Importing java files in another java program

[smyle khanna]

Hi...
I have 2 java programs in which one inherits the other.i used the import statement to inherit the other file in the other..but its givin errors..
i tried creating packages and also tried but all in vain...
the object of the first class declared is not accepted in the second one.
it gives the following errorS:

VAS_Conn.java:11: cannot resolve symbol
symbol  : class ConnectionPool
location: class VAS_Conn
public class VAS_Conn extends ConnectionPool
                              ^
VAS_Conn.java:13: cannot resolve symbol
symbol  : class ConnectionPool
location: class VAS_Conn
        public Connection getConnect(ConnectionPool cPool)
                                     ^
VAS_Conn.java:23: cannot resolve symbol
symbol  : class ConnectionPool
location: class VAS_Conn
        public void returnConnect(ConnectionPool cPool, Connection con)

the code of 2 programs r given below

import java.sql.*;
import java.util.*;
 
public class ConnectionPool
{
  private Hashtable connections;
  private int initialConnections = 20, increment = 10, maximum = 50;
  private String driverClassName = "sun.jdbc.odbc.JdbcOdbcDriver", 
      dbURL = "jdbc:odbc:VAS", user = "Users", password = "smitha";
 
  //public ConnectionPool(String dbURL, String user, String password, 
  // String driverClassName, int initialConnections, int increment) 
  // throws SQLException, ClassNotFoundException
  public ConnectionPool() throws SQLException, ClassNotFoundException
  {
    Class.forName(driverClassName);
//this.dbURL=dbURL;
//this.user=user;
//this.password=password;
//this.increment=increment;
 
    connections = new Hashtable();
 
    for (int i = 0; i < initialConnections; i++)
    {
      connections.put(DriverManager.getConnection(dbURL, user, password), 
          Boolean.FALSE);
    }
  }
 
  public Connection getConnection() throws SQLException
  {
    Connection con = null;
    Enumeration cons = connections.keys();
 
    synchronized (connections)
    {
      while (cons.hasMoreElements())
      {
        con = (Connection)cons.nextElement();
        Boolean b = (Boolean)connections.get(con);
        if (b == Boolean.FALSE)
        {
          try
          {
            con.setAutoCommit(true);
          }
          catch (SQLException e)
          {
            con = DriverManager.getConnection(dbURL, user, password);
          }
          connections.put(con, Boolean.TRUE);
          return con;
        }
      }
    }
 
    for (int i = 0; i < increment && connections.size() + 
        increment <= maximum; i++)
    {
      connections.put(DriverManager.getConnection(dbURL, user, password),
          Boolean.FALSE);
    }
    return getConnection();
  }
 
  public void returnConnection(Connection returned)
  {
    Connection con;
    Enumeration cons = connections.keys();
    while (cons.hasMoreElements())
    {
      con = (Connection)cons.nextElement();
      if (con == returned)
      {
        connections.put(con, Boolean.FALSE);
        break;
      }
    }
  }
}

import java.sql.*;
import java.text.*;
import java.util.*;
import pool.*;
 
public class VAS_Conn extends ConnectionPool
{
  public Connection getConnect(ConnectionPool cPool)
  {
    Connection con = null;
    try
    {
      con = cPool.getConnection();
    }
    catch (Exception e)
    {
      System.out.println(e);
    }
    return con;
  } 
 
  public void returnConnect(ConnectionPool cPool, Connection con)
  {
    try
    {
      cPool.returnConnection(con);
    }
    catch (Exception e)
    {
      System.out.println(e);
    }
  }
}

plz help me out......
[ edited to break long lines, disable smilies, and to remove the evil tab character -ds ]
[ April 12, 2004: Message edited by: Dirk Schreckmann ]

[jamma jacob]

hI
sMYLE
Put both in the same directory without package and compile.Find Out
Whether it works and what is this 'import pool.*' Is connectionPool in it
If it is where is the package name in connectionpool

Check it out

[Layne Lund]

I have found it tricky to get my own packages and imports to work correctly. I strongly suggest you follow the suggestion made by "red bull" and put all your java files in one directory and not worry about import statements. Get it to compile that way before you start organizing your packages.
When you get that much to work, make sure each java file has a line such as:
package pool;
This will define the package that should contain the classes in that file. Also, these files should all be in a subdirectory (or folder) named "pool".
Finally, you will need to add the folder that contains this pool folder to your CLASSPATH. If you put your source files in a directory called C:\my_java_files\pool, then you need to add C:\my_java_files to the CLASSPATH variable in order to allow import statements to find the appropriate package and its classes.
HTH
Layne
p.s. Someone, please correct me if I've made any mistakes above.
p.p.s. RED BULL: you should change your name to follow the naming policy before a Sheriff arrests you ;-)

[Dirk Schreckmann]

red bull,
Welcome to JavaRanch!
We ain't got many rules 'round these parts, but we do got one. Please change your display name to comply with The JavaRanch Naming Policy.
Thanks Pardner! Hope to see you 'round the Ranch!

[Dirk Schreckmann]

smyle khanna,
Your code almost compiles.
If you remove the import pool.*; statement, then you'll discover that your only remaining problem concerns not handling the thrown exceptions of the ConnectionPool constructor in your subclass constructor.
To fix that, you could just add a no argument constructor to your subclass that throws the same exceptions.
Now, for help on figuring out the whole "how to get my packages and imports to work thing", let me recommend reading a few past conversations on the subject, which include some step-by-step instructions.

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[smyle khanna]

Hi DIRK..
Thanks a lot..my program is running fine without creating any packages ...
smyle