jdbc文档的形式进行书写代码

package com.java.test1;
import java.security.interfaces.RSAKey;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import org.omg.PortableServer.ID_ASSIGNMENT_POLICY_ID;

public class JdbcTest2 {

public static void main(String[] args) {
	Connection connection = null;
	Statement st = null;
	ResultSet resultSet = null;
	
	//Driver driver = 
//1.注册驱动
	try {
		DriverManager.registerDriver(new com.mysql.jdbc.Driver());
		//建立连接 参数一 参数二  参数三
	connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student1", "root", "root");
    connection.createStatement();
    // 3创建statement,和数据库打交道一定需要这个对像
     st = connection.createStatement();	
    //4查询  
    String sql = "select *from list";
     resultSet = st.executeQuery(sql);
    while(resultSet.next()){
    	int id = resultSet.getInt("id");
    	String name = resultSet.getString("name");
    	String age = resultSet.getString("age");
    	//输出的上面变量接收的返回值
    	System.out.println("id="+id+"name="+name+"age="+age);
    	
    }
	} catch (SQLException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
		
		//第五步骤是严格按照jdbc的api格式进行书写代码的
	}finally {
		  //5.释放order 按照顺序进行释放
		if(resultSet != null){
	    try {
			resultSet.close();
			}
		catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	    resultSet = null;
		}
		if(st != null ){
	    try {
			st.close();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	    st = null;
		}
		
		if(connection != null){
	    try {
			connection.close();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	    connection = null;
		}
	}

	
}

}