Breno Pimenta

Hi guys,
First topic, so I expect to be in the right place for questions.

So I'm making a simple java CRUD.
I made a first class called BaseDAO, that connects to the DataBase through JDBC.
(Any thoughts on making it better would help to)

public class BaseDAO { public BaseDAO() { try { Class.forName("com.mysql.cj.jdbc.Driver"); }catch(ClassNotFoundException e){ e.printStackTrace(); } } protected Connection getConnection() throws SQLException { String url = "jdbc:mysql://localhost/*****"; Connection conn = DriverManager.getConnection(url, "root", "*******"); return conn; } }

Then I'm about to call it in my next class, this method that I created (getConnection).
The problem is, what I would usualy do is, create a object of that class and then call the method on it. Like this:
BaseDAO db = new  BaseDAO; Connection conn = null; try{         conn = db.getConnection(); //...
It isnt working.


This is what is working:
Connection conn = null; try{         conn = getConnection(); //...

Can someone please explain to me, why I don't need to create a object BaseDAO?
And why in the second option I don't need to iniciate the Connection conn as "new Connection", and just as null?

double value = 0; double[] currency = {1.5, -30, 15, 21, -16, 12.5, 0}; for(int i = 0; i < currency.length; i++) {      //ADD ; betwen the condition and i++    if (value > currency[i]) value++;           //the array elements in loop are currency[i],   else if (value < currency[i]) value --;      //If there is just one simple operation inside the "if", is a good practice not creating a block }                                               //if the third option does nothing, you can just leave without nothing                                                // The answer should be 3.0

Sorry for the last coment, first time comenting  here.
Couldnt find a away to edit it yet.