Shulou(Shulou.com)06/03 Report--

Let's first take a look at the code for defining variables.

Package com.dt.scala.type_parameterizationclass Pair_ val pair [T = 0) first else second}} object View_Bounds {def main (args: Array [String]): Unit = {val pair = new Pair_NoPerfect ("Spark", "Hadoop") println (pair.bigger)}}

If the argument we want to pass in is an integer, the compiler will report an error

Indicates that Int is not a subclass of Comparable. But Int can be implicitly converted to RichInt, which is a subclass of Comparable.

Then we can use view definition (view bound) to implement

Package com.dt.scala.type_parameterizationclass Pair_ NoPerfect [T = 0) first else second}} / / replace the: in the variable delimiting symbol with%, then it becomes the view definition RichInt println (pair.bigger)}}

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