public static void main(String[] args) throws Exception {
Class<ClassTest> clazz = ClassTest.class;
System.out.println("=============================================");
Constructor[] ctors = clazz.getDeclaredConstructors();
System.out.println("classTest的全部构造器如下：");
for (Constructor c : ctors) {
System.out.println(c);
}
System.out.println("=============================================");
Constructor[] publicCtors = clazz.getConstructors();
System.out.println("ClassTest的全部public构造器如下：");
for (Constructor c : publicCtors) {
System.out.println(c);
}
System.out.println("=============================================");
Method[] mtds = clazz.getMethods();
System.out.println("ClassTest的全部public方法如下：");
for (Method md : mtds) {
System.out.println(md);
}
System.out.println("=============================================");
System.out.println("ClassTest带一个字符串参数的info方法为：" + clazz.getMethod("info", String.class));
Annotation[] ans = clazz.getAnnotations();
System.out.println("ClassTest的全部annotation为：");
for (Annotation an : ans) {
System.out.println(an);
}
System.out.println("该元素上的@SuppressWarnings注释为：" + clazz.getAnnotation(SuppressWarnings.class));
System.out.println("=============================================");
Class<?>[] inners = clazz.getDeclaredClasses();
System.out.println("ClassTest的全部内部类如下：");
for (Class c : inners) {
System.out.println(c);
}
System.out.println("=============================================");
Class inClazz = Class.forName("ClassTest$Inner");
System.out.println("inClazz对应的外部类为：" + inClazz.getDeclaringClass());
System.out.println("ClassTest的包为：" + clazz.getPackage());
System.out.println("ClassTest的父类：" + clazz.getSuperclass());
}
public static <T extends Annotation> T digAnnotation(
Class<?> target, Class<T> annotationType, List<Class<? extends Annotation>> visited) {
T result = target.getAnnotation(annotationType);
if (result == null) {
for (Annotation a : target.getAnnotations()) {
if (!visited.contains(a.annotationType())) {
visited.add(a.annotationType());
result = digAnnotation(a.annotationType(), annotationType, visited);
if (result != null) {
return result;
}
}
}
}
return result;
}
protected void loadClassDependencies(Class aClass) throws ClassNotFoundException {
String name = aClass.getName();
if (myVisited.add(aClass)) {
try {
for (Method method : aClass.getDeclaredMethods()) {
loadTypeDependencies(method.getGenericReturnType());
for (Type type : method.getGenericExceptionTypes()) {
loadTypeDependencies(type);
}
for (Type type : method.getGenericParameterTypes()) {
loadTypeDependencies(type);
}
}
for (Constructor method : aClass.getDeclaredConstructors()) {
for (Type type : method.getGenericExceptionTypes()) {
loadTypeDependencies(type);
}
for (Type type : method.getGenericParameterTypes()) {
loadTypeDependencies(type);
}
}
for (Field field : aClass.getDeclaredFields()) {
loadTypeDependencies(field.getGenericType());
}
Type superclass = aClass.getGenericSuperclass();
if (superclass != null) {
loadClassDependencies(aClass);
}
for (Type intf : aClass.getGenericInterfaces()) {
loadTypeDependencies(intf);
}
aClass.getAnnotations();
Package aPackage = aClass.getPackage();
if (aPackage != null) {
aPackage.getAnnotations();
}
} catch (LinkageError e) {
throw new ClassNotFoundException(name);
} catch (TypeNotPresentException e) {
throw new ClassNotFoundException(name);
}
}
}