public class Person {

    // 编号

    private Long id;

    // 姓名

    private String name;

    public Person() {

    }

    public Person(Long id, String name) {

        this.id = id;

        this.name = name;

    }

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    @Override

    public String toString() {

        return "Person [id=" + id + ", name=" + name + "]";

    }

}

public class GenericClass {

    /**

     * 打印人员信息

     * @param persons

     */

    public void printPersonInfo(List<Person> persons) {

        for (Person person : persons) {

            System.out.println(person);

        }

    }

    /**

     * 获取人员列表

     * @return

     */

    public List<Person> getPersonList(){

        return new ArrayList<>();

    }

}

public class GetGenericType {

    public static void main(String[] args) throws Exception {

        GenericClass genericClass = new GenericClass();

        List<Person> persons = new ArrayList<>();

        persons.add(new Person(1L, "Jim"));

        genericClass.printPersonInfo(persons);

        System.out.println("Begin get GenericClass method printPersonInfo(List<Person> persons) paramter generic type");

        // 利用反射取到方法参数类型

        Method method = genericClass.getClass().getMethod("printPersonInfo", List.class);

        // 获取方法的参数列表

        Type[] paramTypes = method.getGenericParameterTypes();

        // 由于已知只有一个参数，所以这里取第一个参数类型

        ParameterizedType type = (ParameterizedType) paramTypes[0];

        // 获取参数的实际类型

        Type[] params = type.getActualTypeArguments();

        System.out.println("params[0] = " + params[0].getTypeName());

        System.out.println("End get GenericClass method printPersonInfo(List<Person> persons) paramter generic type");

    }

}