package com.imooc.reflect;


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

public class Test {
    public static void main(String[] args) {
        try {

            Class goodsClass= Class.forName("com.imooc.reflect.Goods");
            Constructor goodsConstructor=goodsClass.getConstructor(new Class[]{String.class, String.class, float.class, String.class});
            Goods goods=(Goods)goodsConstructor.newInstance(new Object[]{"001", "mooc手机", 3999f, "6.58英寸大屏，超长待机"});
            System.out.println(goods);
            Method displayMethod=goodsClass.getMethod("display", String.class);
            String newDesp = "6.58英寸大屏，超长待机，超级快充，6400万高清四摄";
            displayMethod.invoke(goods,newDesp);
            System.out.println(goods);
        } catch (ClassNotFoundException | NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

    }
}

package com.imooc.reflect;

public class Goods {
    private String id;
    private String name;
    private float price;
    private String desp;

    public Goods(){

    }

    public Goods(String id, String name, float price, String desp) {
        this.id = id;
        this.name = name;
        this.price = price;
        this.desp = desp;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }

    public String getDesp() {
        return desp;
    }

    public void setDesp(String desp) {
        this.desp = desp;
    }

    @Override
    public String toString() {
        return "Goods{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", price=" + price +
                ", desp='" + desp + '\'' +
                '}';
    }

    public void display(String desp) {
        this.setDesp(desp);
        System.out.println(this.getName()+"商品描述更改为："+desp);
    }
}

​