java反射-获取类的属性、构造方法、方法

public class UserInfo {
 
    private long id;
    private String username;
    private String password;
 
    public UserInfo() {
        System.out.println("public UserInfo()");
    }
 
    public UserInfo(long id) {
        super();
        this.id = id;
    }
 
    public UserInfo(long id, String username) {
        super();
        this.id = id;
        this.username = username;
    }
 
    public UserInfo(long id, String username, String password) {
        super();
        this.id = id;
        this.username = username;
        this.password = password;
        System.out.println("public UserInfo(long id, String username, String password)");
        System.out.println(id + " " + username + " " + password);
 
    }
 
    public long getId() {
        return id;
    }
 
    public void setId(long id) {
        this.id = id;
    }
 
    public String getUsername() {
        return username;
    }
 
    public void setUsername(String username) {
        this.username = username;
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
 
    public void test() {
        System.out.println("public void test1()");
    }
 
    public void test(String address) {
        System.out.println("public void test2(String address) address=" + address);
    }
 
    public String test(int age) {
        System.out.println("public String test3(int age) age=" + age);
        return "我是返回值";
    }
}

 public static void main(String[] args) throws IOException, ClassNotFoundException {
        //通过类获取Class对象
        Class<UserInfo> userInfoClass = UserInfo.class;
        System.out.println("属性列表：");
        //    获取属性列表
        Field[] declaredFields = userInfoClass.getDeclaredFields();
        for (Field declaredField : declaredFields) {
            System.out.println(declaredField.getName());
        }
        System.out.println("构造方法：");
        //    获取构造方法
        Constructor<?>[] constructors = userInfoClass.getConstructors();
        for (Constructor<?> constructor : constructors) {
            Class<?>[] parameterTypes = constructor.getParameterTypes();
            System.out.println(constructor.getName()+"参数数量："+ parameterTypes.length+"参数类型："+ Arrays.toString(parameterTypes));
        }
        System.out.println("方法：");
        //    获取方法
        Method[] declaredMethods = userInfoClass.getDeclaredMethods();
        for (Method declaredMethod : declaredMethods) {
            System.out.println(declaredMethod);
        }
    }