基于 JVM 的编程语言，Kotlin 1.0 Beta 2 发布

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。

• 语言方面改进：类型参数强制约束 single-instantiation inheritance；改进 Diagnostics；改进编译器

• 库改进：为标准库清理了 APIs

• 新文档生成工具 Dokka

此外还有 IDE 方面的改进：

• Completion now works for Java static members and members of objects. Just press Ctrl+Space for the second time:
  

• Completion inside string templates has been added. For using it type "$name."
  

• Now we can choose exact position of a breakpoint while debugging expressions with lambdas:
  

• And finally, a bunch of intention actions have been added for importing Java statics, object members and enum entries. And there is an analogous one to *-import static members from Java classes or entries from enum classes
  

更多内容请看发行说明。