Different ways to compare the java objects

Hi,
I want to compare rather search one object in collection of thousands of objects.
And now i am using the method which uses the unique id's of objects to compare. still that is too much time consuming operation in java.
so i want the better way to compare the objects giving me the high performance.

If you actually tried using a HashMap, and (if necessary) if you correctly implemented certain important methods in your class (this probably wasn't necessary but might have been), and if you used HashMap in a sane way and not an insane way, then you should be getting very fast search times.
So I conclude that one of the following is true:
1) you really didn't try using HashMap.
2) you tried using hashmap, but did so incorrectly (although it's actually pretty simple...)
3) your searches are pretty fast, and any sluggishness you're seeing is caused by something else.
4) your code isn't actually all that sluggish, but you assume it must be for some reason.
Message was edited by:
paulcw

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Compare two Java Objects without Comparable / Comparator

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I suppose you could design another feature to compare Objects... but that would involve a design process, so asking for sample code is definitely premature. And as EJP says, what would be the point?
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[svn:osmf:] 10124: Add a few variations of HelloWorld, showing the different ways of adding the DisplayObject to the Sprite.

Revision: 10124
Author:   [email protected]
Date:     2009-09-10 10:40:10 -0700 (Thu, 10 Sep 2009)
Log Message:
Add a few variations of HelloWorld, showing the different ways of adding the DisplayObject to the Sprite.
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SQL>
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go
dbcc freeproccache
go
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go
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SELECT usecounts, cacheobjtype, objtype, text
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go
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go
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go
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go
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go
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go
select * FROM [HumanResources].[vEmployeeDepartmentHistory]
go
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CROSS APPLY sys.dm_exec_sql_text(plan_handle)
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David http://blogs.msdn.com/b/dbrowne/

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<style type="text/css">
.ms-navedit-editLinksText{
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/*This script part will remove the default SharePoint Navigation & the Site Name Sections **/
ms-core-navigation {
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body{
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/* This CSS Snippet will style the Web Menu in the MasterPage. */
/* CSS Document */
/* =Reset default browser CSS. Based on work by Eric Meyer: http://meyerweb.com/eric/tools/css/reset/index.html
html,body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, font, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td {
border: 0;
font-family: inherit;
font-size: 100%;
font-style: inherit;
font-weight: inherit;
margin: 0;
outline: 0;
padding: 0;
vertical-align: baseline;
:focus {/* remember to define focus styles! */
outline: 0;
ol, ul {
list-style: none;
table {/* tables still need 'cellspacing="0"' in the markup */
border-collapse: separate;
border-spacing: 0;
caption, th, td {
font-weight: normal;
text-align: left;
blockquote:before, blockquote:after,
q:before, q:after {
content: "";
blockquote, q {
quotes: "" "";
a img {
border: 0;
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
display: block;
.clear {
clear: both;
h1 {
font-size: 18px;
h2 {
font-size: 16px;
/* Lay out design */
/************** start menu design *************/
#mainMenu {
width: relative;
height: 80px;
background: url(http://pc/PublishingImages/SitePages/Home/menu-bg.png) repeat-x;
#main-Menu ul {
padding-left:10px;
#main-Menu ul li{
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background-color: #4e34ee;
float: left;
display: block;
text-align: center;
margin-left: 5px;
-moz-border-radius: 0px;
-webkit-border-radius: 4px 4px 0px 0px;
border-radius: 4px 4px 0px 0px;
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ul.tabs
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border-radius: 6px 6px 0 0;
outline:none;
ul.tabs li a.tab3
font: normal 15px Calibri;
text-decoration: none;
padding: 16px 16px;
border: 0px solid #CCC;
border-bottom-color:#B7B7B7;
color: #000;
/*background: #F0F0F0 url(http://pc/PublishingImages/SitePages/Home/menu-sep.png) 0 0 repeat-x; */
background-color:#00adc6;
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outline:none;
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font: normal 15px Calibri;
text-decoration: none;
padding: 16px 16px;
border: 0px solid #CCC;
border-bottom-color:#B7B7B7;
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background-color:#00adc6;
border-radius: 6px 6px 0 0;
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text-decoration: none;
padding: 16px 16px;
border: 0px solid #CCC;
border-bottom-color:#B7B7B7;
color: #000;
/*background: #F0F0F0 url(http://pc/PublishingImages/SitePages/Home/menu-sep.png) 0 0 repeat-x; */
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border-radius: 4px 4px 0 0;
outline:none;
ul.tabs li a.tab6
font: normal 15px Calibri;
text-decoration: none;
padding: 16px 16px;
border: 0px solid #CCC;
border-bottom-color:#B7B7B7;
color: #000;
/*background: #F0F0F0 url(http://pc/PublishingImages/SitePages/Home/menu-sep.png) 0 0 repeat-x; */
background-color:#00aa9e;
border-radius: 6px 6px 0 0;
outline:none;
ul.tabs li a.tab7
font: normal 15px Calibri;
text-decoration: none;
padding: 16px 16px;
border: 0px solid #CCC;
border-bottom-color:#B7B7B7;
color: #000;
/*background: #F0F0F0 url(http://pc/PublishingImages/SitePages/Home/menu-sep.png) 0 0 repeat-x; */
background-color:#8dc63b;
border-radius: 6px 6px 0 0;
outline:none;
ul.tabs li a.tab8
font: normal 15px Calibri;
text-decoration: none;
padding: 16px 16px;
border: 0px solid #CCC;
border-bottom-color:#B7B7B7;
color: #000;
/*background: #F0F0F0 url(http://pc/PublishingImages/SitePages/Home/menu-sep.png) 0 0 repeat-x; */
background-color:#ab23cd;
border-radius: 6px 6px 0 0;
outline:none;
ul.tabs li a.tab9
font: normal 15px Calibri;
text-decoration: none;
padding: 16px 16px;
border: 0px solid #CCC;
border-bottom-color:#B7B7B7;
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ul.tabs li a:hover
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#sub2{ background: #00adef; }
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</style>
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<div id="mainMenu">
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I cannot figure the error I am facing. Could someone help me to solve this matter ?
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Regards,
Chiranthaka

I haven't seen this issue before. What I would do is, log in as each user then view the source of the page in the browser (right click the page and click "View Page Source" from the context menu, or use developer tools/firebug in the browser). Compare
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Hi,
I have a thread, test2.java, that periodically update a object that pass from test.java. In test.java, the "data" object need to be most updated coz this object is used in other thread also. I can ensure that only test2.java do the write, others threads are read only.
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Sorry nearly missed that :(
You should try to modify the instance of data you have been given in the constructor for test2 instead of creating a new object:
* This class will periodically update the "data" object that
* passed from test.java
public class test2 extends Thread {
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Is there a way to find the class objects memory size?

Hi Friends,
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Is there a way to find the number of Objects created and total size?
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class AgeRecord
int start;
int end;
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Thanks and Regards
JG

You might find this useful...
package forums;
http://weblogs.java.net/blog/dwalend/archive/2007/11/the_thing_about.html
http://forums.sun.com/thread.jspa?threadID=457279&start=30&tstart=0
http://www.velocityreviews.com/forums/t364574-size-of-boolean-type.html
The JLS doesn't specify the size of a boolean, leaving it upto the JVM
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999984 used=1000000 bytes
999985 used=1000000 bytes
999986 used=1000000 bytes
999987 used=1000000 bytes
999988 used=1000000 bytes
999989 used=1000008 bytes
999990 used=1000008 bytes
999991 used=1000008 bytes
999992 used=1000008 bytes
999993 used=1000008 bytes
999994 used=1000008 bytes
999995 used=1000008 bytes
999996 used=1000008 bytes
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999998 used=1000016 bytes
999999 used=1000016 bytes
1000000 used=1000016 bytes
1000001 used=1000016 bytes
1000002 used=1000016 bytes
1000003 used=1000016 bytes
1000004 used=1000016 bytes
1000005 used=1000024 bytes
1000006 used=1000024 bytes
1000007 used=1000024 bytes
1000008 used=1000024 bytes
1000009 used=1000024 bytes
1000010 used=1000024 bytes
1000011 used=1000024 bytes
1000012 used=1000024 bytes
1000013 used=1000032 bytes
1000014 used=1000032 bytes
1000015 used=1000032 bytes
ENVIRONMENT:
Microsoft Windows [Version 6.0.6000]
Copyright (c) 2006 Microsoft Corporation. All rights reserved.
C:\Users\Administrator>java -version
java version "1.6.0_12"
Java(TM) SE Runtime Environment (build 1.6.0_12-b04)
Java HotSpot(TM) Client VM (build 11.2-b01, mixed mode, sharing)
*/Cheers. Keith.

Different ways to compare the java objects

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