1 /*

     2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 import java.lang.annotation.Annotation;

    26 import java.lang.reflect.Field;

    27 

    28 public class FieldAnnotationsApp {

    29     @MyAnnotation(name="myField1",  value="myValue1")

    30     public String myField1 = null;

    31 

    32     @MyAnnotation(name="myField2",  value="myValue2")

    33     public String myField2 = null;

    34 

    35     public static void main(String args[]) throws Exception {

    36         for (int i=1; i<=2; i++) {

    37             Field field = FieldAnnotationsApp.class.getField("myField" + i);

    38             Annotation[] annotations = field.getDeclaredAnnotations();

    39 

    40             for (Annotation anno : annotations){

    41                 if (anno instanceof MyAnnotation){

    42                     MyAnnotation myAnno = (MyAnnotation) anno;

    43                     String name = myAnno.name();

    44                     String value = myAnno.value();

    45 

    46                     System.out.println("Field         : " + field.getName());

    47                     System.out.println("  myAnno.name : " + name);

    48                     System.out.println("  myAnno.value: " + value);

    49 

    50                     if (!(name.equals("myField" + i) && value.equals("myValue" + i))) {

    51                         throw new Exception("Unexpected annotation values: " + i + " = " + value);

    52                     }

    53                 }

    54             }

    55         }

    56         System.out.println("Field annotations are OK.");

    57     }

    58 }