Iterating the Map
Hi there
I am using a HashMap and I put some data in the map and I then get the data from the map with get(). However, I found that the order I get the object is in reverse order of the order that I put the data in the map. I just want to know if I can get the object from the map in the same order as I put the data.
Thanks for your help!
From
Edmund
When you iterate on a HashMap (Hashtable, HashSet...), you're actually getting them in pseudorandom order; that is, in the order of the modulo of object's hashCode value.
Neither Maps nor Sets inheritently preserve the "input" order of their elements. If you need to do that, you'll have to use a List (LinkedList, Vector, ArrayList...)
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Is there a way to overload the Map's toString() function?
Hello everyone. I was wondering if its possible to overload the toString() function of the Map datastructure supplied by java.
I looked it up and it says:
public class HashMapextends AbstractMapSo I looked up AbstractMap and it says:
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toString
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here: http://java.sun.com/j2se/1.3/docs/a...ml#toString()So I did the following:
package parse;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.io.*;
//this class should store all the Messages or "Events" and
//you can access them based on their EntityID key.
public class MessageDB extends HashMap
//database to hold the information
// holds the Alerts/messages
public static Map<Integer, List<String>> AlertMap;
//Constructor
MessageDB()
AlertMap = new HashMap<Integer, List<String>>();
public String toString()
return ( )//not sure what to put here...
//print, outputs the contents of the hashMap
public static void print()
//want to print out the Key and all the Messages
//associated with that key
Set keys = AlertMap.keySet(); // The set of keys in the map.
Iterator keyIter = keys.iterator();
System.out.println("The map contains the following associations:");
while (keyIter.hasNext()) {
Object key = keyIter.next(); // Get the next key.
Object value = AlertMap.get(key); // Get the value for that key.
System.out.println( "EntityID: " + key + "\n"
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//overloaded print to print to user screen.
public static void print(PrintWriter out)
//want to print out the Key and all the Messages
//associated with that key
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Iterator keyIter = keys.iterator();
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while (keyIter.hasNext()) {
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//out.flush();
/* out.println( " (" + key + "," + value + ")" );
out.flush();*/
// out.println("------------------\n");
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//out.println("------------------\n");
out.flush();
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else
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Alert.add(msg.message);
}Right now the output is like this:
The map contains the following associations:
EntityID: 99999
Message: [a test ]
EntityID: 800
Message: [this is a test , again a test ]
EntityID: 801
Message: [again a test ]
EntityID: 111
Message: [a test again yes , a test once again ]You see how its automatically doing [message1, message2,...,message x]
By me calling this line of code:
out.println("EntityID: " + key + "\n"
+ "Message: " + value + "\n");Because I found out it implicity calls the toString() method when concatinating it to a string.
What I would like it to display would be:
EntityID: 800
Message:
This is a test
This is a test again
any ideas would be great!
Or is there a way to just iterate over the messages, rather than doing it my way?
Message was edited by:
lokieHi,
When you do a String concatenation in java, calls are implicitly done to #toString().
Means, you are doing this:
while (keyIter.hasNext()) {
Object key = keyIter.next(); /
Object value = AlertMap.get(key);
System.out.println( "EntityID: " + key.toString()+ "\n"
+ "Message: " + value.toString() + "\n" );
}The "[ [/b]... [b], ... , ... ]" you can see in your output is created by the implicit call to List#toString() method.
You can Override it in an anonymous class by doing:
if (Alert == null)
//if there isnt a key in the map, add a new key, and a new List mapping
//to the key EntityID;
Alert = new ArrayList<String>(){
@Override
public String toString(){
StringBuilder sb = new StringBuilder();
for(String s: this){
sb.append(s);
sb.append("\n");
return sb.toString();
};PS:
toString() is usually used for debbuging only... -
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COPY_OF_ORG_FINAL_MAPPING
Create
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Name
Action
Status
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None
INFORMATIONAL
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COPY_OF_ORG_FINAL_MAPPING
Create
Warning
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Edited by: Steve Duan on Feb 23, 2009 8:52 AM??
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Post relates to: Centro (AT&T)
Message Edited by WyreNut on 02-20-2009 12:18 PM
I am a Volunteer here, not employed by HP.
You too can become an HP Expert! Details HERE!
If my post has helped you, click the Kudos Thumbs up!
If it solved your issue, Click the "Accept as Solution" button so others can benefit from the question you asked! -
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I'm working on a demo with BWGIS. I encounter several problems with the MAP web item.
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QA results visualized on global (region object - e.g. Europe, Asia), country (country object) and plant level. Use geo-drilldown to navigate into the lower layers functionality to get from the global view to the countries within one region and plants within one country.
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alt. other ?
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With kind regards,
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I am working on the same topic. I am strongly interessted in solutions to your open questions, that you pulled forward in the past.
Did you make any progress?
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