java - outputing lambda expression -


i'm having trouble in outputting result because of parameter map in interface iarea

public class lambda {      public static void main(string[] args) {          double x=10,y=8,pi=3.14159265359,radius=7;         iarea triangle = (map<shapeproperties, double> props) -> {         props.put(shapeproperties.base, x);         props.put(shapeproperties.height, y);          return (props.get(shapeproperties.base) *          props.get(shapeproperties.height) / 2);         };      iarea rectangle = (map<shapeproperties, double> props) -> {         props.put(shapeproperties.width, x);         props.put(shapeproperties.length, y);          return (props.get(shapeproperties.base) *          props.get(shapeproperties.height));         };      iarea circle = (map<shapeproperties, double> props) -> {         props.put(shapeproperties.radius, radius);         return (pi*math.pow(props.get(shapeproperties.radius),2));         };    //this part error occurs.     system.out.println(triangle.getarea(map<shapeproperties, double>      props)); }    }

could please guide me on how should approach outputting part of exercise? in advance.

here solution:

system.out.println(triangle.getarea(new hashmap<>()));

the point need of pass map object triangle.getarea()


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