Example on Map.Entry methods

[Chandra Bhatt]

hi!

If anybody of you could give any example of using methods of the Map.Entry;

K getKey();
V getValue();
V setValue(V new);

entrySet() is method of the Map.

I am not getting how to use those methods in association with the Set returned by the Map.

Thanks,
cmbhatt

[marc weber]

import java.util.*;
 
class MapDemo {
  public static void main(String[] args) {
 
    //create a Map for id numbers (Integers) and names (Strings)...
    Map<Integer, String> map = new HashMap<Integer, String>();
 
    //put data into Map...
    map.put(1234, "Maddin");
    map.put(5678, "Egoyan");
    map.put(9012, "Quay");
 
    //here's my Map (keys and values)...
    System.out.println("Original Map: " + map);
 
    //get a Set of Map.Entry instances, where
    //each Map.Entry has a key (Integer) and a value (String)...
    Set<Map.Entry<Integer, String>> setOfEntries = map.entrySet();
 
    //here's my Set (Map.Entry instances)...
    System.out.println("Original Set: " + setOfEntries);
 
    //for each Map.Entry in the Set, print the id and name...
    //then change the name to "Khanjian"...
    for(Map.Entry<Integer, String> entry : setOfEntries) {
      System.out.println(" Key: " + entry.getKey());
      System.out.println(" Value: " + entry.getValue());
      entry.setValue("Khanjian");
    }
 
    //now here's my revised Set (with the names changed)...
    System.out.println("Revised Set: " + setOfEntries);
 
    //and the revised Map...
    System.out.println("Map: " + map);
  }
}

[Chandra Bhatt]

I got it Marc!





Thank you so much!