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1. Determine generic arguments of List<>
I'm using reflection to walk the field members of a class and I need to know for List<> subclasses, what the generic type parameters are. Given a field that has a type that is a subclass of List, how can I tell in a generic way what the type parameters of List<> are? For example: class X<T> { List<String> x1; // String ArrayList<String> x2; // String Subclass... 
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package java.lang.reflect;

A common interface for all entities that declare type variables.

Since:
1.5
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public interface GenericDeclaration {
    
Returns an array of TypeVariable objects that represent the type variables declared by the generic declaration represented by this GenericDeclaration object, in declaration order. Returns an array of length 0 if the underlying generic declaration declares no type variables.

Returns:
an array of TypeVariable objects that represent the type variables declared by this generic declaration
Throws:
GenericSignatureFormatError if the generic signature of this generic declaration does not conform to the format specified in the Java Virtual Machine Specification, 3rd edition
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    public TypeVariable<?>[] getTypeParameters();
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