Java Generics Extends Class Parameter
问题 I received an error and I have this structure in my program public interface Shapes<T>{ //methods here } public class ShapeAction<T> implements Shapes<T>{ //Methods and implementations here } public class Circle extends ShapeAction<T>{ //Some methods here } The error is pointing at class Circle extends Shapes< T > where it says "T cannot be resolved to a type". If I set T to string the error will go away but that also means I can only use one datatype. What should I put inside the <> so that