Free Java Ebooks & Reviews

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Java Reference Guide

by Steven Haines

Java is simple. That simplicity derives from syntax similar to C/C++ and the omission of complex C/C++ features such as multiple implementation inheritance, pointers, and operator overloading.
Java is object-oriented. Java’s object-oriented nature encourages a developer to think in terms of classes and objects rather than separate code and data. That class/object focus results in code that is easier to write, easier to maintain, and easier to reuse.
Java is network-savvy. A TCP/IP library simplifies the development of programs that communicate with HTTP, FTP, and other TCP/IP network processes. Furthermore, the library’s use of the same stream-oriented mechanism for communicating with remote network processes that file-oriented code uses to communicate with files on a computer’s local hard drive helps a developer write network code faster.
Java is interpreted. Java’s compiler translates source code into class files of bytecode instructions. A virtual machine examines each instruction and uses that instruction’s meaning to execute an equivalent sequence of platform-dependent instructions. Interpretation speeds up the development process and simplifies debugging.
Java is robust. Errant programs do not crash the virtual machine or corrupt the underlying (native) platform. Robustness is achieved, in part, by not supporting C/C++ pointers, by providing a garbage collector to automatically free up dynamically allocated memory (instead of forcing the developer to accomplish that task), by performing strict compile-time/runtime type checking, and by providing true arrays with bounds checking.
Java is secure. Java’s "sandbox" security model identifies sensitive operations (such as file I/O) that a malicious program can exploit to harm the native platform, and provides a mechanism for allowing or preventing access to those operations.
Java is architecture-neutral. A compiled Java program’s bytecode instructions target a generic virtual machine instead of a specific platform. Because each platform-specific virtual machine implementation supplies a consistent interface to the bytecodes, the same Java program runs on diverse platforms (via their virtual machines).
Java is portable. Portability is achieved through architecture neutrality and through a strict definition of the language (which permits no implementation-dependent features). For example, Java’s integer primitive type always means a signed 2’s complement 32-bit integer. In contrast, the C/C++ integer type can be unsigned, and its size varies according to a platform’s register size (typically 32 bits or 64 bits).
Java is high-performance. Many virtual machines use a just-in-time (JIT) compiler to dynamically compile a program’s bytecode instructions into platform-specific instructions (which execute faster than bytecodes) as the program runs.
Java is multithreaded. Support for threads is built into the language via thread-synchronization primitives. There is also a thread library.
Java is dynamic. Java’s use of an interface type to distinguish between what a program must do and how that task gets accomplished helps Java adapt to a continually evolving environment, and makes it easier for vendors to modify Java libraries without breaking program code that uses those libraries.

Interface Design Best Practices in Object-Oriented API Design in Java

by Bill Venners

The books target intermediate Java programmers who want to become "better" Java programmers. They will help readers who are already familiar with the syntax and semantics of the Java language become more competent in actually using the Java language to solve real programming problems.

Before getting started, I'd like to clarify a few terms.

Designer vs. client programmers
Most Java programmers have two hats on their shelf, which they wear at different times. Sometimes they wear their "designer" hats and build libraries of classes for others to use; other times they wear their "client" hats and make use of a library of classes created by someone else. Some Java programmers even where both hats at the same time, completely oblivious to the rules of fashion.

One aspect of the flexibility of a body of code is the ease with which a client programmer can understand the code. Whether a client programmer is planning to change code or just use it as is, that programmer often has to figure out how to change or use the code by reading it.

The guidelines discussed in this book will talk about flexibility in terms of client programmers. Designs and implementations that are flexible are those that are easy for client programmers to understand, use, and change.

Download free java ebooks

Java Reference Guide

Interface Design Best Practices in Object-Oriented API Design in Java

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