| J2SE 5.0 New Java Language Features [message #139607] |
Wed, 22 February 2006 15:21  |
Eclipse User |
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Originally posted by: milnfalcon4163.yahoo.com
Does eclipse really take advantage of or use the new features in J2SE 5.0
or is that still in the works?
Java Programming Language Documentation Contents
The Java Programming Language is a general-purpose, concurrent, strongly
typed, class-based object-oriented language. It is normally compiled to
the bytecode instruction set and binary format defined in the Java Virtual
Machine Specification.
Enhancements in JDK 5
Generics - This long-awaited enhancement to the type system allows a type
or method to operate on objects of various types while providing
compile-time type safety. It adds compile-time type safety to the
Collections Framework and eliminates the drudgery of casting. See the
Generics Tutorial. (JSR 14)
Enhanced for Loop - This new language construct eliminates the drudgery
and
error-proneness of iterators and index variables when iterating over
collections and arrays. (JSR 201)
Autoboxing/Unboxing - This facility eliminates the drudgery of manual
conversion between primitive types (such as int) and wrapper types (such
as Integer). (JSR 201)
Typesafe Enums - This flexible object-oriented enumerated type facility
allows you to create enumerated types with arbitrary methods and fields.
It provides all the benefits of the Typesafe Enum pattern ("Effective
Java," Item 21) without the verbosity and the error-proneness. (JSR 201)
Varargs - This facility eliminates the need for manually boxing up
argument lists into an array when invoking methods that accept
variable-length argument lists.
Static Import - This facility lets you avoid qualifying static members
with class names without the shortcomings of the "Constant Interface
antipattern." (JSR 201)
Annotations (Metadata) - This language feature lets you avoid writing
boilerplate code under many circumstances by enabling tools to generate it
from annotations in the source code. This leads to a "declarative"
programming style where the programmer says what should be done and tools
emit the code to do it. Also it eliminates the need for maintaining "side
files" that must be kept up to date with changes in source files. Instead
the information can be maintained in the source file. (JSR 175)
NOTE: The @Deprecated annotation provides a way to deprecate program
elements. See How and When To Deprecate APIs.
Generics papers
JSR14: Adding Generic Types to the Java Programming Language
Generics Tutorial (PDF) Bracha
Latest JSR14 draft specification which includes an older prototype release
of javac
Earlier public review draft specification from Java Community Process
Making the Future Safe for the Past: Adding Genericity to the Java
Programming Language (PDF)
Bracha, Odersky, Stoutamire, and Wadler. OOPSLA 98, Vancouver, October
1998. (other formats)
GJ: Extending the Java Programming Language with Type Parameters (PDF)
Bracha, Odersky, Stoutamire, and Wadler. A tutorial on GJ. August 1998.
(other formats)
Adding Generics to the Java Programming Language (PDF)
Bracha. Slides from JavaOne 2003 presentation.
Adding Wildcards to the Java Programming Language (PDF)
Torgersen, Hansen, Ernst, Ahe, Bracha and Gafter. An ACM paper, 2004.
General papers
New Language Features for Ease of Development in J2SE 5.0: A Conversation
with Joshua Bloch
Forthcoming Java Programming Language Features (PDF)
Enhancements in JDK v1.4
Assertion Facility - Assertions are boolean expressions that the
programmer believes to be true concerning the state of a computer program.
For example, after sorting a list, the programmer might assert that the
list is in ascending order. Evaluating assertions at runtime to confirm
their validity is one of the most powerful tools for improving code
quality, as it quickly uncovers the programmer's misconceptions concerning
a program's behavior.
For More Information
Java Language Specification
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Java Software
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