本文介绍了JavaTM语言的六大关键增强特性：泛型提供编译时类型安全；增强for循环简化集合与数组迭代；自动装箱/拆箱消除原始类型与包装类型间的转换；类型安全枚举实现灵活的对象导向枚举；可变参数简化变长参数列表调用；静态导入避免完全限定名。这些特性共同提升了Java编程的效率与安全性。
Performance Enhancements:
JavaTM Language Features
No1. Generic(泛型) (关键字: compile-time,type-safe, drudegery ,casting)
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.
No2.Enhance for Loop(循环)
This new language construct eliminates the drudgery and error-proneness of iterators and index variables when iterating over collections and arrays.
No3.AutoBoxing/Unboxing(自动装包/拆包)
This facility eliminates the drudgery of manual conversion between primitive types (such as int) and wrapper types (such as Integer).
No4. TypeSafe Enums (枚举)
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 without the verbosity and the error-proneness.
No5. Varargs(可变参数)
This facility eliminates the need for manually boxing up argument lists into an array when invoking methods that accept variable-length argument lists
No6.Static Import(静态导入)
This facility lets you avoid qualifying static members with class names without the shortcomings of the "Constant Interface antipattern."
No7. Metadata (Annotations)
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
JavaTM Language Features
No1. Generic(泛型) (关键字: compile-time,type-safe, drudegery ,casting)
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.
No2.Enhance for Loop(循环)
This new language construct eliminates the drudgery and error-proneness of iterators and index variables when iterating over collections and arrays.
No3.AutoBoxing/Unboxing(自动装包/拆包)
This facility eliminates the drudgery of manual conversion between primitive types (such as int) and wrapper types (such as Integer).
No4. TypeSafe Enums (枚举)
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 without the verbosity and the error-proneness.
No5. Varargs(可变参数)
This facility eliminates the need for manually boxing up argument lists into an array when invoking methods that accept variable-length argument lists
No6.Static Import(静态导入)
This facility lets you avoid qualifying static members with class names without the shortcomings of the "Constant Interface antipattern."
No7. Metadata (Annotations)
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
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