For keys of a map : HashMap « Collections Data Structure « Java

Home
Java
1.2D Graphics GUI
2.3D
3.Advanced Graphics
4.Ant
5.Apache Common
6.Chart
7.Class
8.Collections Data Structure
9.Data Type
10.Database SQL JDBC
11.Design Pattern
12.Development Class
13.EJB3
14.Email
15.Event
16.File Input Output
17.Game
18.Generics
19.GWT
20.Hibernate
21.I18N
22.J2EE
23.J2ME
24.JavaFX
25.JDK 6
26.JDK 7
27.JNDI LDAP
28.JPA
29.JSP
30.JSTL
31.Language Basics
32.Network Protocol
33.PDF RTF
34.Reflection
35.Regular Expressions
36.Scripting
37.Security
38.Servlets
39.Spring
40.Swing Components
41.Swing JFC
42.SWT JFace Eclipse
43.Threads
44.Tiny Application
45.Velocity
46.Web Services SOA
47.XML
Java » Collections Data Structure » HashMap 




For keys of a map
      

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class Main {
  public static void main(String[] argvthrows Exception {
    Map map = new HashMap();

    for (Iterator it = map.keySet().iterator(); it.hasNext();) {
      Object key = it.next();
    }
  }
}

   
    
    
    
    
    
  














Related examples in the same category
1.Iterate through the values of Java HashMap example
2.Get Synchronized Map from Java HashMap example
3.Check if a particular key exists in Java HashMap example
4.Check if a particular value exists in Java HashMap example
5.Get Set view of Keys from Java HashMap example
6.Get Size of Java HashMap
7.Remove all values from Java HashMap example
8.Remove value from Java HashMap
9.Create Java Hashtable from HashMap
10.Sort an HashMap based on the keys
11.For values of a map
12.For both the keys and values of a map
13.Storing Primitive Types in a Collection
14.Creating a Copy of a Collection: the objects are not cloned.
15.Use Iterator to loop through the map key set
16.Generic hashmap with String as key and Integer as valueGeneric hashmap with String as key and Integer as value
17.Get key set and value set from map and use Iterator to loop through them
18.Clones a map
19.Hash map for counting references to Object keys.
20.Extended Version of java.util.HashMap that provides an extended get method accpeting a default value.
21.Compact HashMap
22.This class wraps a HashMap and provides methods by which key objects can be associated with "counting" values.
23.This extension of HashMap support duplicate keys
24.Concurrent Hopscotch HashMap
java2s.com  | Contact Us | Privacy Policy
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.