reflectiontester.java

基于netbeans的java桌面应用程序合集

package com.sun.tiger.annotation;

import java.io.IOException;
import java.io.PrintStream;
import java.lang.reflect.AnnotatedElement;
import java.lang.annotation.Annotation;

public class ReflectionTester {
    
    public ReflectionTester() {
    }
    
    public void testAnnotationPresent(PrintStream out) throws IOException {
        Class c = Super.class;
        boolean inProgress = c.isAnnotationPresent(InProgress.class);
        if (inProgress) {
            out.println("Super is In Progress");
        } else {
            out.println("Super is not In Progress");
        }
    }
    
    public void testInheritedAnnotation(PrintStream out) throws IOException {
        Class c = Sub.class;
        boolean inProgress = c.isAnnotationPresent(InProgress.class);
        if (inProgress) {
            out.println("Sub is In Progress");
        } else {
            out.println("Sub is not In Progress");
        }
    }
    
    public void testGetAnnotation(PrintStream out)
    throws IOException, NoSuchMethodException {
        
        Class c = AnnotationTester.class;
        AnnotatedElement element = c.getMethod("calculateInterest",
                float.class, float.class);
        
        GroupTODO groupTodo = element.getAnnotation(GroupTODO.class);
        String assignedTo = groupTodo.assignedTo();
        
        out.println("TODO Item on Annotation Tester is assigned to: '" +
                assignedTo + "'");
    }
    
    public void printAnnotations(AnnotatedElement e, PrintStream out)
    throws IOException {
        
        out.printf("Printing annotations for '%s'%n%n", e.toString());
        
        Annotation[] annotations = e.getAnnotations();
        for (Annotation a : annotations) {
            out.printf("    * Annotation '%s' found%n",
                    a.annotationType().getName());
        }
    }
    
    public static void main(String[] args) {
        try {
            ReflectionTester tester = new ReflectionTester();
            
//      tester.testAnnotationPresent(System.out);
    tester.testInheritedAnnotation(System.out);
            
//            tester.testGetAnnotation(System.out);
/*      Class c = AnnotationTester.class;
      AnnotatedElement element = c.getMethod("calculateInterest",
                                    float.class, float.class);
      tester.printAnnotations(element, System.out);
 */  } catch (Exception e) {
     e.printStackTrace();
 }
    }
}