Java Class getDeclaredAnnotations()方法

java.lang.Class.getDeclaredAnnotations() 方法返回仅在方法上声明的注释，并忽略方法继承的注释。如果没有直接在方法上声明的注释，则返回的注释数组为空。返回数组的修改将不会影响返回给其他调用者的数组。当所有返回的批注数组由不同的调用方调用时，它们彼此独立。

1 语法

public Annotation[] getDeclaredAnnotations()

2 参数

无

3 返回值

该方法返回直接存在于此元素上的注释数组

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * Java Class getDeclaredAnnotations()方法
 */
import java.lang.annotation.Retention; 
import java.lang.annotation.RetentionPolicy; 
import java.lang.reflect.Method; 
import java.lang.annotation.Annotation; 
  
// create a custom Annotation 
@Retention(RetentionPolicy.RUNTIME) 
@interface customAnnotation { 
  
    // This annotation has two attributes. 
    public String key(); 
  
    public String value(); 
} 
  
// create the Main Class 
public class GFG { 
  
    // call Annotation for method and 
    // pass values for annotation 
    @customAnnotation(key = "AvengersLeader", 
                      value = "CaptainAmerica") 
    public static void
    getCustomAnnotation() 
    { 
  
        try { 
  
            // create class object for class name GFG 
            Class c = GFG.class; 
  
            // get method name getCustomAnnotation as Method object 
            Method[] methods = c.getMethods(); 
            Method method = null; 
            for (Method m : methods) { 
                if (m.getName().equals("getCustomAnnotation")) 
                    method = m; 
            } 
  
            // get an array of Annotations 
            Annotation[] annotation = method.getDeclaredAnnotations(); 
  
            // get annotation from the array of annotation 
            // and print the details 
            for (Annotation a : annotation) { 
  
                customAnnotation self = (customAnnotation)a; 
                // Print annotation attribute 
                System.out.println("Annotation details"); 
                System.out.println("key: " + self.key()); 
                System.out.println("value: " + self.value()); 
            } 
        } 
        catch (Exception e) { 
            e.printStackTrace(); 
        } 
    } 
  
    // create main method 
    public static void main(String args[]) 
    { 
        getCustomAnnotation(); 
    } 
}

输出结果为：

Annotation details
key: AvengersLeader
value: CaptainAmerica