Having said that, not all books are equally suitable for all programmers. It doesn't matter whether you are completely new to Java or have been programming in Java for over five years, you will learn a lot of new things through these books. These books are the best available today and equally useful for beginners, intermediate, and advanced Java programmers. Though I have read many of them already (I have read Effective Java at least four times), I always want to learn something new. These Java books are my personal favorites, and whenever I get some time, I prefer to read them to refresh my knowledge. They cover the subject with more details and explanation.They are written by programmers who are an authority in the subject.Despite having so many free resources available in Java, like tutorials, tips, blogs, and code examples, Java books have their own place because of these two reasons: Whenever a programmer starts learning the Java programming language, the first question he asks is, " Which book should I refer to learn Java?," or "What is the best book to learn Java for beginners?," or "Can you tell me some good books to learn Java?" That, itself, says how important Java books are for programmers especially beginners. It is a good practice to use names of packages with lower case letters to avoid any conflicts with the names of classes and interfaces.These top Java programming books are some of the best books to learn Java - I would even say that some of them are the best Java books ever published. Let us look at an example that creates a package called animals. Then a folder with the given package name is created in the specified destination, and the compiled class files will be placed in that folder. Javac -d Destination_folder file_name.java To compile the Java programs with package statements, you have to use -d option as shown below. If a package statement is not used then the class, interfaces, enumerations, and annotation types will be placed in the current default package. There can be only one package statement in each source file, and it applies to all types in the file. The package statement should be the first line in the source file. While creating a package, you should choose a name for the package and include a package statement along with that name at the top of every source file that contains the classes, interfaces, enumerations, and annotation types that you want to include in the package. Using packages, it is easier to provide access control and it is also easier to locate the related classes. Since the package creates a new namespace there won't be any name conflicts with names in other packages. It is a good practice to group related classes implemented by you so that a programmer can easily determine that the classes, interfaces, enumerations, and annotations are related. Programmers can define their own packages to bundle group of classes/interfaces, etc. Java.io − classes for input, output functions are bundled in this package Java.lang − bundles the fundamental classes Some of the existing packages in Java are − Packages are used in Java in order to prevent naming conflicts, to control access, to make searching/locating and usage of classes, interfaces, enumerations and annotations easier, etc.Ī Package can be defined as a grouping of related types (classes, interfaces, enumerations and annotations ) providing access protection and namespace management.
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