concurrent activities, such as multimedia; and interpreted, for maximum portability
and dynamic capabilities。
Together, the above requirements comprise quite a collection of buzzwords, so let's
examine some of them and their respective benefits before going on。
What's completely new is the manner in which Java and its run—time system
have combined them to produce a flexible and powerful programming system..
Developing your applications using Java results in software that is portable
across multiple machine architectures , operating systems , and graphical user
interfaces, secure, and high performance, With Java, your job as a software
developer is much easier-you focus your full attention on the end goal of shipping
innovative products on time, based on the solid foundation of Java。 The better way
to develop software is here, now, brought to you by the Java language platform。
Very dynamic languages like Lisp, TCL, and SmallTalk are often used for
prototyping。 One of the reasons for their success at this is that they are very
robust—you don’t have to worry about freeing or corrupting memory。
Similarly, programmers can be relatively fearless about dealing with memory
when programming in Java, The garbage collection system makes the programmer’s job
vastly easier; with the burden of memory management taken off the programmer’s
shoulders, storage allocation errors go away. Another reason commonly given that
languages like Lisp, TCL, and SmallTalk are good for prototyping is that they
don't require you to pin down decisions early on—these languages are semantically
rich。
Java has exactly the opposite property : it forces you to make explicit
choices. Along with these choices come a lot of assistance—you can write method
invocations and , if you get something wrong, you get told about it at compile
time。 You don’t have to worry about method invocation error.
The Java beginner must grasp 30 basic concepts
Basic concept
1.In OOP the only relations is what the object's interface, such as the computer
seller he leaves alone internal structure of electrical source, but he is only concerned
about that whether the power will be supplied to you, also so long as know can or
not but is not how and why。All procedures are make up of certain attribute and the
behavior object, the different object visit invokes through the function
invocation, between the object all intercommunion are invoke through the method
invocation, By object data encapsulation, enhances reuse rate very much..
2。In OOP the most important thought is class, the class is the template ,is