通过反射获取实例化

package cn.itheima.web.servlet;

public interface IMyServlet {

    public void init();

    public void service();

    public void destory();
}

package cn.itheima.web.servlet;

public class MyServletImpl implements IMyServlet { 
   

    @Override
    public void init() {
        System.out.println("啊，俺来也……");
    }

    @Override
    public void service() {
        System.out.println("我可以为你服务……");
    }

    @Override
    public void destory() {
        System.out.println("啊，俺去也……");
    }

}

package cn.itheima.web.servlet;

import org.junit.Test;

public class TestMyServlet { 
   

    @Test
    public void testMyServlet(){
        MyServletImpl my = new MyServletImpl();
        my.init();
        my.service();
        my.destory();
    }

    @Test
    public void testMyServlet1(){
        try {
            String className = "cn.itheima.web.servlet.MyServletImpl";
            Class clazz = Class.forName(className);
            MyServletImpl my = (MyServletImpl) clazz.newInstance();
            my.init();
            my.service();
            my.destory();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}