Method Class | getAnnotatedReturnType() method in Java
The java.lang.reflect.Method.getAnnotatedReturnType() method returns an AnnotatedType object which represents AnnotatedType to specify return type of Method Object. If Method object is created for a constructor, then AnnotatedType object specifies the type of the constructed object. If Method object is created for a method, the AnnotatedType object specifies the use of a type to specify the return type of the method specified in the source code.
The returned AnnotatedType represents implementation of AnnotatedType itself or any of its sub-interfaces like AnnotatedArrayType, AnnotatedParameterizedType, AnnotatedTypeVariable, AnnotatedWildcardType. AnnotatedType represents the potentially annotated use of any type including an array type, a parameterized type, a type variable, or a wildcard type currently running in Java Virtual Machine.
Syntax:
public AnnotatedType getAnnotatedReturnType()
Return Value: This method returns an AnnotatedType object which represents AnnotatedType to specify return type of Method Object.
Below programs illustrates getAnnotatedReturnType() method of Method class:
Example 1:Use AnnotatedType() for a specific method given as Input.
The program contains a Method name getAddressMethod which contains AnnotatedType. So this program is going to get details of AnnotatedType, contained by getAddressMethod Method.
import java.lang.annotation.*;
import java.lang.reflect.AnnotatedType;
import java.lang.reflect.Method;
import java.util.Arrays;
public class GFG {
@Target ({ ElementType.TYPE_USE })
@Retention (RetentionPolicy.RUNTIME)
private @interface customAnnotatedType {
}
public @customAnnotatedType String getAddress()
{
return null ;
}
public static void main(String[] args)
{
try {
Class classobj = GFG. class ;
Method getAddressMethod = null ;
Method[] methods = classobj.getMethods();
for (Method m : methods) {
if (m.getName().equals( "getAddress" ))
getAddressMethod = m;
}
AnnotatedType annotatedType = getAddressMethod
.getAnnotatedReturnType();
System.out.println( "Method Name: "
+ getAddressMethod.getName());
System.out.println( "Type: "
+ annotatedType.getType().getTypeName());
System.out.println( "Annotations: "
+ Arrays.toString(annotatedType.getAnnotations()));
}
catch (Exception e) {
e.printStackTrace();
}
}
}
|
Output:
Method Name: getAddress
Type: java.lang.String
Annotations: [@GFG$customAnnotatedType()]
Example 2: To print Annotation on array type or multidimensional array or Generic for Methods of class GFG.
import java.lang.annotation.*;
import java.lang.reflect.*;
import java.util.List;
public class systemUTCMethodDemo<T> {
@Target ({ ElementType.TYPE_USE })
@Retention (RetentionPolicy.RUNTIME)
private @interface customAnnotatedType {
}
public @customAnnotatedType String[] getAddress()
{
return null ;
}
public String[] @customAnnotatedType [] getvalues()
{
return null ;
}
public @customAnnotatedType List<T> getWords()
{
return null ;
}
public static void main(String[] args)
{
try {
Class classobj = systemUTCMethodDemo. class ;
Method[] methods = classobj.getMethods();
for (Method m : methods) {
if (m.getName().equals( "getAddress" )
|| m.getName().equals( "getvalues" )
|| m.getName().equals( "getWords" )) {
printDetails(m);
}
}
}
catch (Exception e) {
e.printStackTrace();
}
}
public static void printDetails(Method m)
{
AnnotatedType annotatedType = m.getAnnotatedReturnType();
System.out.println( "Method Name: " + m.getName());
System.out.println( "Type: " + annotatedType.getType().getTypeName());
System.out.println( "Annotations: " + annotatedType);
System.out.println();
}
}
|
Output:
Method Name: getWords
Type: java.util.List
Annotations: sun.reflect.annotation.AnnotatedTypeFactory$AnnotatedParameterizedTypeImpl@12a3a380
Method Name: getvalues
Type: java.lang.String[][]
Annotations: sun.reflect.annotation.AnnotatedTypeFactory$AnnotatedArrayTypeImpl@29453f44
Method Name: getAddress
Type: java.lang.String[]
Annotations: sun.reflect.annotation.AnnotatedTypeFactory$AnnotatedArrayTypeImpl@5cad8086
Reference: https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/AnnotatedType.html
Last Updated :
05 Dec, 2018
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