通过Relect反射方法创建对象，获得对象的方法，输出对象信息

Posted 2020-10-15 越努力越幸运

package reflects;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

import io.Person;

//通过Relect反射方法创建对象，输出对象信息
public class ReflectDemo1 {

    public static void main(String[] args) {
        try {
            // 1、获得目标对象的类型
            Class cl = Class.forName("io.Person");
            // 2、获得对象的构造方法
            Constructor ct = cl.getDeclaredConstructor();
            // 3、创建对象
            Person p = (Person) ct.newInstance();
            // 4、获得对象的属性，赋值
            Field name = cl.getDeclaredField("name");
            Field age = cl.getDeclaredField("age");
            Field gender = cl.getDeclaredField("gender");
            // 5、设置属性访问权限，无论属性的访问修饰符是什么级别true表示可见
            name.setAccessible(true);
            age.setAccessible(true);
            gender.setAccessible(true);
            // 6、设置属性的值
            name.set(p, "Tom");
            age.set(p, 20);
            gender.set(p, "男");
            // 7、获得对象的方法
            Method mt = cl.getDeclaredMethod("toShow", String.class);
            // 8、通过反射调用p对象的toshow方法
            String st = (String) mt.invoke(p, "Refect反射");
            System.out.println(st);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
**********************************************************************************************
package io;

import java.io.Serializable;

//人类Person实现Serializable接口，实现序列化
public class Person implements Serializable {
    private String name;// 姓名
    private Integer age;// 年龄
    private String gender;// 性别

    public Person() {
    }

    public Person(String name, Integer age, String gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + ", gender=" + gender + "]";
    }

    public String toShow(String st) {
        return "通过" + st + "方法调用输出：Person [name=" + name + ", age=" + age + ", gender=" + gender + "]";
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + age;
        result = prime * result + ((gender == null) ? 0 : gender.hashCode());
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Person other = (Person) obj;
        if (age != other.age)
            return false;
        if (gender == null) {
            if (other.gender != null)
                return false;
        } else if (!gender.equals(other.gender))
            return false;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        return true;
    }

}