How do I import .jar and use its class and also how do i use stmt from a .jar file in netbeans?

Question

It's 1:37am here so I'm greeting you all a good day.

I've got a problem here and I'm really really new to java. Please have patience on me. :(

I've got a .jar file that I imported to my Libraries in my netbeans project. It's called dbconnect.jar. I want to create a statement in my Fruits.java that will change my stmt statement (from inside dbconnect.jar) to whatever mysql statement i want it to be (specifically, I want to add fruits to my db). Here's my project map:

So inside my dbconnect.jar contains the class Dbconnect . Here are the contents of Dbconnect :

package dbconnect;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;


public class Dbconnect {
    public Connection conn = null;
    public Statement stmt = null;
    public ResultSet rs = null;

public Dbconnect(){
    try{  
        Class.forName("com.mysql.jdbc.Driver").newInstance();  

        String Host = "jdbc:mysql://localhost/dbname";
        String Username = "root" ;
        String Password = "";

        conn = DriverManager.getConnection(Host, Username, Password);
        stmt = conn.createStatement();

        }catch(Exception e){
                 e.printStackTrace();
                   } 

    }    
}

By the way, I'm using xampp for Apache and Mysql.

So my questions are, how do I call/import this dbconnect.jar of mine so I can use it in Fruits.java (and if possible, am I able to use extends here?) and how do I make it so that I can edit the stmt part in dbconnect.jar using Fruits.java ?

This is currently what's inside the add button from my UI in Fruits.java:

I really need help with this. Thank you so much in advance! Oh and I'm still a starter. So I hope there will be no advanced codes. Thanks again!

And yes, I'm using JFrame. Here's what it looks like for now.

Answer 1

Since, you have Dbconnect.jar on your classpath you can just say something like this in your Fruit.java class:

Dbconnect db = new Dbconnect();

This will create a new object of Dbconnect class with name db .

In order for you to be able to edit the statement you'll have to create a new method and not just call it in the constructor.

Here is an example:

public void connect(String myStatement) {
    /* Do Something */
}

You can then call connect() function on db object you created before.