Java中的import

例:package servlet;  import javax.naming.Context; import javax.sql.DataSource; import javax.naming.InitialContext; //import org.apache.log4j.Logger; import org.apache.*; import java.sql.*; public  class Dbconn{  //private static Logger log=Logger.getLogger(Dbconn.class);  public static Connection conn = null;  public Context initCtx = null;  public static  Connection getConn() {    try {     conn = DriverManager.getConnection("proxool.cityrcPool");     if(conn==null){System.out.print("+++++++++++++++++++++++");}else{      System.out.print("________________________");     }     //log.info("============获取Connection===========");    } catch (Exception e) {     //log.info("============不能获取Connectiot========");     e.printStackTrace();    }    finally{    }    return conn;   }}我在另一个类中:import servlet.*;我就可以调用了:Connection con=Dbcon.getConn()