try{
    uniqueSubject2 = new ArrayList<>();
    Class.forName("com.mysql.jdbc.Driver");
    Connection con = DriverManager.getConnection("jdbc:mysql://(IPMYSQLSERVER)/(NAMA DATABASE)","(NAMA USER DB)","(PW USER DB)");
    Statement stmt = con.createStatement();
    String sql = "SELECT BLABLABAL SQL QUERY";
    ResultSet rs = stmt.executeQuery(sql);
    while(rs.next()) {
        String code=rs.getString(1);
        String section = rs.getString(2);
    }
    con.close();
}catch(Exception e){
    e.printStackTrace();
}