Help regarding getting values based on keys in HashMap

[Avinash Sridhar]

Hello All,

This is how I am populating questions to the hashmap

quesAnsHash.put(counter++, question);

and this is how I am trying to get at the values for the keys and display them

  
 
               Set keys = quesAnsHash.keySet();
Iterator keyIter = keys.iterator();
while (keyIter.hasNext()){
Object key = keyIter.next();
Object value= quesAnsHash.get(key);
 

I am able to get the key. But i am not able to get the value corresponding to the key. What is it that is going wrong here?.

Please let me know. Help would be greatly appreciated.

Thanks

[Keith Lynn]

Could you tell us what happens?

[Avinash Sridhar]

Thanks for the response.

Only the keys are getting displayed, but the value corresponding to the keys are not getting displayed at all.

IS this information sufficient.

Thanks

[marc weber]

Originally posted by Avinash Sridhar:
...Only the keys are getting displayed, but the value corresponding to the keys are not getting displayed at all.

IS this information sufficient...

We would need to see the code that is supposed to be displaying these things. What you've shown should work...

import java.util.*;
 
class Hasher {
  public static void main(String[] args) {
    Map<Integer, String> quesAnsHash = new HashMap<Integer, String>();
    int counter = 1;
    quesAnsHash.put(counter++, "Question One");
    quesAnsHash.put(counter++, "Question Two");
 
    Set keys = quesAnsHash.keySet();
    Iterator keyIter = keys.iterator();
    while (keyIter.hasNext()) {
      Object key = keyIter.next();
      Object value = quesAnsHash.get(key);
      System.out.print("key is " + key);
      System.out.println(", and value is " + value);
    }
  }
}

[pete stein]

I hope order is not important.

[Avinash Sridhar]

Thanks for the replies, The order is important, and i have used LinkedHashMap. I got this to work. Thanks a lot for spending time over this.

avinash

[Campbell Ritchie]

You have managed to get a Set which only contains the keys. Look back in the API for HashMap and you should be able to find a set with entries in; go through the list of methods. You may have to click on the links to find other classes.

[edit]You seem to have got more help while I was writing this post.[/edit]
[ April 11, 2007: Message edited by: Campbell Ritchie ]