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Hashmap
alpesh.prajapati00's picture

hashmap

Submitted by alpesh.prajapati00 on Tue, 03/29/2011 - 18:11
how to compare hashmap with single character,,,...!!!!
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manuram's picture

java

Submitted by manuram on Mon, 03/14/2011 - 09:14
i want to override two methods from hashmap class to their extended class
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chris_lab's picture

HashMap nad Methods

Submitted by chris_lab on Thu, 02/03/2011 - 19:46
Hi I have a file customer.txt and it contains details of the customer.

in my programme i have an abstract class caled Customer which is extended by two subclasses OnlineCustomer and IndoorCustomer.

What i need to do is read the content of the file and store it in a HashMap. i need to use a method as the value of the HashMap

something like
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Andr's picture

Java HashMap Example

Submitted by Andr on Wed, 11/03/2010 - 15:42
1.8
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  1. import java.util.HashMap;
  2.  
  3. public class HashMapExample{
  4.  
  5.     public static void main(String[] args) {
  6.  
  7.         HashMap myMap = new HashMap();
  8.  
  9.         map.put("1", "A");
  10.         map.put("2", "B");
  11.         map.put("3", "C");
  12.  
  13.         String one = (String) map.get("1");
  14.         System.out.println(one);
  15.     }
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Andr's picture

Java HashMap Java Hashtable Difference

Submitted by Andr on Thu, 10/28/2010 - 00:10
4.5
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Java Hashtable and Java HashMap difference

1) Hashtable does not permit null keys while HashMap allows both null keys and values.

2) Hashtable is synchronized, while HashMap is not. If we need to synchronize it, we have to do it externally.

3) HashMaps work with Iterators where the older Hashtables work with Enumerations
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Andr's picture

Java HashMap Operations

Submitted by Andr on Thu, 10/28/2010 - 00:07
1.8
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Java HashMap Other operations

void putAll(Map map)
Copies all mappings from the map to current HashMap and replaces existing entries, if any.

Void clear()
Removes all mappings from HashMap.

Collection values()
Returns collection of the values contained in the HashMap.

Set entrySet()
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Andr's picture

Java HashMap Methods

Submitted by Andr on Thu, 10/28/2010 - 00:04
3.5
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HashMap Basic methods

Object get (Object key)
Returns the value mapped to the specified key, or null if no entry is found.

Object put (Object key, Object value)
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Andr's picture

HashMap Constructor

Submitted by Andr on Thu, 10/28/2010 - 00:02
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HahaMap Constructors

HashMap ()
Constructs empty HashMap with a default initial capacity 11 and load factor 0.75.

HashMap (int initialCapacity)
Constructs empty HashMap with the specified initial capacity and default load factor 0.75.

HashMap (int initialCapacity, float loadFactor)
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Andr's picture

HashMap, Java HashMap Tutorial

Submitted by Andr on Thu, 10/28/2010 - 00:00
3.166665
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Java Hashmap

A collection allows a group of objects to be treated as a single unit. Map is one of the core interfaces of java collection framework that defines operations for maintaining mappings of keys to values.
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Steven's picture

Hashmap get key

Submitted by Steven on Sat, 09/18/2010 - 17:00
How to get key from hashmap object? I have a hashmap which contains key value pairs and I want to get a particular key from my object. Is it possible to get key from Hashmap object?
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