获取Class的信息

示?

public class Test08 {
    public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException, NoSuchMethodException {
        Class<?> aClass = Class.forName("com.fl.reflection.User");

        System.out.println("获取类的名称===========================================================================");
        System.out.println(aClass.getName());   //获得包名+类名
        System.out.println(aClass.getSimpleName()); //获得类名

        System.out.println("获取类的属性===========================================================================");
        Field[] fields = aClass.getFields();  //只能找到public属性
        for (Field field : fields) {
            System.out.println(field);
        }
        Field[] declaredFields = aClass.getDeclaredFields();    //找到全部属性
        for (Field declaredField : declaredFields) {
            System.out.println(declaredField);
        }

        System.out.println("获取指定属性===========================================================================");
        Field name = aClass.getDeclaredField("name");
        System.out.println(name);

        System.out.println("获取类的方法===========================================================================");
        Method[] methods = aClass.getMethods();     //获得本类及其父类的全部public方法
        for (Method method : methods) {
            System.out.println("getMethods:"+method);
        }
        methods = aClass.getDeclaredMethods();  //获得本类的所有方法
        for (Method method : methods) {
            System.out.println("getDeclaredMethods:"+method);
        }

        System.out.println("获得指定的方法*******************************************************************************");
        Method getName = aClass.getMethod("getName", null);
        Method setName = aClass.getMethod("setName", String.class);
        System.out.println(getName);
        System.out.println(setName);

        System.out.println("获得类的构造器*******************************************************************************");
        Constructor<?>[] constructors = aClass.getConstructors();
        for (Constructor< ? > constructor : constructors) {
            System.out.println("getConstructors:"+constructor);
        }
        constructors=aClass.getDeclaredConstructors();
        for (Constructor< ? > constructor : constructors) {
            System.out.println("getDeclaredConstructors:"+constructor);
        }
        System.out.println("获得指定的构造器*******************************************************************************");
        Constructor<?> declaredConstructor = aClass.getDeclaredConstructor(String.class, int.class, int.class);
        System.out.println(declaredConstructor);
    }
}