Javaeeリフレクションでクラスオブジェクトを取得する3つの方法

リフレクションの一般的な説明、po のプロパティとメソッドはクラス オブジェクトを通じて取得されます。

package com.test.classobject;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.test.pojo.Student;

/**
 * Servlet implementation class TestServlet
 */
@WebServlet("/TestServlet")
public class TestServlet extends HttpServlet {
    
    
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public TestServlet() {
    
    
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
		// TODO Auto-generated method stub
		try {
    
    
			//方式1 ： 通过完全限定名 获得Class对象  
			Class clazz=Class.forName("com.test.pojo.Student");
			
			//根据Class对象创建stuent对象 
			Student student=  (Student) clazz.newInstance();
			
			//方式2：
			Class clazz2=  Student.class;
			Student student2=  (Student) clazz2.newInstance();
			
			//方式3
			Student student3=new Student();
			
			Class clazz3=student3.getClass();
			
			
			
		} catch (ClassNotFoundException e) {
    
    
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InstantiationException e) {
    
    
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
    
    
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}