Java is an object-oriented, class-based, concurrent, secured and general-purpose computer-programming language. Basic I/O covers the Java platform classes used for basic input and output. It focuses primarily on I/O Streams, a powerful concept that greatly simplifies I/O operations. The lesson also looks at Serialization, which lets a program write whole objects out to streams and read them back again. Then the lesson looks at some file system operations, including random access files.

• Do not worry, your expectation will be fulfilled by the end of this tutorial.
• The same unmodified Java SE applications can be run on almost any computer, whether that computer uses the Microsoft Windows, Solaris, Linux, or OS X operating systems.
• Once you have properly set up your JDK; the JAVA_HOME variable and the PATH variable, you are ready to compile your first class.
• If you were able to compile it properly then you can advance to the next step and execute some code.
• It is a micro platform that is dedicated to mobile applications.

Java EE is different from the JDK and is outside the scope of this tutorial. You do not need Java EE to compile and run the simple application we are creating in this tutorial. Developers that work on large applications do not use plain text editors to manage their Java SE Lessons source code; they use Integrated Development Environments. IDEs are complex software applications, specialized in software development. If you see any compiler errors, then your program did not successfully compile, and the compiler did not create a .class file.

Java SE significant features

A Java SE application is an application written to the Java Platform, Standard Edition (Java SE). The same unmodified Java SE applications can be run on almost any computer, whether that computer uses the Microsoft Windows, Solaris, Linux, or OS X operating systems. Expert monitoring, diagnostics, and centralized management for enterprise and ISV Java-based applications. If the program works now, you’ll have to change your CLASSPATH variable in the same manner as the PATH variable above. Once you have properly set up your JDK; the JAVA_HOME variable and the PATH variable, you are ready to compile your first class.

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• The precise description of what is this byte code is beyond the scope of this tutorial.
• This lesson introduces the platform’s basic concurrency support and summarizes some of the high-level APIs in the java.util.concurrent packages.
• You should not type this character or paste it as it is not part of the tar command.

The JDK contains many tools and among them are the ones you will be using to compile and run a Java application. It is officially distributed by the OpenJDK project and by Oracle. If you are following this example to the letter, you should save the MyFirstClass class in a text file called MyFirstClass.java. If this technical term does not mean anything to you, do not worry, all you need to remember at this point is that all the code you write must be held in a Java class. This code contains special binary codes called byte code. The precise description of what is this byte code is beyond the scope of this tutorial.

Release Notes

An application that is distributed in nature, such as banking applications, etc. is called an enterprise application. It has advantages like high-level security, load balancing, and clustering. In Java, EJB is used for creating enterprise applications.

This lesson describes some of the APIs an application uses to examine and configure its platform environment. Exceptions explains the exception mechanism and how it is used to handle errors and other exceptional conditions. This first Java program showed you the basic steps every Java developer follows to run an application. If the program works now, you’ll have to change your CLASSPATH variable. To set this variable, consult the Updating the PATH variable section in the JDK installation instructions. If you still have problems, you might have to change your CLASSPATH variable.

Compiler Problems

All the commands you will be typing now should be typed in the same prompt as the one you used to set up these two variables. Executing this command may take several seconds or more, depending on your system. It creates a new directory in the current directory with the content of the JDK in it. There are several steps that you need to follow to create a Java application. This tutorial shows you how to create a very simple Java application.