delete values from a hastable

[ben riches]

hello everyone i hope someone can help
i have the code below
which tests if any strings are the same to print them out plus there key values
but now i want to able to delete the values and the key names that have already been used
can anyone help please
thanks
loftty

import java.io.*;
import java.util.*;
import java.lang.*;
public class Has {
   public static void main(String[] args) {
 
      ArrayList arr = new ArrayList();
      Hashtable hash = new Hashtable();
      String st; //column names
      String s;
      String p;
      String t;
      String st1 = new String("ben");
      String st2 = new String("alex"); //table names
      String st3 = new String("ben");
      String st4 = new String("ben");
      hash.put(st = "hello", st1);
      hash.put(t = "hehe", st2);
      hash.put(s = "id", st3);
      hash.put(p = "great", st4);
 
      Enumeration e = hash.keys();
      while (e.hasMoreElements()) {
         String key = (String)e.nextElement();
         String se = (String) hash.get(key);
 
         if (se.equals(st1)){
            System.out.println(se+"\n"+key);
         }
         if (se.equals(st2)){
            System.out.println(se+"\n"+key);
         }
      }
   }
}

[ December 09, 2002: Message edited by: Michael Ernest ]

[Jim Yingst]

It you want to remove values from the Hashtable while you're looping through it, use an Iterator rather than an Enumeration (as shown in my other post), and use the remove() method of the Iterator. Otherwise you can use the remove(Object) method of Hashtable, where the argument is the key value to be removed. But don't do this while you're looping through the Hashtable - it confuses things.
[ December 09, 2002: Message edited by: Jim Yingst ]

[Ted Striker]

Jim, I posted a HashMap question below and your response to Ben's post has my attention.
I want to take two hashmaps, iterate through each one and remove the hashmap elements that do not match keys. I was recommended an interfact (Coparable) solution but I am trying to make it simpler. How can I iterate through two hashmaps simultaneously while removing elements that don't match? You mention not removing elements while looping. I don't understand. Please see my post re: data structures.
Ted

[Jim Yingst]

I replied here.