Sometimes you need to work with map entry. This can be done using Map.Entry Interface of Java.
Map.Entry Java Interface
Sometimes you need to work with map entry. This can be done using Map.Entry Interface of Java.
The Map interface's entrySet( ) method returns a set of map . These sets are called as Map.Entry object.
Methods of Map.Entry Interface
Methods | Description |
boolean equals(Object obj) | Returns true, if Map.Entry object 's key -value is equal to the calling object |
Object getKey( ) | This method returns map entry's key. |
Object getValue( ) | This method returns map entry's value. |
int hashCode( ) | This method returns map entry's hash code. |
Object setValue(Object v) | This method sets the map entry's value to v. |
EXAMPLE
Given below example shows you how you can set map entry's value :
import java.util.*; public class MapEntryDemo { public static void main(String arghs[]) { HashMap hmp = new HashMap(); hmp.put("Neha", new Double(2424.34)); hmp.put("Niti", new Double(367.22)); hmp.put("Shivangi", new Double(4381.00)); hmp.put("Vinita", new Double(4761.22)); hmp.put("Sushmita", new Double(3904.08)); // Get a set of the entries Set set = hmp.entrySet(); // Get an iterator Iterator i = set.iterator(); // Display entries while (i.hasNext()) { Map.Entry me = (Map.Entry) i.next(); System.out.print(me.getKey() + ": "); System.out.println(me.getValue()); if (me.getKey().equals("Sushmita")) { me.setValue((Double) me.getValue() + 1000.00); System.out.println("Sushmita's new balance: " + me.getValue()); } } } }
OUTPUT :
Neha: 2424.34 Sushmita: 3904.08 Sushmita's new balance: 4904.08 Shivangi: 4381.0 Vinita: 4761.22 |