Package scala Scala 在互操作性上例如與 Java 平台時, 在預設的情況, 除了 import 本身的 scala 主套件外, 並 import java.lang 套件; 相對的在 .NET 平台時, import system 套件; 這時 Scala 如何來預定當名稱例如 String 類別在被調用時, 該叫用 scala 或者 java.lang 的呢 ? 反編譯 scala bytecode任何由 scalac 所產出的 bytecode 在經過反編譯後, 都包含著以下的內容, import scala.Predef.; import scala.ScalaObject; public final class implements ScalaObject { ... Predef..MODULE$.println(a); Predef Object
Scala API 文檔, Scala Predef Objecthttp://www.scala-lang.org/archives/downloads/distrib/files/nightly/docs/library/scala/Predef$object.html[source: scala/Predef.scala ]
保留詞: type38 @deprecated("use <code>java.lang.Integer</code> instead") 39 type Integer = java.lang.Integer 40 @deprecated("use <code>java.lang.Character</code> instead") 41 type Character = java.lang.Character 42 43 type String = java.lang.String 44 type Class[T] = java.lang.Class[T] 45 type Runnable = java.lang.Runnable 46 47 type Throwable = java.lang.Throwable 48 type Exception = java.lang.Exception 49 type Error = java.lang.Error ... 168 // printing and reading ----------------------------------------------- 169 170 def print(x: Any) = Console.print(x) 171 def println() = Console.println() 172 def println(x: Any) = Console.println(x) 173 def printf(text: String, xs: Any*) = Console.printf(text, xs: _*) 174 def format(text: String, xs: Any*) = stringWrapper(text).format(xs: _*) 175 176 def readLine(): String = Console.readLine() 177 def readLine(text: String, args: Any*) = Console.readLine(text, args) 178 def readBoolean() = Console.readBoolean() 179 def readByte() = Console.readByte() 180 def readShort() = Console.readShort() 181 def readChar() = Console.readChar() 182 def readInt() = Console.readInt() 183 def readLong() = Console.readLong() 184 def readFloat() = Console.readFloat() 185 def readDouble() = Console.readDouble() 186 def readf(format: String) = Console.readf(format) 187 def readf1(format: String) = Console.readf1(format) 188 def readf2(format: String) = Console.readf2(format) 189 def readf3(format: String) = Console.readf3(format) |