Hasttable

What is the problem with this code. Can anyone please help...
new Hashtable(){
this.put("characteristic",new String("path.bandwidth.achivevable.TCP"));
};

I doubt this is recommended practice, but it does run:
import java.util.Hashtable;
public class HashTest {
     Hashtable myHashtable = new Hashtable(){
            { // NOTE EXTRA SET OF BRACES
               this.put("characteristic",new String("path.bandwidth.achivevable.TCP"));
            } // END EXTRA SET OF BRACES
   public static void main(String[] args)
      System.out.println(new HashTest().myHashtable);
}The extra set of braces puts the "this.put(...)" into an "instance initializer" that runs when the Hashtable instance is created--so the "put" gets run, and the output of the program does show that Hashtable contains the specified data.
But, I would do as Nick suggested and do the "put" separately.

Similar Messages

What is HastTable String, Object ?

Hello
I am new to HashTables and I have a bit of code that I don't understand.
private Hashtable<String, CalendarEvent> events = new Hashtable<String, CalendarEvent>();CalendarEvent is a class

Not sure exactly what you're asking, but my guess is it's related to Generics. They allow you to control the types of objects that a collection can hold, or what types can be passed to a method, or various other type-related tasks. Google "java generics" for more info.
With a HashMap, there's a key and a value. If you want the key to be a String, and the Value to be an Integer, you could say:
HashMap<String,Integer> myMap = new HashMap<String,Integer>();Or if you want an ArrayList to hold objects of type Widget:
ArrayList<Widget> myList = new ArrayList<Widget>();

Inserting Hashtable into a BLOB column..

Hi,
Iam trying to store a hashtable object into a BLOB column..when i try to retrieve
from hte blob column i get the following exception
StreamCorruptedException:out of range is 0

I could insert into database successfully,while retrieving I got this exception.
I could able to insert and retrieve anyother java objects except Hashtable and
HashMap...
also I tried putting Hasttable into a Vector..that also didn'
t work.
thanks in advance.
Muthu
public void conn(){
ht.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
ht.put(Context.PROVIDER_URL,"t3://localhost:7001");
          try {
               ctx = new InitialContext(ht);
               javax.sql.DataSource ds = (javax.sql.DataSource) ctx.lookup ("WorkFlowDataSource");
               java.sql.Connection connection = ds.getConnection();
          connection.setAutoCommit(false);
          Statement statement = connection.createStatement();
          rs = statement.executeQuery("select blob_data from test for update");
          while (rs.next()) {
                    myRegularBlob = rs.getBlob("blob_data");
          OutputStream os = ((weblogic.jdbc.common.OracleBlob)myRegularBlob).getBinaryOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(os);
          Hashtable hash = new Hashtable();
          hash.put("1","111111111hgfdhgkdkvalue");
          oos.writeObject(hash);
          oos.flush();
          connection.commit();
          System.out.println("Object inserted into persistence..");
          rs.close();
          statement.close();
          } catch(Exception ex){
               ex.printStackTrace();
          retrieve();
          public void retrieve(){
          try {
                    ctx = new InitialContext(ht);
                    javax.sql.DataSource ds = (javax.sql.DataSource) ctx.lookup ("WorkFlowDataSource");
                    java.sql.Connection connection = ds.getConnection();
                    Statement statement = connection.createStatement();
                    rs = statement.executeQuery("select blob_data from test ");
          while (rs.next()) {
          myRegularBlob = rs.getBlob("blob_data");
          ObjectInputStream oos1 = new ObjectInputStream(os1);
          Hashtable sections = (Hashtable)oos1.readObject();
          System.out.println("Obj retrieved..\n"+sections);
          statement.close();
          rs.close();
          connection.close();
     } catch(Exception ex){
          ex.printStackTrace();
"Slava Imeshev" <[email protected]> wrote:
Muthu,
could you show us how you write/read the hashtable?
Regards,
Slava Imeshev
"Muthu" <[email protected]> wrote in message
news:[email protected]...
Hi,
Iam trying to store a hashtable object into a BLOB column..when i tryto
retrieve
from hte blob column i get the following exception
StreamCorruptedException:out of range is 0

Loading Properties in memory !

Hi All !,
Is there a way in which I can store all my properties from a file say(xyz.properties) into memory in the form of a java Object like a HashMap or HastTable so that I can have reference to it through out my application.I am trying do this because I want to manipulate properties couple of times in my application.Any suggestions!!
Sample source code would be really helpful
Thanks!
sash

I think it was a stupid question..anyways
thanks
sash

Hasttable

Similar Messages

Maybe you are looking for