The delayed binding of Scala learning

1  PackageCom.swust.example2  3Object TraitDemo2extendsapp{4  5    //Abstract class6      Abstract classWriter {7 def writemessage (message:string)8      }9      /**Ten * Inherit this abstract class, and call this abstract method with super One * Scala requires that methods be declared as abstract override A * Override tells Scala to provide an implementation for a known method of the base class - * Abstract indicates that the actual final implementation of this method is provided by the class that mixes this trait -       */ theTrait Uppercasewriterextendswriter{ -         AbstractOverride Def writemessage (message:string) ={ -            Super. Writemessage (message.touppercase) -         } +      } -      /** + * Two things to call Super.writemessage,scala A * 1. Delay binding for this call at * 2. The class required to mix these trait provides the implementation of this method -       */ -Trait Wordfilterwriterextendswriter{ -         AbstractOverride Def writemessage (message:string) ={ -            Super. Writemessage (Message.replace ("stupid", "s-----")) -         } in      } -      classStringwriterdelegateextendswriter{ toVal writer =NewJava.io.StringWriter +         //implement the method of the abstract class without the override -def writemessage (message:string) =writer.write (message) theOverride Def toString (): String =writer.tostring *      } $      //mix trait When creating an instancePanax NotoginsengVal First =Newstringwriterdelegate with Uppercasewriter with Wordfilterwriter -Val last =Newstringwriterdelegate with Wordfilterwriter with Uppercasewriter theFirst.writemessage ("There is no sin except stupidity") +Last.writemessage ("There is no sin except stupidity") A println (first) the println (last) +        -}

The delayed binding of Scala learning