1 /* 2 * Copyright (c) 2017, 2019, 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 main(String args[])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 } 59