howto: print records from Hashtable?

[achana chan]

Hi.
This probably sounds like a silly question because it is one, but I don't know how to do it.
Here is the code which inserts records into a Hashtable

import java.util.Hashtable;
import java.util.Enumeration;
/**
 *  A TXRecord object encapsulates a transaction records
 */
public class TXRecord
{ // variables set at runtime by other applets...
  // public static TXRecord selfRef = null;
  private static Hashtable tbl_TXRecord = new Hashtable();
  //
  public static void insertTXRecord(String var_acctName,
                                    String var_unitCost)
  { tbl_TXRecord.put(var_acctName,
                     var_unitCost);
  }
  public static Enumeration getTXRecord() 
  { return tbl_TXRecord.elements();
  }
  public static int TXRecordSize()
  { return tbl_TXRecord.size();
  }
}

And here is the client applet code snippet which calls the insertTXRecord() public method to insert a records and then calls the getTXRecord() to try and print it (for testing only);

   { var_acctName = "blank account name";
     var_unitCost = "blank unit cost";
     try
     {
       txrecord.insertTXRecord(var_acctName, var_unitCost); // <- HERE
       System.out.println("TXRecord: " + txrecord.getTXRecord()); // <- HERE
     } catch (Exception exc) 
     { System.err.println("getApplet exception: " + exc.getCause());
       exc.printStackTrace();
     }
   } else if (aevt.getSource() == cancel) 
   { System.out.println("Test Cancelled");
     f.dispose();
   }

At the moment, Java console is giving me this output:

system datetime stamp: Mar 3, 2004 3:00:03 PM
TXRecord: java.util.Hashtable$Enumerator@1531164

which is not what I want and doesn't make much sense to me.
TIA :-)

[jeroen riezebeek]

 
public static Enumeration getTXRecord()   { return tbl_TXRecord.elements();  }
 

Returns Enumeration wich is a collection of the elements in the tbl_TXRecords.
To print these element.

  
  Enumeration enum = txrecord.getTXRecord();
  while (enum.hasMoreElements()){
    Hashtable table = (Hashtable)enum.nextElement();
    // some code to retreive the data from the single Hashtable object.
  }

[achana chan]

Hi. Thanks for taking time to look at my issue and for the code.

 { var_acctName = "blank account name";
   var_unitCost = "blank unit cost";
   try
   { txrecord.insertTXRecord(var_acctName, var_unitCost);
     System.out.println("TXRecord size: " + txrecord.TXRecordSize());
     // some code to retreive the data from the single Hashtable object.
     Enumeration enum = txrecord.getTXRecord();
     while (enum.hasMoreElements())
     { Hashtable table = (Hashtable)enum.nextElement();
     }

However Java console throws this runtime error:

system datetime stamp: Mar 3, 2004 6:34:58 PM
TXRecord size: 1
getApplet exception: null
java.lang.ClassCastException at ConfirmationFrame$prdDtlActionListener.actionPerformed(ConfirmationFrame.java:341)

It's complaining about casting enum.nextElement() as a Hashtable ?
TIA :-)

[achana chan]

But then, my technique doesn't work either

try
{ txrecord.insertTXRecord(var_acctName, var_unitCost);
  System.out.println("TXRecord size: " + txrecord.TXRecordSize());
  // some code to retreive the data from the single Hashtable object.
  Enumeration enum = txrecord.getTXRecord();
  Object obj;
  while (enum.hasMoreElements())
  { obj = enum.nextElement();
    System.out.println(obj + ": " + (Hashtable)txrecord.get(obj));
  }

Throws compile time error

cannot resolve symbol
method get(java.lang.Object)
class TXRecord
.........System.out.println(obj + ": " + (Hashtable)txrecord.get(obj));

Same old nemesis, canna resolve symbol... :-(