Java Method getParameterAnnotations () Method

The getParameterAnnotations () method of Method class returns an array of arrays of Annotations that represent the annotations on the formal parameters, in declaration order, of the Executable represented by this object. An array of length Zero will be returned if has no parameters is passed.

Syntax

Parameter

No parameter is passed.

Returns

An array of arrays representing the annotations on the formal and implicit.

Throw

Example 1

 //import statement
import java.lang.annotation.*;  //import annotation class of lang package
import java.lang.reflect.Method;  //import Method class of reflect package
import java.util.Arrays;

public class ReflectMethodgetParameterAnnotationsExample1 {
    public void Display(@DisplayConf Object config,
                            @Deprecated @INDEX int n) {}

    public static void main(String... args) throws NoSuchMethodException {
        Method mthd = ReflectMethodgetParameterAnnotationsExample1.class.getDeclaredMethod("Display",Object.class, int.class);
        Annotation[][] prm = mthd.getParameterAnnotations();  
        System.out.println(Arrays.deepToString(prm));
        for (Annotation[] an : prm) {
            for (Annotation ann : an) {
                System.out.println(ann);  //print statement
            }
        }
    }

    @Target({ElementType.PARAMETER})
    @Retention(RetentionPolicy.RUNTIME)  //retention policy
    private @interface INDEX {}

    @Target({ElementType.PARAMETER})
    @Retention(RetentionPolicy.RUNTIME)
    private @interface DisplayConf{}
}

Test it Now

Output:

[[@ReflectMethodgetParameterAnnotationsExample1$DisplayConf()], 
[@java.lang.Deprecated(), @ReflectMethodgetParameterAnnotationsExample1$INDEX()]]
@ReflectMethodgetParameterAnnotationsExample1$DisplayConf()
@java.lang.Deprecated()
@ReflectMethodgetParameterAnnotationsExample1$INDEX()

Example 2

import java.lang.annotation.*; //import annotation class of lang package
import java.lang.reflect.Method;  //import Method class of reflect package
import java.util.Arrays;

public class ReflectMethodgetParameterAnnotationsExample2  {

    public void Display(@Displayconf Object config) {}

    public static void main(String... args) throws NoSuchMethodException {
        Method mthd = ReflectMethodgetParameterAnnotationsExample2.class.getDeclaredMethod("Display", Object.class);
        Annotation[][] prm = mthd.getParameterAnnotations();
        System.out.println(Arrays.toString(prm)); //print statement
    }

    @Target({ElementType.PARAMETER})  //set target element type
    @Retention(RetentionPolicy.RUNTIME)  //retention policy
    private @interface Displayconf {}
}

Test it Now

Output:

[[Ljava.lang.annotation.Annotation;@677327b6]

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