most ubiquitous programming language without which a majority of applications and websites online today will not work. And this trend is replenished by the daily influx of newly created apps and web interfaces. Anything from game consoles to data centers and mobile phones uses Java (Since Android OS runs on a Java Language Environment).

Java is much easier than C++ which makes it the top pick for Fortune 500 companies to develop website backend systems and desktop apps.

Java is Beginner Friendly and is relatively simple to use. It is also statically-typed, meaning errors have to be checked before compiling, thus making the Java codebase easier to maintain. Being statically typed, it is faster than its dynamically typed components. Just in Time compilers boost Java performance enabling optimization in real time. Finally the massive online community of Java Developers and programmers from a helpful network of programmers for any issues that may crop up.

What is the future of Java?

It is an established fact that Java has been the biggest development in the IT domain which swept across the globe post the creation of C++. It currently serves as the backbone of countless products and services which have taken the world by storm.

The future of Java has in its sights, integration with lean and agile practices and thinking to power the Java community towards ground-breaking innovations, delivering quality systems addressing business needs. Since the Java ecosystem is self-sustaining, right from mobility to middleware, it will impact everything on a grand scale with trends picking up in the future.

Facebook has announced its plans to work on its Reactive Native, JavaScript framework, and ruling out a return to HTML 5. Also, Java is rooted deeply in online open-source community, which is always an indicator of sustained future growth. Finally, since Java is on almost every device imaginable on the planet, the future of Java looks very promising with infinite scope for growth and expansion.

What are the different editions of Java?

1. Java Standard Edition is the conventional version architected for general computing. This is an Object-Oriented language which is statically typed and bytecode-compiled and runs on a completely automatic garbage collection.
2. Java Enterprise Edition- this may not qualify as a different language, still, there are Interface specifications architected to generate software that runs inside an Application Server implementation. The primary difference here is that it is architected for deployment to Application Server that is compatible with Enterprise Edition Interfaces
3. Java Micro Edition is Java designed to run on Mobile devices. It should be noted that this is not the same as Android. Java ME is architected to deal with mobile hardware better than Java SE.
4. Java Card is a highly portable version of Java for lower end devices such as Smart ATM cards which in fact have Java on them
5. JavaFX is a framework architected to construct feature rich Internet Client GUI Applications.

List the types of applications that run on Java.

Java currently runs on well beyond 3 billion devices and the types of application that run on Java are as given below:

1. Desktop GUI Applications
   Methods such as Abstract Windowing Toolkit (AWT), Java FX and Swing in Java allow GUI development for Desktop applications
2. Mobile Applications
   The cross-platform capability of Java, Micro Edition, also known as Java ME or J2ME  is known to run on innumerable Java supported devices which include smartphones and feature phones. Also, Android apps are scripted in Java.
3. Embedded Systems
   Embedded Java technologies are seen in various devices such as televisions, utility meters, blue-ray disk players and SIM cards.
4. Web Applications
   Through the use of Struts, JSPs or Servlets, Java offers support for web applications worldwide.
5. Web Servers and Application Servers
   In addition to web applications, it also provides support for web servers and application servers.
6. Enterprise Applications:
   Enterprise software including web-services and network applications are catered to by Java using Java Enterprise Edition offering API and runtime environments.
7. Scientific Applications
   Most Software developers use Java for creating applications including scientific and mathematical calculations, for example- MATLAB

Discuss the salary trend for Java professionals.

Enterprise back-end and Android Mobile application development have seen their respective markets being led by Java for a long time now. Oracle has stated a nine million strong Java developer workforce across the globe who have stuck with Java for reason of reliability and compatibility

According to the leading global job portal indeed.com, the median Salary for a Java developer in the US is $102,043 per year as on April 28th, 2017. This is almost 50% higher than the average salary of an IT professional in the same geography.

The online research company has gone on to say that currently, the average salary earned by a software engineer in the UK is around $63,500 which is a significant percentage higher than the median salary drawn by an IT professional in the UK

Database Administrators in Java are able to hit similar salary targets through a certification and sometimes even without.

What are the Prerequisites of Core Java?

What are the system requirements to attend the live sessions?

1. Processor I3 with 4GB RAM, OS can be 32 or 64 bit (Laptop/Desktop)
2. Internet connection with Min 1 MBPS speed
3. Good quality headset
4. Power back up
5. You can also log in through your Android mobile phone/ Tablet with 4G internet connectivity

What if the trainee miss any session?"

The trainee can watch the recorded video of all the sessions in the LMS or Trainee can attend the missed session in the upcoming batches.

What do the trainee get from the LMS?"

The trainee will have the access to Recorded sessions, Assignments, Quizzes, Case Studies, few course documents posted by trainers, Placement related docs etc.

What is the validity of the LMS access? What if the LMS access is expired"

The trainee will get 1-year access to the LMS. You can contact our support team to extend the validity of the LMS.[/accordion]

Will the trainee get any project to work on with Core Java?

Yes, of course! The trainee will get the project at the end of the course; you need to submit a project. Our trainers will assist you to complete the project

How are the practicals done?

The trainee will get step by step assistance from our expert trainers during the practical sessions, post live sessions, you can practice at your end and submit your queries if any to our support team support@corpconsult.co for further assistance.

What are the types of training we offer?

1. WBLT- Web-based live Training
2. WBVT- Web-based Video Training
3. One on One live training
4. Self-paced training
5. In class training

What are the benefits of online training ?

1. Flexible location
2. Flexible schedule
3. Travel free
4. Time saving
5. Cost saving
6. LMS access
7. You will never miss a class
8. Two-way interactive
9. Fast learning
10. Trainer support for 1 year

Who are our Trainers?

Our trainers are industry experts having 10 to 15 years of industry experience and 3-4 years of training experience. Most of the trainers are working professionals who teach the real time scenarios which will help the students to learn the courses in an effective manner.

Will the trainee get the certification post the course completion?

Yes, Trainee will get the participation certificate from CorpConsult upon successfully completing the course.

What if the trainee has more queries and need assistance?

The trainee can drop an email to support@corpconsult.co an automatic ticket will get generated. Our support team works 24/7 to assist you with all your queries.