Why Java Course is popular? | Features Of Java | Java Courses | Online Courses | The National TV
Java is an object-oriented programming language developed by Sun Microsystems in 1991. The language has many similarities to C++ tough in Java everything has to be done in a class while in C++, procedural programming can ales be done. The people who want to make their career in Java programming has to learn it from beginner to advance. The developers will learn the following:
- Object creation
Java is machine-independent as the compiler compiles the code into platform-independent byte code. The code is read by Java virtual machine and then executed.
Java is much popular among developers. According to some surveys, around nine million people are using java and it is being used on 7 billion devices. This survey itself tells the popularity of Java.
People who want to make their career in Java can join various Java courses in various institutes. Some of them are for the short-term and some are for the long-term. These courses help people to get trained in the language. After doing the course, a student can either join a company or can teach the same in other institutes.
Features of Java
Various features of Java have made it popular among the developers as they can develop web as well as desktop applications. The only thing that they have to install is Java Virtual Machine, which will run the byte code even if Java software has not been installed on the machine. Some of the features of Java which has made it popular are here.
Java is very easy to learn even for the people who are not familiar with any programming language. If one is familiar with C++ then learning Java will be much easier for him. Some of the features that exist in C++ like pointers or operator overloading which were seldom used have been removed in Java. If the code includes any unused objects it is automatically transferred to Java Garbage Collector.
Java is an object-oriented language. All the code has to be defined in a class and the object of the class can be used to call its functions, variables, constructors etc. The basic concepts that Java programming holds are:
Example of creating a class
public class lamp
public void putOn()
One thing to note is that everything is in curly bracket. In this example,
- lamp is a class
- public lamp() is a constructor
- public void putOn() is a method.
Java is platform-independent as its code can write on one platform and run on another. The code needs to be compiled, which creates a class file in the form of byte code. The byte code can be run on those machines that have Java Virtual Machine installed.
Java is popular for its security and virus-dree code can be developed through the language. Security is provided in the following ways.
Classloader is a part of the JRE or Java Runtime Environment through which classes are loaded into Java Virtual Machine. It separates the package of the local file system from the packages that are imported from the network.
It checks whether the code has illegal fragments or not regarding accessing the objects.
This checks the access points of the class. It means that it checks how a class reads or writes a file or uses other local resources.
These security features are already installed with the language and if a developer wants to put more security, he can do so through his code.
The memory management of the language is strong and security problem is also avoided due to the absence of pointers. Besides this, the garbage collector collects all those objects automatically which are present in code but are unused.
As mentioned earlier, Java code can be run on any platform that has a java virtual machine. The byte code that is created in the form of the class file by compilation can run on Java virtual machine.
As byte code is closer to native code, java code executes faster in comparison to other interpreted languages.
RMI and EJB are used to develop distributed applications in which files can be accessed from any machine on the internet by calling some methods.
Thread is a separate class in Java through which users can create applications that perform animations. Even games can be developed through the thread.
In Java, classes can be called on-demand thus making it a dynamic language. Many functions from C and C++ can also be called in Java.
Packages in Java
Java has a huge library of packages, which have public and private classes, variables, constants, constructors and methods. Users can use this in order to make their applications. The developers have to use the import keyword to use a package. Here is an example
The import keyword with the package name should be the first line of the code. There are two types of packages in Java- inbuilt and user-defined. Java has many inbuilt packages and developers can make their package and add classes in it.
Here is the description of some of the inbuilt packages.
java.lang: This package is automatically imported and users can use its classes in their codes. The code can include math operations. The class also contains primitive datatypes.
java.io: This package is used for input and output operations. The package also has classes through programmers can read and write files.
java.util: This package has collection classes and interfaces through which various types of lists can be created. Besides lists, date and time operations can also be performed through the package.
java.applet: This package can be used to create applications based using applets.
java.awt: This package can be used to create a graphical user interface. Many components, menus, frames, buttons, radio buttons, checkboxes, horizontal and vertical scroll bars, etc. can be created and added to the applet.
java.net: This package can be used to create networking based applications.
Besides these, there are many other packages with which database connectivity can be done, servlets and java server pages can be created.
Thus it can be said that Java can be used to create all types of applications whether they are related to web or desktop. The rich library of packages helps a user to make the applications easy.
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