dcsimg

What is the easiest way to obtain a Map Entry?

Created May 8, 2012

Brandon Rohlfs

The easiest way to obtain a Map Entry or (key-value pair) is by invoking the following method provided by the Map interface. 

Set<Map.Entry<K,V>> entrySet();

The entrySet() method returns a Set which is populated with Map.Entry objects. The only way to obtain a reference to a Map.Entry is by using an Iterator on the returned Set view. Once a reference to a Map.Entry is obtained the follow methods can be invoked which return the key and value corresponding to the entry.

K getKey()
V getValue()

import java.util.Map; 
import java.util.Set;
import java.util.TreeMap; 
import java.util.Iterator; 

public class Emps{
 public static void main(String[] args){
  Map<String,String> empmap = new TreeMap<String,String>();
  empmap.put("956544","Bob Jones");
  empmap.put("132485","Phil Harris");
  empmap.put("102161","Kamal Uganda");
  empmap.put("226545","Bill Russel");
  empmap.put("116423","Dorris Smith");
 
  Set s = empmap.entrySet();
  for(Iterator i = s.iterator();i.hasNext();){
   Map.Entry me = (Map.Entry)i.next();
   System.out.println(me.getKey() + " : " + me.getValue()); 
  }
 }
}