HashTables

[KimJack]

Hello All,

I really hope that someone can provide some assistance.

I have read a XML file into my hashtable. Next I created a second hashtable. If a key is located in my first hashtable, I want that key along with its value to be inserted into the second hashtable.

For example the code below: if hash contains the key "info" put the key "info" along with its value into hash2. However when it it displayed I want to display the value, which is the description.

for(int i = 0; i < 7; i++)
       {
           if(hash.containsKey(hash.get(info)))
                 {
                    hash2.put(hash.t.car[i].getName(), 
                    hash.t.car[i].getDescrip());
                              
                   }   
       }

This is done so when I try to remove a key I can just test for the key "info" and remove the value, which is description.

if(hash2.containsKey(info) )
         {
            hash2.remove(info);
         }

The problem is that when I try to "put" items into the hashtable they simply will not go into the hashtable. What am I doing wrong?

Any assistance will be greatly appreciated.

Thanks

[bugmenot]

if(hash.containsKey(hash.get(info)))

This line makes no sense; you are getting the value that is associated with the key "info", and then you are testing whether that value is a key in the hash table?

[KimJack]

How is this? I still have the same problem. It will not go into the hashtable.

for(int i = 0; i < 7; i++)
                        {
                          if(hash.containsKey(info))
                           {
                           hash2.put(hash.t.car[i].getName(), 
                           hash.t.car[i].getDescrip());
                                        
                           }
                        }

[KimJack]

The problem has to be with how I am using the put method. When I test the put method with simple strings it works fine.

[KimJack]

Well, I have made some progress. But it still will not "remove" the item from the hashtable.

this is how I used the put method:

hash2.put(hash.get(info), hash.getDescrip());

However when I use the remove method it will not remove the info from the hashtable.

Any suggestions?

Thank you,

[bugmenot]

can we see more code? for example, what types are all these things? how are they defined?

[KimJack]

All are type Objects with the exception of "info", which is a String read from user input. Of course hash and hash2 represents the hash tables.