新闻 Kotlin 1.0 Beta 3 发布，基于 JVM 的编程语言 下载

Kotlin 1.0 Beta 3 发布，此版本主要是要完成标准库开发，还有移除一些废弃的语言结构。同时还有一些 bug 修复，性能提升。此版本包括库，语言，IDE 和 Android 扩展方面的改进和修复。详细改进内容请看发行说明。

改进列表：

• 
  Library
  
  
  • 
    increment deprecated in Progressions in favor of step property to Progressions, for-loops updated to refer to step
    
    
  • 
    contains() and other similar extensions now accept supertypes of the element of the collection
    
    
  • 
    Delegates.mapVal and mapVar, MapVal, MapVar, FixedMapVal, FixedMapVar are deprecated
    
    
  • 
    String.toCharArray() introduced instead of String.getChars(); String.toCharList() deprecated
    
    
  • 
    MutableCollection.removeAll(predicate: (T) -> Boolean) and similar for retainAll added
    
    
  • 
    sequence(initialValueFunction, nextValueFunction) doesn't evaluate first value until it's requested by sequence iterator
    
    
  • 
    sequenceOf(Progression) deprecated
    
    
  • 
    flatten operation for Sequence<Iterable<...>> added
    
• 
  Langauge
  
  
  • 
    No references to PropertyMetadata are generated in the byte code
    
    
  • 
    Suffixes to numeric literals, such as 1baz are prohibited
    
    
  • 
    Comma-separated conditions in when without an argument are prohibited (KT-5143)
    
    
  • 
    Annotation classes can't be instantiated (KT-4391)
    
    
  • 
    Arrays of annotations supported as annotation arguments (KT-10136)
    
    
  • 
    Generic types in catch clauses (including reified T) are prohibited (KT-9816)
    
    
  • 
    protected members are allowed in companion objects
    
    
  • 
    Calls to non-@JvmStatic protected members of companion objects from subclasses are marked as errors (unsupported)
    
    
  • 
    "…" is reserved as a token (KT-9708)
    
    
  • 
    Enum entry can not be used as a type (KT-5401)
    
    
  • 
    Enum.values is deprecated in favor of Enum.values()
    
    
  • 
    private setters are now deprecated for open properties
    
    
  • 
    Local sealed classes are deprecated
    
    
  • 
    Use of uninitialized variables in lambdas / object literals / local functions is forbidden
    
    
  • 
    Overriding setter cannot weaken visibility
    
    
  • 
    Inner classes are no longer allowed inside enum entries
    
    
  • 
    Implicit receiver smart casts are supported
    
    
  • 
    Older deprecations have become errors
    

下载：

kotlin-compiler-1.0.0-beta-3595.zip


Kotlin 是一个基于 JVM 的新的编程语言，由 JetBrains 开发。

其主要设计目标：

• 
  创建一种兼容Java的语言
  
  
• 
  让它比Java更安全，能够静态检测常见的陷阱。如：引用空指针
  
  
• 
  让 它比Java更简洁，通过支持variable type inference，higher-order functions (closures)，extension functions，mixins and first-class delegation等实现。
  
  
• 
  让它比最成熟的竞争对手Scala语言更加简单。
  

Kotlin 1.0 Beta 3 发布，基于 JVM 的编程语言下载地址