What is Java, A widely-used, high-level, object-oriented programming language developed by Sun Microsystems (now owned by Oracle Corporation) in the mid-1990s. It was designed to be platform-independent, meaning that Java programs can run on any operating system or platform that has a Java Virtual Machine (JVM) installed, making it highly portable.
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What is Java | Learn Java | Types of Java
1. W hat is J ava | Learfi J ava | Types of J ava
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W hat is J ava?
What is Java, A widely-used, high-level, object-oriented programming language developed by Sun
Microsystems (now owned by Oracle Corporation) in the mid-1990s. It was designed to be
platform-independent, meaning that Java programs can run on any operating system or platform
that has a Java Virtual Machine (JVM) installed, making it highly portable.
Key characteristics afid features of J a v a ificlude:
Platform ifidepefidefice:
Java achieves platform independence through the “Write Once, Run Anywhere” (WORA) principle.
You can write Java code on one platform and run it on another platform with a compatible JVM,
without modi몭 cation.
Object-Oriefited:
Java is an object-oriented programming (OOP) language, which means it uses objects to model
and manipulate data and provides features like inheritance, encapsulation, and polymorphism.
Robust:
Java was designed with a strong emphasis on error checking during compilation and runtime,
making it less prone to common programming errors.
Multi-threaded:
Java supports multithreading, allowing developers to write programs that can perform multiple
tasks concurrently, which is crucial for developing applications that can handle multiple users or
perform tasks in parallel.
Garbage Collectiofi:
Java’s automatic garbage collection system manages memory by reclaiming memory occupied by
objects that are no longer in use, simplifying memory management and reducing the risk of
memory leaks.
2. Security:
Java has built-in security features, including a robust security model, which helps protect against
viruses and malware.
Rich Stafidard Library:
Java comes with a comprehensive standard library that provides a wide range of pre-built classes
and APIs for various tasks, such as networking, 몭l
eI/O, data manipulation, and more.
Commufiity afid Ecosystem:
Java has a large and active developer community, which has contributed to the creation of
numerous libraries, frameworks, and tools, making it suitable for a wide range of applications,
including web development (Java EE), mobile app development (Android), and more.
Versatile:
Java can be used for a variety of application types, including desktop applications, web
applications, mobile apps (Android), embedded systems, and server-side development.
Opefi Source:
While the core Java platform is largely controlled by Oracle, there are open-source
implementations of the Java platform, such as OpenJDK, which are freely available and widely
used.
Java has remained popular in enterprise-level software development and is also used extensively
in Android app development. It continues to evolve with new features and updates to meet the
changing needs of the software development community.
3. How Mafiy Types of J ava are there?
There are several di몭 erent 몭 avorsor editions of Java, each designed for speci몭 ctypes of
development. The main types of Java include:
J ava Stafidard Editiofi( J ava SE) :
Also known as Java SE or J2SE (Java 2 Platform, Standard Edition).
Designed for developing standalone desktop and command-line applications.
It provides the core libraries and APIs for general-purpose Java programming.
J a v a Efiterprise Editiofi ( J a v a EE):
Formerly known as J
2EE (J
ava 2 Platform, Enterprise Edition).
Geared toward developing large-scale, enterprise-level applications such as web applications,
middleware, and server-side applications.
Provides additional libraries and speci몭 cations for distributed computing and web services.
J ava Micro Editiofi( J ava ME) :
Designed for developing applications on resource-constrained devices like mobile phones, PDAs,
and embedded systems.
Java ME has been largely replaced by other mobile development platforms, but it still has some
niche applications.
J ava Card:
A subset of Java ME designed for smart cards and other small-memory devices.
Used in applications like SIM cards, secure identi몭 cation, and payment systems.
Afidroid:
Although not a formal “edition” of Java, Android uses a modi몭 edversion of Java for mobile
application development.
4. Android’s 몭av
o
rof Java includes its own libraries and runtime environment, which is distinct from
standard Java SE.
JavaFX:
A platform for creating rich internet applications using Java.
Designed for developing cross-platform, multimedia-rich applications with a modern graphical
user interface (GUI).
J ava Embedded:
Tailored for developing applications on embedded systems and IoT (Internet of Things) devices.
Allows Java to run on a wide range of hardware, from small sensors to industrial machines.
Other Variafits afid Implemefitatiofis:
There are also various implementations of the Java Virtual Machine (JVM), such as Oracle’s
HotSpot, OpenJDK (open-source), and others. These may o
몭e
rslightly di몭 erent features or
performance characteristics.
It’s important to note that while these di몭 erent types of Java have distinct purposes and libraries,
they all share the core Java language and syntax. This means that if you learn Java programming,
you can apply your knowledge to various Java editions with some adjustments and additional
learning as needed for speci몭 cplatforms.
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