Developing client management system and edited Java ws7

developing client management system using react.js

• used @material-ui/core
  • Table
  • withStyles

Java

• edited Workshop 7
  • funtional interface’s name should be generous

    @FunctionalInterface
    public interface Area { //ShpaeProperty name is better than Area
      double calArea(double ... d); //varargs
    }
    

  • failed to use Arbitrary Number of Arguments within an abstract method in a functional interface
    • oracle doc
    • the problem was incomparable parameter types in lambda first type: double second type: double[]

      private Area area = (r1, r2) -> Math.PI * r1 * r2;
      // operator * cannot be applied to double, double[]