connect to an in-memory database, you use the following connection string:
jdbc:sqLite::memory

public class Main {

    public static void main(String[] args) {
        try{
            Connection conn = DriverManager.getConnection("jdbc:sqlite:C:\Users\Owner\Desktop\School Project\Software-Engineering---Java-Project\Nati Elmaliach java\data.db");
            Statement statement = conn.createStatement();

            //CREATE TABLES
            statement.execute("CREATE TABLE IF NOT EXISTS CUSTOMERS (name TEXT,phone INTEGER,email TEXT)");

            //INSERT TO TABLES
            statement.execute("INSERT INTO CUSTOMERS (name,phone,email)" +
                    "VALUES ('NETANEL', 05555555,'SADF@GMAIL')");
            statement.execute("INSERT INTO CUSTOMERS (name,phone,email)" +
                    "VALUES ('BAR', 05554646,'RTGDG@GMAIL')");
            statement.execute("INSERT INTO CUSTOMERS (name,phone,email)" +
                    "VALUES ('TOMER', 055646541,'ASDQWE@GMAIL')");
            statement.execute("INSERT INTO CUSTOMERS (name,phone,email)" +
                    "VALUES ('LEIZY', 064646231,'ASD@GMAIL')");
```