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1 Answer(s)      4 years and 6 months ago
Posted in : Java Beginners

If I have an object implementing the Map interface in Java and I wish to iterate over every pair contained within it, what is the most efficient way of going through the map either iterator or for each loop or for loop

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October 5, 2012 at 4:01 PM


Here is an example of HashMap.

import java.util.*;

public class HashMapExample{

  public static void main(String[] args){
    HashMap hm = new HashMap();
    hm.put(1,"A");
    hm.put(2,"B");
    hm.put(1,"C");
    hm.put(3,"D");
    hm.put(4,"E");

    Set set = hm.entrySet();

    Iterator i = set.iterator();

    while(i.hasNext()){
      Map.Entry me = (Map.Entry)i.next();
      System.out.println(me.getKey() + " : " + me.getValue() );
    }
  }
}









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