INTRODUCTION TO JAVA

What is Java?

• WHAT IS JAVA 
• HOW DOES IT WORK
• ADVANTAGES AND DISADVANTAGES 

Java is an object-oriented programming language and software that's used in a wide range of devices, including medical equipment, game consoles, and mobile phones. Java adheres to the same standards and syntax as C and C++.

One of the key benefits of Java programs is its portability. Once Java code is produced, it's easy to transfer it from a laptop to a mobile device. "Write once, run anywhere" was the driving force behind the Java language's 1991 creation by James Gosling of Sun Microsystems, who was later acquired by Oracle.

We need to remember that Java and JavaScript are two very different things. JavaScript runs without compilation, whereas Java code requires it. Additionally, JavaScript is browser-specific as opposed to Java, which is used everywhere.

At a dizzying rate, software development tools that were once thought to be necessary are being replaced by newer, better ones. Java has managed to endure for over two decades despite all of this change; developers continue to prefer it to other well-liked programming languages like Ruby, PHP, Swift, C++, and Python, and it remains the most often used language for developing apps. Because of this, having strong Java skills is still essential to get a job.

How does Java work?

Two components of the broader Java technology are the Java programming language and platform. To construct a Java program, the Java Development Kit (JDK) must be downloaded. Linux, macOS, and Windows may all use the JDK. After writing any Java code, the compiler converts it into bytecode that the JVM (Java Virtual Machine) in the JRE can comprehend and run. Java bytecode can be executed without modification on any system that supports JVMs, thus you can run Java code anywhere.

The Java software platform consists of the JVM, the Java API, and an integrated development environment. Java bytecode processing and execution (interpretation) are handled by the JVM. The Java Application Programming Interface (API) is made up of a large number of libraries that provide functions including online services, XML (Extensible Markup Language) generation, and basic object, network, and security operations. The Java software platform and language are a reliable and well-established technology for corporate software development. They complement each other perfectly.

Why does Java matter?

You most likely already know about Java's numerous applications as a business application developer; your organization most likely has thousands, if not millions, of lines of Java code executing in production. Java expertise will probably be required for troubleshooting, upgrading, and maintaining the present code.

However, you're missing the mark if you just know Java for its more traditional applications. Based on the Java programming language, the Android operating system powers most smartphones in use today. Java is one of the most popular languages used in data science and machine learning. Java has emerged as a popular choice for many online transactions because of its durability, ease of use, security, and compatibility with many platforms.

Web applications are the cornerstone of digital commerce in all industries, and Java technology offers the ideal framework for their creation. Web services, XML, and Java components are contained in Java application servers, which are used to offer dynamic online content and interface with databases. Java application servers, which provide capabilities like scalability, connectivity, performance, availability, security, clustering, and event management, may be dependably used to deploy enterprise applications.

Advantages and disadvantages of Java

Java is a general-purpose GPU (GPU) programming language that features an oops mechanism, security, and resilience. Because English is the basis of its grammar, it is a high-level language. It was envisioned and built by Sun Microsystems in 1995. Oracle now manages maintenance and distribution. Java is frequently referred to as a platform due to its application programming interface (API) and runtime environment.

Java has been used in many applications over the years. However, it has several advantages and disadvantages listed below.

Advantage

     1) Simple

Java is a simple programming language because we can easily learn it and also understand it easily. Its C++-based syntax makes use of automatic garbage collection, so we won't have to worry about freeing up memory for the reference objects. Furthermore, Java no longer has features like operator overloading and clean pointers. facilitating kids' reading and writing.

 

     2)  Object-oriented

Because of its object-oriented design, Java is more useful in real-world applications. In Java, all of the data and actions are handled by an object. Java is built on object-oriented concepts such as inheritance, classes, objects, polymorphism, encapsulation, and abstraction.

 

      3) Secured

Java is regarded as a protected programming language as it doesn't employ explicit references. To run Java programs, a virtual machine sandbox is also utilized. The class loader included in the JRE may be used to dynamically load classes into the JVM. Because of this, class packages stored locally in the file system are isolated from network-imported packages.

 

    4) Robust

Java is one of the strong programming languages because it has control over memory management means that it uses strong memory management. With Java code, we can also handle exceptions. We may also use type-checking to improve code security. It does not contain any explicit pointers that would prevent a programmer from directly accessing memory through code.

 

    5) Platform independent

Compilation is not always required because Java code may run natively on a variety of platforms. It's a one-time thing for any language (WORA) that can be compiled into bytecode. Because it is not platform-specific, bytecode may execute on a wide variety of devices.

 

    6) Multithreading

Java's multithreading environment allows a larger task to be split up into many threads and executed separately. Thanks to multithreading, we might be able to avoid allocating Memory for each thread that is operating.

 

Disadvantage

    1) Performance

The requirement for runtime translation makes Java slower than languages like C and C++, but it guarantees cross-platform compatibility. C++ applications, on the other hand, execute faster since they are instantly compiled in binary format for all platforms.

 

    2) Memory consumption

It needs more memory as it runs on top virtual machine

 3) Cost

Java is a rather expensive programming language due to its high memory and processing requirements. Java programming requires new hardware to be implemented.

 4) Less machine interactive

Java's lack of a direct machine interface and confusing pointers may make it less useful for software that has to run quickly and have a direct touch with a machine.

 

    5) Garbage collection

Java features automatic garbage collection, over which the developer has no control. It is devoid of memory-freeing functions like delete () and free ().

Java is still a widely used programming language despite its numerous shortcomings because of its many advantages, which include safety, stability, and platform independence.