public class database {

    public static String databaseName;
    public static String username;
    public static String password;
    public String tableName;
    public String schema;
    public String query;
    ResultSet rs;
    public static Connection dbconnection;

    public database(String databaseName, String username, String password) throws Exception {
        this.databaseName = databaseName;
        this.username = username;
        this.password = password;
    }

    public database() throws Exception{
        databaseName = "database";
        username = "admin";
        password = "12345";
        // TODO Auto-generated constructor stub
    }

    // Connect to selected Cache Database
    public static Connection connect() throws Exception {
        try {
            // Default port is 1972
            String url = "jdbc:Cache://127.0.0.1:1972/" + databaseName;
            Class.forName("com.intersys.jdbc.CacheDriver").newInstance();
            dbconnection = DriverManager.getConnection(url, username, password);
            System.out.println("Connected to " + databaseName + " database.");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return dbconnection;
    }
}

public class features {
    database db = new database();
    Connection conn = db.connect();
    ResultSet rs;
    Statement st = conn.createStatement();
}