Java反射的几个小实例

//显示父类和所有接口

	public static void showSuperclassAndInterface(String className){

		try {

			Class<?> clazz=Class.forName(className);

			System.out.println(className+"的父类是：\n"+clazz.getSuperclass().getName());

			

			System.out.println("\n"+className+"所包含的接口有：");

			Class<?>[] interfaces=clazz.getInterfaces();

			for(Class<?> i:interfaces){

				System.out.println(i.getName());

			}

		} catch (ClassNotFoundException e) {

			e.printStackTrace();

		}

	}

	

	//显示此类中所有set方法

	public static Method[] showSetMethod(String className){

		List<Method> list=new ArrayList<Method>();

		try {

			Class<?> clazz = Class.forName(className);

			Method[] methods=clazz.getMethods();

			for(Method m:methods){

				if(m.getName().indexOf("set")==0){

					list.add(m);

				}

			}

		} catch (ClassNotFoundException e) {

			e.printStackTrace();

		}

		return list.toArray(new Method[list.size()]);

	}



	//显示所有属性的值

	public static void showAllPropertyValue(Object bean){

		Class<?> clazz=bean.getClass();

		

		Method[] methods=clazz.getMethods();

		

		List<Method> list=new ArrayList<Method>();

		

		for(Method m:methods){

			if(m.getName().indexOf("get")==0){

				list.add(m);

			}

		}

		

		for(Method m:list){

			try {

				System.out.println(m.getName().substring(3)+"屬性的值是："+m.invoke(bean, null));

			} catch (IllegalArgumentException e) {

				e.printStackTrace();

			} catch (IllegalAccessException e) {

				e.printStackTrace();

			} catch (InvocationTargetException e) {

				e.printStackTrace();

			}

		}

		

	}

	

	public static void main(String[] args) {

		//showSuperclassAndInterface("java.util.ArrayList");

		/*for(Method m : showSetMethod("Student")){

			System.out.println(m.getName());

		}*/

		Student student=new Student();

		student.setName("張三");

		student.setAge(22);

		

		showAllPropertyValue(student);