Core Java Tutorial

Core Java Tutorial from svr technologies by 07+ years experienced faculty. 30+ Tutorial videos & 100+ interview questions and answers.

Core Java Tutorial Videos

Q. What is Core Java?

Core Java is Sun’s period, used to consult Java SE, the usual edition and a hard and fast of related technology, like the Java VM, CORBA, et cetera. This is mainly to distinguish from, say, Java ME or Java EE. Also, observe that they may be talking approximately a set of libraries in place of the programming language.

Application of Java and Core Java

Core Java refers to the Java Standard Edition (Java SE) that’s the simple basics of the Java platform and is used for the improvement of agency stage packages for each computer and server.

Java can Categories into Three elements:

Java SE (Core Java): Java SE is used for Developing Standalone software Or System Software that Runs on System simplest. In Java SE, you could Learn the basics of Java Like Inheritance, Polymorphism, Strings and so forth.
Java EE: Java EE is used for developing Web Applications that Run with the assist of Web Browser. In Java EE you could Learn the Advance topics Like Servlet, Java Server Pages(JSP), Enterprise Java Beans(EJB) and many others.

Java ME: Java ME is used for Developing Mobile Application That Run on The Mobile Phones.

In The Java ME, you Learn about Android App Development.

Uses Of Core Java: Java is a programming language that helps you write software programs for plenty of structures. Whether you are writing a GUI software with a computer interface or developing server-side software, or a cell utility the use of Android, getting to know Java will serve you properly. Here are some center Java standards to help you get started

Features of CORE JAVA

We are thinking about Core Java as an at ease, object-orientated, high-level programming language. It has some notable features for which it becomes the most popular programming language.

Java is straightforward if you have prior expertise in C or C++ language

Java is simple to examine in you know C language or C++ and fascinating additionally.

Java is secure

Java is considered a secure programming language. It gives an easy way of creating internet programs. Java is likewise secure for internet access.

We can say that Java is platform unbiased i.E., it isn’t always depending on the device architecture. Java application can run on any platform. It can be completed if there may be JVM (Java Virtual Machine).

Java is Object-Oriented

There is an idea of objects in the java. In Java, variables and methods are encapsulated in a category. We should create the object (s) of a class. By the usage of this magnificence object, we can get admission to the magnificence techniques. Generally, we can’t get admission to class methods immediately.
Java is Robust

Java encourages mistakes-free programming using being strictly typed and appearing run-time exams.

Multithreaded

Java supports multithreading programming. Java maintains stacks for special threads.

High Performance

The performance of Java could be very high. Bytecodes of Java are quite optimized and JVM can execute them quicker.

Distributed

Java is designed with an allotted environment. Java can run over the net.

Q. What is core java and advanced java?

Here you may see a function-wise contrast of middle Java vs advanced Java:

What is Core Java?
Core Java is the essential form of Java. We use it in all Java structures and technologies. Without going through center Java, it’s far not possible to increase to advanced Java.

What is Advanced Java?

Unlike center Java, advanced Java is a specialization of the core Java in some particular domains, together with database coping with, networking, and the web.

Q. What is the Core java Concept?

CORE JAVA MAIN CONCEPT:

  • OOPS concepts (Data Abstraction, Encapsulation, Inheritance, Polymorphism)
  • Basic Java constructs like loops and statistics kinds
  • String handling
  • Collection framework
  • Multithreading
  • Exception handling
  • Generics
  • Synchronization
  • Serialisation & De-serialisation
  • Concurrent collection

Q. What to do after Core Java?

To me, your query is pretty ambiguous because I don’t recognize what ‘Basic Java’ is meant to intend. I will anyway try and answer your question.

If by way of primary Java you imply conditional statements, arrays, iterations you then have understood what coding way and how things work in the programming.

If you furthermore may know the concept of inheritance, polymorphism, and lessons then there is a lot you can do in Java.

You can examine Android studio to expand easy Android programs without many troubles provided you furthermore might learn XML(for designing).

Apart from Android Development, there is a lot you can do, like making small 2D games like tic-tac-toe, rolling cube, and many others.

With all the knowledge in hand, you could make a calculator for your requirements as an Android software which can resolve your mathematical or physics issues with simply one click to confirm your solutions(just an easy idea).

Also, now that you realize the fundamentals of java and have know-how approximately programming it receives truly easy to research other programming languages without a good deal problem.

Q. How to learn core java Quickly?

Do it for a couple of programs and keep in mind that constantly try and create an application by using your self first and then use Google. I am giving underneath a list of fundamental java programs that you may do not forget for starting.

Display some text messages.

Display a list of numbers (1 to 50) every in the new line.
Find the max and min between numbers.

Swapping among two numbers the use of any method you understand.

Build a calculator software able to upload/subtract/multiply and divide the numbers.
Create two classes (awesome elegance/sub magnificence) and practice technique overloading and overriding ideas.
Create some applications concerning array e.G.
 The above packages are simple to offer you a beginner and make you recognize what I intended with the aid of primary programs. The list can be long and I will endorse you to add more gadgets to this list and create applications for them. And remember, Google is your buddy

Also, use an IDE

three) Create superior programs the use of Java APIs
Now whilst you are accomplished with making maximum of the basic applications, and most importantly, you are secure into growing such primary applications, bounce to this step. Here, I will advise you to work difficult on mastering java APIs interior java collections and java IOs. Just begin exploring diverse training and interfaces concerned with these APIs and begin growing packages for them. Please be aware which you have to usually try and find an already current API and method for doing a sure mission, and also you need to now not be developing your good judgment right here. You intend to get familiarize yourself with those APIs, so always search for a solution inside these APIs simplest.

Again I am suggesting a few primary packages you may work on first of all. Later you could consist of greater APIs and more such applications as a good deal as you can.

Taking input from the console and printing it
Reading a document from filesystem and printing it’s content in the console Creating a new record and writing a few statistics onto it.

Reading records from a URL and do some search on its content.

Store factors in a listing, and then iterate over it
Use HashMap to keep random key-price pairs and iterate over it in multiple approaches
Create a few packages for searching and sorting over series elements

The increasingly more packages you build at this step, you’ll get more and more self-assurance. As quickly as you are exact in using these APIs, leap to most crucial and difficult assignments in the next segment.

Create at the least one computing device software and one internet software

This step will come up with the confidence which is needed to stand any java interview and show your mettle in java related discussions.

The idea is straightforward. You just need to determine at least one java computer/GUI software (e.G. Laptop calculator), after which one web application (e.G. Sanatorium management). And now when you have the most simple know-how at your hand, begin exploring everything which you will want to build your two programs.

Ask help from experts (I may also do my bit to help you), your skilled buddies, colleagues and all and sundry you already know and who allow you to. Read all to be had desirable material which comes into your manner whilst searching for answers and simply gaining knowledge of the standards.

Buy some books which are related to the ideas in which you are stuck.

Do the entirety what is needed to build that application. Make them your sole objective for a few days (or weeks or even months).

Let me guarantee you that by the point you end up finishing both exercises, you will be lots more confident than ever before when it comes to java. And greater importantly, it helps you to develop a dependency on getting things done at every cost. This attitude may be very Read and take part in some properly java blogs/forums.

After your above 4 steps are completed, you will be greater of a confident guy who’s additionally able to help others like you’ve got been few months returned.

Find folks that recognize much less and assist them in solving the problems, even though it requires some quantity of time of you as properly. 

When you begin learning approximately mistakes others are making, it just opens up your mind on various instructions and improves your idea processing abilities.

In truth, the remaining step is like a limitless loop and you ought to preserve doing it whilst the time allows. You will simply respect the consequences when you will recognize how mature you have got grow to be.

Q. What is the difference between core java and advanced java?

Core Java vs Advanced Java

What is Core Java: Core Java is the essential form of Java. We use it in all Java structures and technologies. Without going through center Java, it’s far not possible to increase to advanced Java.

What is Advanced Java: Unlike center Java, advanced Java is a specialization of the core Java in some particular domains, together with database coping with, networking, and the web.

Applications Developed:
Core Java covers the essential concepts of Java programming language for growing well-known packages. Advanced Java, however, covers superior subjects about Java programming language that allows in constructing company-level programs.

Applications evolved the usage of core Java are usually standalone applications supposed to be both cross-platform or platform-specific. Simply, core Java enables in building preferred applications, including a scholar attendance control device, EMI calculator, or the conventional snake recreation.

On the contrary, packages evolved the usage of advanced Java are those who businesses use or are at an enterprise-degree. This consists of apps that run on servers i.E. Net applications.

Three. Architecture
The core Java makes use of a single-tier structure. On the flip facet, superior Java uses instances of -tier structure, which includes consumer-server architecture.

In a one-tier architecture, the data shops inside the local system or a shared force. It has all the layers, together with Business, Data Access, and Presentation.

A structure where the presentation layer or the interface layer runs on a customer at the same time as the statistics layer or the statistics shape saved on a server called -tier structure.

Java Packages

All middle Java programs have a naming conference of java.Lang.Some package. On the opposite, programs for advanced Java follows javax.Servlet.Some package.

Knowledge

Typically, there are 3 stages of Java knowledge, particularly Java, core Java, and superior Java. Hence, both center Java and advanced Java range in phrases of information.

Java:-The primary level. This is wherein one learns the way to write a Hello World program in Java and create basic Java programs.

Core Java:- It is the extent in Java talent required at least for buying a process. At this degree, one wishes to have an understanding in Java Collections, Java Exception Handling, Java Multi-threading, OOPS, Polymorphism, et cetera
Advanced Java – In addition to information of middle Java, one wishes to have a sound understanding of diverse associated applications and advanced standards, which includes JSON parsing, REST carrier advent, and XML managing

For the ones seeking to go beyond superior Java, there is an architect degree. Learning frameworks like Hibernate, Java Design Patterns, and Spring turns into obligatory at this degree.

Platform of Choice

While the Java Standard Edition (Java SE) comes underneath center Java, advanced Java encompasses the Java Enterprise Edition (Java EE).

Topics Covered

Core Java covers simple concepts and topics approximately the Java programming language. This consists of data kinds, exception managing, operators, and threading.

On the other hand, superior Java includes complicated topics and ideas that require non-Java technologies. Some brilliant examples are database connectivity, EJB, JSP, servlets, and net offerings.

Q. What is Core Java used for?

While Java is used for the improvement of applets and packages, Core Java is, in particular, used to layout application software programs for each laptop and server environments. Core Java is the maximum fundamental and the purest form of Java which sets the inspiration for different versions of the programming language.

Q. What is core java syllabus?

  • Java – What, Where and Why?
  • History and Features of Java
  • Internals of Java Program
  • Difference between JDK, JRE, and JVM
  • Internal Details of JVM
  • Variable and Data Type
  • Unicode System
  • Naming Convention

OOPS Concepts

  • Advantage of OOPs
  • Object and Class
  • Method Overloading
  • Constructor
  • static variable, method, and block
  • this keyword
  • Inheritance (IS-A)
  • Aggregation and Composition(HAS-A)
  • Method Overriding
  • Covariant Return Type
  • super keyword
  • Instance Initializer block
  • final keyword
  • Runtime Polymorphism
  • static and Dynamic binding
  • Abstract class and Interface
  • Downcasting with instanceof operator
  • Package and Access Modifiers
  • Encapsulation
  • Object class
  • Object Cloning
  • Java Array
  • strictfp keyword
  • Creating API Document

Q. How to learn core java step by step?

Do it for a couple of programs and keep in mind that constantly try and create an application by using your self first and then use Google. I am giving underneath a list of fundamental java programs that you may do not forget for starting.

  • Display some text messages: Display a list of numbers (1 to 50) every in the new line.
    Find the max and min between numbers.
  • Swapping among two numbers the use of any method you understand.
  • Build a calculator software able to upload/subtract/multiply and divide the numbers.
    Create two classes (awesome elegance/sub magnificence) and practice technique overloading and overriding ideas.
    Create some applications concerning array e.G.
     The above packages are simple to offer you a beginner and make you recognize what I intended with the aid of primary programs. The list can be long and I will endorse you to add more gadgets to this list and create applications for them. And remember, Google is your buddy
  • Also, use an IDE
  • three) Create superior programs the use of Java APIs
    Now whilst you are accomplished with making maximum of the basic applications, and most importantly, you are secure into growing such primary applications, bounce to this step. Here, I will advise you to work difficult on mastering java APIs interior java collections and java IOs. Just begin exploring diverse training and interfaces concerned with these APIs and begin growing packages for them. Please be aware which you have to usually try and find an already current API and method for doing a sure mission, and also you need to now not be developing your good judgment right here. You intend to get familiarize yourself with those APIs, so always search for a solution inside these APIs simplest.
  • Again I am suggesting a few primary packages you may work on first of all. Later you could consist of greater APIs and more such applications as a good deal as you can.
  • Taking input from the console and printing it
    Reading a document from filesystem and printing it’s content in the console Creating a new record and writing a few statistics onto it.
  • Reading records from a URL and do some search on its content.
  • Store factors in a listing, and then iterate over it
    Use HashMap to keep random key-price pairs and iterate over it in multiple approaches
    Create a few packages for searching and sorting over series elements
  • The increasingly more packages you build at this step, you’ll get more and more self-assurance. As quickly as you are exact in using these APIs, leap to most crucial and difficult assignments in the next segment.
  • Create at the least one computing device software and one internet software
  • This step will come up with the confidence which is needed to stand any java interview and show your mettle in java related discussions.
  • The idea is straightforward. You just need to determine at least one java computer/GUI software (e.G. Laptop calculator), after which one web application (e.G. Sanatorium management). And now when you have the most simple know-how at your hand, begin exploring everything which you will want to build your two programs.
  • Ask help from experts (I may also do my bit to help you), your skilled buddies, colleagues and all and sundry you already know and who allow you to. Read all to be had desirable material which comes into your manner whilst searching for answers and simply gaining knowledge of the standards.
  • Buy some books which are related to the ideas in which you are stuck.
  • Do the entirety what is needed to build that application. Make them your sole objective for a few days (or weeks or even months).
  • Let me guarantee you that by the point you end up finishing both exercises, you will be lots more confident than ever before when it comes to java. And greater importantly, it helps you to develop a dependency on getting things done at every cost. This attitude may be very Read and take part in some properly java blogs/forums.
  • After your above 4 steps are completed, you will be greater of a confident guy who’s additionally able to help others like you’ve got been few months returned.
  • Find folks that recognize much less and assist them in solving the problems, even though it requires some quantity of time of you as properly. 
  • When you begin learning approximately mistakes others are making, it just opens up your mind on various instructions and improves your idea processing abilities.
  • In truth, the remaining step is like a limitless loop and you ought to preserve doing it whilst the time allows. You will simply respect the consequences when you will recognize how mature you have got grow to be.

Q. Why is core Java important?

Java is an Object-Oriented Programming Language
Another motive, which made Java famous is that it’s an Object Oriented Programming language. Developing OOP utility is a good deal simpler, and it also allows us to preserve system modular,

Why Java is Best:

Java is one of the high-quality programming languages created ever, and I am now not announcing this due to the fact I am a passionate Java developer, but Java has proved it in the last twenty years. Two a long time is a big time for any Programming language, and Java has received strength each passing day. Though there are times, when Java improvement slows down, Java has answered nicely. Earlier with groundbreaking modifications within the form of Enum, Generics, and Autoboxing in Java 5, overall performance development with Java 6, useful programming the usage of the lambda expressions in Java eight, and Google’s choice of language for Android apps improvement maintains Java as the front-line programming language.

Many laptop science graduates often inquire from me, that is the satisfactory programming language first of all? Which language must I learn to start with? Shall I research Java? Or shall I begin with Python and so on?

If it in terms of Job opportunities, again Java outscores each person. You can get tons of Jobs possibility via learning Java programming language, you can develop core Java-primarily based server-facet application, J2EE internet and business enterprise programs, and might even pass for Android-primarily based mobile software improvement.

So in case you are not coming from C and C++ heritage, and need to analyze your first programming language, I will endorse deciding on Java.

In this article, I will proportion my list of motive, and why you need to study Java programming and why I think Java is the great programming language created ever.

Btw, when you have already made your mind on getting to know Java and simply searching out the great aid initially then I advise you join The Complete Java Master Class on Udemy. One of the most updated and comprehensive directions to examine Java. It became lately updated for Java 11 as properly.

Why you need to study Java Programming Language
Why Java is a high-quality Programming language – why research JavaHere is my listing of 10 reasons, which I tell each person who asks my opinion about studying Java, and whether Java is the nice programming language in phrases of opportunities, development and community support.

1) Java is Easy to analyze
Many would be surprised to see this one of the pinnacle motives for mastering Java or thinking about it as the fine programming language, but it’s miles. If you’ve got a steep learning curve, it might be hard to get productive in a short period, which is the case with most of the expert undertaking.

Java has fluent English like syntax with minimal magic characters e.G. Generics perspective brackets, which makes it easy to examine Java software and study quick.

Once a programmer is familiar with initial hurdles with installing JDK and putting in place PATH and recognize How Classpath works, it’s pretty smooth to jot down an application in Java.

2) Java is an Object-Oriented Programming Language
Another cause, which made Java famous is that it’s an Object Oriented Programming language. Developing OOP software is an awful lot less difficult, and it also facilitates maintaining device modular, flexible and extensible.

Once you’ve got the expertise of key OOP standards like Abstraction, Encapsulation, Polymorphism, and Inheritance, you can use all those with Java. Java itself embodies many exceptional practices and layout samples in its library.

Java is one of the few near a hundred% OOP programming language. Java also promotes the use of SOLID and Object-oriented design principles inside the shape of open supply projects like Spring, which make sure your object dependency is controlled properly by using Dependency Injection precept.

3) Java has Rich API
One greater reason for Java programming language’s big success is it’s Rich API and most importantly it is pretty visible because it includes Java installation.

Java offers API for I/O, networking, utilities, XML parsing, database connection, and nearly the whole thing. Whatever left is included with the aid of open supply libraries like Apache Commons, Google Guava, Jackson, Gson, Apache POI, and others.

You can, besides, see I put up 20 vital open source libraries for Java programmers to analyze more approximately useful libraries Java builders should recognize.

4) Powerful improvement gear e.G. Eclipse, Netbeans
Believe it or now not, Eclipse and Netbeans have performed a big role to make Java one of the nice programming languages. Coding in IDE is a satisfaction, in particular, if you have coded in DOS Editor or Notepad.
They no longer simplest assist in code of entirety however additionally gives a powerful debugging capability, that’s essential for real-global improvement. Integrated Development Environment (IDE) made Java development tons easier, quicker and fluent. It’s easy to go looking, refactor and examine code using IDEs.

Apart from IDE, Java platform additionally has numerous other gear like Maven and ANT for constructing Java packages, Jenkins for Continuous Integration and transport, decompilers, JConsole, Visual VM for monitoring Heap utilization, and so on.

5) Great collection of Open Source libraries
Open source libraries make sure that Java needs to be used everywhere. Apache, Google, and other organizations have contributed a variety of first-rate libraries, which makes Java improvement easy, faster and fee-powerful.
I usually endorse looking for capability in Google, before writing your code. There is a good threat that it’s already coded, examined and available for geared up to use.

You also can see Top 20 Libraries and API for Java Programmers for my encouraging libraries for Java builders.

6) Wonderful Community Support
A sturdy and thriving community is the most important electricity of Java programming language and platform. No count number, How proper a language is, it would not live on, if there’s no network to aid, help and proportion their know-how.

Java has been very lucky, it has lots of lively boards, StackOverflow, open source businesses and numerous Java user companies to help everything.

There is the community to assist beginners, superior or even professional Java programmers. Java honestly promotes taking and giving lower back to network addiction. Lots of programmers, who use open supply, contribute as a committer, tester, and so on.

Many Expert programmers provide recommendations FREE at numerous Java forums and StackOverflow. This is certainly exceptional and gives a variety of confidence to an amateur in Java.

7) Java is FREE
People like FREE things, Don’t you? So if a programmer desires to analyze a programming language or an agency wants to use technology, COST is an essential factor. Since Java is unfastened from the start, i.E. You don’t need to pay whatever to create Java utility.

This FREE issue additionally helped Java to become popular among character programmers, and amongst huge corporations. If you’re curious in which exactly Java is used inside the actual world, see that post. I have talked about Java’s adoption with the aid of all over the global.

The availability of Java programmers is every other big factor, which makes a company choose Java for there strategic development.

8) Excellent documentation support – Javadocs
When I first noticed Javadoc, I become surprised. It’s a notable piece of documentation, which tells loads of factors approximately Java API. I suppose without Javadoc documentation, Java would not be as famous, and it’s one of the essential motive, Why I think Java is the quality programming language.

Not everyone has time and purpose to have a look at the code to examine what a technique does or a way to use a category. Javadoc made gaining knowledge of easy, and provide a great reference even as coding in Java.

With the appearance of IDEs like Eclipse and IntelliJIDEA, you do not even need to appearance Javadoc explicitly within the browser, however you could get all the information on your IDE window itself.

9) Java is Platform Independent
In the Nineties, this became the main motive for Java’s reputation. The concept of platform independence is super, and Java’s tagline “write once run anywhere” and the acronym “WORA” become attractive sufficient to draw lots of new improvement in Java.

This continues to be one of the reasons for Java being the satisfactory programming language, the maximum of Java packages are advanced in the Windows environment and run on the Linux platform.

10) Java is Everywhere
Yes, Java is everywhere, it’s at the desktop, it is on cellular, it’s on the cardboard, almost everywhere and so is Java programmers. I assume Java programmers outnumber every other programming language expert.

Though I have no facts to again this up, it is based on enjoy.

This big availability of Java programmers is another reason, why businesses opt to pick out Java for new improvement than any other programming language.

Having stated that, programming is a very big subject and if you have a look at C and UNIX, which is still surviving and even more potent sufficient to live some other two decades, Java additionally falls in the same league.
Though there are a variety of talks about practical programming, Scala, and other JVM languages like Kotlin and Groovy, they want to move an extended way to suit the community, assets, and reputation of Java.

CORE JAVA COURSE OVERVIEW

What is core java

Core Java is Sun’s period, used to consult Java SE, the usual edition and a hard and fast of related technology, like the Java VM, CORBA, et cetera. This is mainly to distinguish from, say, Java ME or Java EE. Also, observe that they may be talking approximately a set of libraries in place of the programming language.
Application of Java and Core Java

Core Java refers to the Java Standard Edition (Java SE) that’s the simple basics of the Java platform and is used for the improvement of agency stage packages for each computer and server.

Java can Categories into Three elements:

Java SE (Core Java): Java SE is used for Developing Standalone software Or System Software that Runs on System simplest. In Java SE, you could Learn the basics of Java Like Inheritance, Polymorphism, Strings and so forth.

Java EE: Java EE is used for developing Web Applications that Run with the assist of Web Browser. In Java EE you could Learn the Advance topics Like Servlet, Java Server Pages(JSP), Enterprise Java Beans(EJB) and many others.

Java ME: Java ME is used for Developing Mobile Application That Run on The Mobile Phones. In The Java ME, you Learn about Android App Development.
Uses Of Core Java: Java is a programming language that helps you write software programs for plenty of structures. Whether you are writing a GUI software with a computer interface or developing server-side software, or a cell utility the use of Android, getting to know Java will serve you properly. Here are some

What is that this Course about?

This path is all approximately teaching Java to all of the coding enthusiasts wherein you will learn about exclusive concepts of Java. Upon of entirety of those online certification publications, you will be able to installation connections via JDBC, create JSP, and configuration of AOP in a Java utility; be it cell or computer.

We have an introductory set of java tutorials using eclipse(IDE).

We will cowl all the fundamentals of java programming starting with JDK, JVM to till Collection, MultiThreading, and Swing.

We pay attention and examine all the peoples who come right here by taking the syllabus based on their level of information on programming.

We even education individuals who do no longer have heritage information on programming.

We have the colleges who have more experience and presently operating in MNC, So you may get now not best the entire intensity about the concept as an alternative you will get actual-time use for them from their revel in.

What is Java used for?

Java can be used for developing an extensive range of cross-platform applications, starting from medical applications to monetary applications, from e-commerce web sites to android apps. It is used for developing Web applications, Standalone programs, Applets, Android apps and lots of greater.

Job Opportunity for Java?

Java is one of the comfy programming languages which is used on all one of a kind types of software so that you can consider how a lot of opportunities might be there in case you are aware of it. Then via learning other frameworks on top of this may place you like sweet in-among the ants.

Upon crowning glory of this on-line route, you will get several process possibilities inside the discipline of Java. Some of the positions that you can get are programmer analyst, software program engineer, center Java Developer, Java architect, C consultant, and UI developer. We provide on-line for completion and location at the side of our certification to assist our candidates.

CORE JAVA Interview Questions - Core Java Tutorials

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