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7472686
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0
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0
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2011-09-19T14:40:50.393
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2011-09-19T14:40:50.393
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7471054
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Its possible use <code>getInterfaces()</code> on the class object and query the result. parameter annotation <pre><code>package mawi12345; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.PARAMETER) public @interface B { int version() default 0; } </code></pre> method annotation <pre><code>package mawi12345; import java.lang.annotation.ElementType; import java.lang.annotation.Inherited; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) @Inherited public @interface Revision { int minor() default 0; int major() default 1; } </code></pre> interface with annotations <pre><code>package mawi12345; public interface Foo { @Revision(minor=1, major=3) public void setMark(@B(version=3) int mark); } </code></pre> class with annotations and the Foo interface <pre><code>package mawi12345; public class Test implements Foo { public void setMark(int mark) { } @Revision(minor=2, major=4) public boolean isPassed() { return true; } } </code></pre> Test Class <pre><code>package mawi12345; import java.lang.annotation.Annotation; import java.lang.reflect.Method; public class ReflectionTest { public static void printAnnotations(Class<?> clazz) { // array of methods Method[] methods = clazz.getDeclaredMethods(); System.out.println("found "+methods.length+" methods"); for (int i=0; i<methods.length; i++) { // get the annotations of this method Annotation[] methodAnnotations = methods[i].getAnnotations(); // if you only wont to check for one annotation use getAnnotation(Class<T>) for (Annotation methodAnnotation : methodAnnotations) { System.out.println(methodAnnotation); } // get the parameter annotations (2d array) Annotation[][] parameterAnnotations = methods[i].getParameterAnnotations(); // get an array of parameters Class<?>[] parameters = methods[i].getParameterTypes(); for(int x=0; x<parameterAnnotations.length; x++) { Class<?> parameter = parameters[x]; for(Annotation annotation : parameterAnnotations[x]){ // print the parameter name and his annotation System.out.println(parameter.getName() + " " + annotation); } } } } /** * @param args */ public static void main(String[] args) { // create Test object Test test = new Test(); // get the class Class<?> clazz = test.getClass(); System.out.println("Class Test"); // print annotations printAnnotations(clazz); System.out.println(); // get the interfaces of the class Class<?>[] interfaces = clazz.getInterfaces(); System.out.println("found "+interfaces.length+" interfaces"); // print annotations for each interface for (Class<?> type : interfaces) { System.out.println(type); printAnnotations(type); } } } </code></pre> Output <pre><code>Class Test found 2 methods @mawi12345.Revision(minor=2, major=4) found 1 interfaces interface mawi12345.Foo found 1 methods @mawi12345.Revision(minor=1, major=3) int @mawi12345.B(version=3) </code></pre>
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