The getGenericType() method of java.lang.reflect.Field used to return a Type object representing the declared type of this Field object. The returned type object can be one of the implementations of Type’s subinterfaces: GenericArrayType, ParameterizedType, WildcardType, TypeVariable, Class. If the Type of Field object is a parameterized type, the returned Type object must accurately reflect the actual type parameters used in the source code and if the type of the underlying field is a type variable or a parameterized type, it is created. Otherwise, it is resolved. Syntax:
public Type getGenericType()
Parameters: This method accepts nothing. Return: This method returns a Type object that represents the declared type for the field represented by this Field object. Exception: This method returns the following Exceptions:
- GenericSignatureFormatError: if the generic field signature does not conform to the format specified in The Java™ Virtual Machine Specification.
- TypeNotPresentException: if the generic type signature of the underlying field refers to a non-existent type declaration.
- MalformedParameterizedTypeException: if the generic signature of the underlying field refers to a parameterized type that cannot be instantiated for any reason.
Below programs illustrate getGenericType() method: Program 1:
Java
// Java program to illustrate// getGenericType() methodimport java.lang.reflect.Field;import java.lang.reflect.Type;public class GFG { // initialize field private static int number; public static void main(String[] args) throws NoSuchFieldException { // get Field object Field field = GFG.class .getDeclaredField("number"); // apply getGenericType() method Type type = field.getGenericType(); // print Results System.out.println( "Type class: " + type.getClass()); System.out.println( "Type name: " + type.getTypeName()); }} |
Type class: class java.lang.Class Type name: int
Program 2:
Java
// Java program to illustrate// getGenericType() methodimport java.lang.reflect.Field;import java.lang.reflect.Type;public class GFG { // initialize field final static String value = "Geeks"; public static void main(String[] args) throws NoSuchFieldException { // get Field object Field field = GFG.class .getDeclaredField("value"); // apply getGenericType() method Type type = field.getGenericType(); // print Results System.out.println( "Type class: " + type.getClass()); System.out.println( "Type name: " + type.getTypeName()); }} |
Type class: class java.lang.Class Type name: java.lang.String
References: https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html#getGenericType–
