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English Pages Professionell Java programmieren lernen! Java About the Tutorial Java is a high-level programming language originally developed by Sun Microsystems and released in This tutorial gives a complete understanding of Java. This reference will take you through simple and practical approaches while learning Java Programming language. Audience This tutorial has been prepared for the beginners to help them understand the basic to advanced concepts related to Java Programming language.
Prerequisites Before you start practicing various types of examples given in this reference, we assume that you are already aware about computer programs and computer programming languages. Java — Overview Java - Environment Setup Java — Basic Syntax Java — Basic Datatypes Java — Variable Types Java — Modifier Types Java — Basic Operators Java — Loop Control Java — Decision Making Java — Numbers Class Java — Character Class Java — Strings Class Java — Arrays Java — Regular Expressions Java — Methods Java — Exceptions Java — Inner Classes Java — Inheritance Java — Overriding Java — Polymorphism Java — Abstraction Java — Encapsulation Java — Interfaces Java — Packages Java — Data Structures Java — Collections Framework Entry Interface Java — Generics Java — Serialization Java — Networking Java — Sending E-mail Java — Multithreading Java — Applet Basics Java — Documentation Comments Java — Overview Java Java programming language was originally developed by Sun Microsystems which was initiated by James Gosling and released in as core component of Sun Microsystems' Java platform Java 1.
With the advancement of Java and its widespread popularity, multiple configurations were built to suit various types of platforms. Java is guaranteed to be Write Once, Run Anywhere. Java can be easily extended since it is based on the Object model. This byte code is distributed over the web and interpreted by the Virtual Machine JVM on whichever platform it is being run on.
If you understand the basic concept of OOP Java, it would be easy to master. Authentication techniques are based on public-key encryption. This design feature allows the developers to construct interactive applications that can run smoothly.
The development process is more rapid and analytical since the linking is an incremental and light-weight process. Java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time.
History of Java James Gosling initiated Java language project in June for use in one of his many settop box projects. Sun released the first public implementation as Java 1. On 8 May, , Sun finished the process, making all of Java's core code free and opensource, aside from a small portion of code to which Sun did not hold the copyright.
Just click the Try it button avaiable at the top-right corner of the code window to compile and execute the available code. There are certain examples which cannot be executed online, so we have skipped those examples. In such case, you can re-try to compile and execute the code using execute button available in the compilation pop-up window. What is Next? The next chapter will guide you to how you can obtain Java and its documentation. Finally, it instructs you on how to install Java and prepare an environment to develop Java applications.
Java - Environment Setup Java In this chapter, we will discuss on the different aspects of setting up a congenial environment for Java. Try it Option Online You really do not need to set up your own environment to start learning Java programming language.
Reason is very simple, we already have Java Programming environment setup online, so that you can compile and execute all the available examples online at the same time when you are doing your theory work. This gives you confidence in what you are reading and to check the result with different options. Feel free to modify any example and execute it online. Local Environment Setup If you are still willing to set up your environment for Java programming language, then this section guides you on how to download and set up Java on your machine.
Following are the steps to set up the environment. Java SE is freely available from the link Download Java. You can download a version based on your operating system. Follow the instructions to download Java and run the. Refer to your shell documentation, if you have trouble doing this. Example, if you use bash as your shell, then you would add the following line to the end of your '.
There are even more sophisticated IDEs available in the market. Next chapter will teach you how to write and run your first Java program and some of the important basic syntaxes in Java needed for developing applications. Java — Basic Syntax Java When we consider a Java program, it can be defined as a collection of objects that communicate via invoking each other's methods. Let us now briefly look into what do class, object, methods, and instance variables mean.
Example: A dog has states - color, name, breed as well as behavior such as wagging their tail, barking, eating. An object is an instance of a class. A class can contain many methods. It is in methods where the logics are written, data is manipulated and all the actions are executed.
An object's state is created by the values assigned to these instance variables. If there are no errors in your code, the command prompt will take you to the next line Assumption : The path variable is set.
If several words are used to form a name of the class, each inner word's first letter should be in Upper Case. If several words are used to form the name of the method, then each inner word's first letter should be in Upper Case. When saving the file, you should save it using the class name Remember Java is case sensitive and append '. Then the file should be saved as 'MyFirstJavaProgram.
Names used for classes, variables, and methods are called identifiers. In Java, there are several points to remember about identifiers. Java Modifiers Like other languages, it is possible to modify classes, methods, etc. However, an array itself is an object on the heap. We will look into how to declare, construct, and initialize in the upcoming chapters. Enums restrict a variable to have one of only a few predefined values.
The values in this enumerated list are called enums. With the use of enums it is possible to reduce the number of bugs in your code. For example, if we consider an application for a fresh juice shop, it would be possible to restrict the glass size to small, medium, and large. This would make sure that it would not allow anyone to order any size other than small, medium, or large. Methods, variables, constructors can be defined inside enums as well. Java Keywords The following list shows the reserved words in Java.
These reserved words may not be used as constant or variable or any other identifier names.
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