The implementation code of chained call style in Scala and its extensive application in Spark programming Scala learning notes-41

Package Com.leegh.parameterization

/**
* @author Guohui Li
*/
Because breathe returns This,scala the return type is inferred as animal, and because animal has no eat method
Class Animal {def breathe = this}
Class Cat extends Animal {def eat = this}

Class Animal {def Breathe:this.type = this}
Class Cat extends Animal {def eat:this.type = this}

Object Singleton_types {
def main (args:array[string]): Unit = {
Val cat = new Cat
Cat.breathe.eat
}
}

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The implementation code of chained call style in Scala and its extensive application in Spark programming Scala learning notes-41