* Class对象功能：

	* 获取功能：

		1. 获取成员变量们

			* Field[] getFields() ：获取所有public修饰的成员变量

			* Field getField(String name)   获取指定名称的 public修饰的成员变量

			* Field[] getDeclaredFields()  获取所有的成员变量，不考虑修饰符

			* Field getDeclaredField(String name)

		2. 获取构造方法们

			* Constructor<?>[] getConstructors()

			* Constructor<T> getConstructor(类<?>... parameterTypes)  

			* Constructor<T> getDeclaredConstructor(类<?>... parameterTypes)

			* Constructor<?>[] getDeclaredConstructors()

		3. 获取成员方法们：

			* Method[] getMethods()

			* Method getMethod(String name, 类<?>... parameterTypes)  

			* Method[] getDeclaredMethods()

			* Method getDeclaredMethod(String name, 类<?>... parameterTypes)  

		4. 获取全类名

			* String getName()

public class Person {

    private String name;

    private int age;

    public String a;

    public Person() {

    }

    public Person(String name, int age) {

        this.name = name;

        this.age = age;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    @Override

    public String toString() {

        return "Person{" +

                "name='" + name + '\'' +

                ", age=" + age +

                ", a='" + a + '\'' +

                '}';

    public void eat() {

        System.out.println("eat...");

    }

    public void eat(String food) {

        System.out.println("eat..." + food);

        }

    }

import domain.Person;

import java.lang.reflect.Field;

public class ReflectDemo2 {

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

        //0、获取Person的Class对象

        Class personClass = Person.class;

        //1、Field[] getFields()

        Field[] fields = personClass.getFields();

        for (Field field : fields) {

            System.out.println(field);

        }

        System.out.println("--------");

        //Field getField(String name)

        Field a = personClass.getField("a");

        //获取成员变量a的值

        Person p = new Person();

        Object value = a.get(p);

        System.out.println(value);

        //设置a的值

        a.set(p,"张三");

        System.out.println(p);

        System.out.println("##################");

        //Field[] getDeclaredFields(),获取所有的成员变量，不考虑修饰符

        Field[] declaredFields = personClass.getDeclaredFields();

        for(Field decl : declaredFields){

            System.out.println(decl);

        }

        //Field getDeclaredField(String name)

        Field d = personClass.getDeclaredField("age");

        //忽略访问权限修饰符的安全检查

        d.setAccessible(true);//暴力反射

        Object value2 = d.get(p);

        System.out.println(value2);

    }

}