Java Buzzwords

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This article list and explains java buzzwords.

• Simple
• Secure
• Portable
• Object-oriented
• Robust
• Multithreaded
• Architecture-neutral
• Interpreted
• High performance
• Distributed
• Dynamic

Java was designed to be easy for the programmer to learn and use effectively.
Assuming that you have some programming experience, you will not find Java hard to master.
If you already understand the basic concepts of object-oriented programming, learning Java
will be even easier. Best of all, if you are an experienced C++ programmer, moving to Java will
require very little effort. Because Java inherits the C/C++ syntax and many of the
object-oriented features of C++, most programmers have little trouble learning Java.

Although influenced by its predecessors, Java was not designed to be source-code compatible
with any other language. This allowed the Java team the freedom to design with a blank
slate. One outcome of this was a clean, usable, pragmatic approach to objects. Borrowing
liberally from many seminal object-software environments of the last few decades, Java
manages to strike a balance between the purist’s “everything is an object” paradigm and
the pragmatist’s “stay out of my way” model. The object model in Java is simple and easy
to extend, while primitive types, such as integers, are kept as high-performance nonobjects.

To better understand how Java is robust, consider two of the main reasons for program
failure: memory management mistakes and mishandled exceptional conditions (that is,
run-time errors). Memory management can be a difficult, tedious task in traditional
programming environments. For example, in C/C++, the programmer must manually allocate
and free all dynamic memory. This sometimes leads to problems, because programmers will
either forget to free memory that has been previously allocated or, worse, try to free some
memory that another part of their code is still using. Java virtually eliminates these problems
by managing memory allocation and de-allocation for you.

Java was designed to meet the real-world requirement of creating interactive, networked
programs. To accomplish this, Java supports multithreaded programming, which allows
you to write programs that do many things simultaneously. The Java run-time system
comes with an elegant yet sophisticated solution for multiprocess synchronization that
enables you to construct smoothly running interactive systems. Java’s easy-to-use approach
to multithreading allows you to think about the specific behavior of your program, not the
multitasking subsystem.

A central issue for the Java designers was that of code longevity and portability. One of the
main problems facing programmers is that no guarantee exists that if you write a program
today, it will run tomorrow—even on the same machine. Operating system upgrades,
processor upgrades, and changes in core system resources can all combine to make a
program malfunction. The Java designers made several hard decisions in the Java language
and the Java Virtual Machine in an attempt to alter this situation. Their goal was “write
once; run anywhere, any time, forever.” To a great extent, this goal was accomplished.
Interpreted and High Performance
As described earlier, Java enables the creation of cross-platform programs by compiling
into an intermediate representation called Java bytecode. This code can be executed on
any system that implements the Java Virtual Machine. Most previous attempts at
cross-platform solutions have done so at the expense of performance. As explained earlier,
the Java bytecode was carefully designed so that it would be easy to translate directly into
native machine code for very high performance by using a just-in-time compiler. Java run-time
systems that provide this feature lose none of the benefits of the platform-independent code.

Distributed Java is designed for the distributed environment of the Internet because it handles TCP/IP
protocols. In fact, accessing a resource using a URL is not much different from accessing a
file. Java also supports Remote Method Invocation (RMI). This feature enables a program to
invoke methods across a network.

Java programs carry with them substantial amounts of run-time type information that
is used to verify and resolve accesses to objects at run time. This makes it possible to
dynamically link code in a safe and expedient manner. This is crucial to the robustness of
the Java environment, in which small fragments of bytecode may be dynamically updated
on a running system.

Reference :- The Complete Reference Java By Herbert Childt


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