Formatting Code in eclipse

Eclipse has one beautiful feature to create a new rule to format code in eclipse and then export the same set of rules in XML format and import the same set of rules(XML File) and hence supports quick formatting.
It is used for formatting indentation,braces,white spacing,blank lines,new line,control statement,line wrapping and comment section.

Steps to follow to create a set of rules for formatting the code according to your business requirements are described below:-

1. Go to Windows(Ctrl + W) -> Preferences(P).Now select Java -> Code Style -> Formatter.

   

   Formatting in Eclipse

2. Create a new profile.Click on new and give a name to your profile.

   

   Creating new Formatting Profile

3. Set the rules for formatting by checking the rules that you want to use in your application.

   

   Create rules for formatting

   For formatting the width,Select Line Wrapping and set maximum line width and set line breaking policy and indentation policy for Class Declarations,Constructor Declarations,Method declarations,enum Declarations,Function Calls,Expressions,Statements.After setting all the formatting rules,click on apply -> OK.You can see the code after formatting preview in the Preview of the setting.

   

   Line Wrapping rules for formatting

4. Click on Export in top right corner to export these settings.Give a name to the file and Click on Save.

   

   Export these Settings

5. To use these settings throughout the project team,import these settings by importing the XML file created above and click on Apply-> OK.
6. If you want this setting to be applicable for a particular project.Go to Project Properties,select Formatter from Java Code Style and click on the check-box Enable project specific settings.Select the Active Profile and click on Apply.

   

   Project Specific Formatting

7. Now to apply formatting to the code everytime you save a File,follow following process:-
   Under Preferences, choose Java -> Editor -> Save Actions. Check the "Perform the selected actions on save", and check the "Format source code" box.You can select the profile to be used for formatting from there.

Njoy...:)

Deployment in Tomcat Apache Server

1. Export the project in WAR file by selecting the project to deploy -> Export -> WAR file

   
   

   Export project as WAR

2. There are two ways to deploy WAR file in Apache Tomcat Server.First is through tomcat manager.The steps to deploy WAR from tomcat manager is described below:-
1.            Open tomcat-users.xml present at  appBase location(default appBase is "$CATALINA_BASE)/config or from eclipse go to server >Tomcat v6.0 Server at localhost-config and add user with manager role.For Ex:- Add the following line

   <user username="admin" password="admin" roles="manager"/>

   
   

   

   tomcat_users.xml

2. Start the tomcat server by executing startup.bat file present at bin folder of apache-tomcat.Open the Apache Manager by clicking http://localhost:8080 and select Tomcat Manager.   

   

   Apache tomcat manager

   Enter user name and password created using tomcat-users.xml.For our case it will be :-
   
   

   Username = “admin”
   
   
   Password=”admin"
3. Upload WAR file as shown below.
   

   

   Add WAR file

   
   
3. Deployment on Tomcat startup
   1. The location you deploy web applications to for this type of deployment is called the appBase which is specified per Host. Copy the WAR file to be deployed to appBase location.(default appBase is "$CATALINA_BASE/webapps").This method will work only if Host's deployOnStartup attribute is "true".

Creating new Profile in WAS

Creating and configuring Profile in WAS server with SCA Support

1.  First go to windows -> preferences


 


2.  Then Click on Server -> WebSphere Application Server





3.  Click on Run Profile Management Tool and select yes in the pop up box.You will get this window(If they above process doesn’t work,then go to C:\Program Files(x86)\IBM\SDP\runtimes\base_v7\bin\ProfileManagement and click on pmt.bat)





4.  Click on Launch Profile Management Tool. You will get the window shown below.





5.  Click on Create and Select Application Server and click on next.Again click on next.
6.  Uncheck the Enable Administrative Security(IF U DON'T WANT LOGIN USERNAME AND PASSWORD) and click on next.





7.  Click on create -> Finish and the new profile with AppSrv02 is created.
8.  Select the newly created profile and click on Augment 





9.  Add one by one all augments (Application Server with Feature Pack SCA must be included otherwise it won’t support SCA)

If you have any other problem in configuring WAS,feel free to ask or mail me @ adiadidas9000[at]gmail.com

DOS Tricks in JAVA

One of the most important DOS command is tasklist command.We can perceive this command in many ways.

"tasklist" is a DOS command that displays the running processes in the Windows OS.It displays all the applications and services running with their PID(process ID).


Syntax

tasklist[.exe] [/s computer] [/u domain\user [/p password]] [/fo {TABLE|LIST|CSV}] [/nh] [/fi FilterName [/fi FilterName2 [ ... ]]] [/m [ModuleName] | /svc | /v]

Parameters	Uses
/S system	Specifies the remote system to connect to.
/U [domain\]user	Specifies the user context under which the command should execute.
/P [password]	Specifies the password for the given user context. Prompts for input if omitted.
/M [module]	Lists all tasks currently using the given exe/dll name. If the module name is not specified all loaded modules are displayed.
/SVC	Displays services hosted in each process.
/V	Displays verbose task information.
/FI filter	Displays a set of tasks that match a given criteria specified by the filter.
/FO format	Specifies the output format. Valid values: "TABLE", "LIST", "CSV".
/NH	Specifies that the "Column Header" should not be displayed in the output. Valid only for "TABLE" and "CSV" formats.

Filters

Filter Name	Valid Operators	Valid values
STATUS	eq, ne	RUNNING | NOT RESPONDING | UNKNOWN
IMAGENAME	eq, ne	Image name
PID	eq, ne, gt, lt, ge, le	PID value
SESSION	eq, ne, gt, lt, ge, le	Session number
SESSIONNAME	eq, ne	Session name
CPUTIME	eq, ne, gt, lt, ge, le	CPU time in the format of hh:mm:ss.hh - hours,mm - minutesss - seconds
MEMUSAGE	eq, ne, gt, lt, ge, le	Memory usage in KB
USERNAME	eq, ne	User name in [domain\]user format
SERVICES	eq, ne	Service name
WINDOWTITLE	eq, ne	Window title
MODULES	eq, ne	DLL name

 


Now let us see how we can make utilization of this command with the help of some examples:-

•  tasklist /s Computer

Process info of local/remote System

• tasklist -v
• tasklist -fi

Filter Result of tasklist

• tasklist -v -fi "ImageName eq VLC.exe" /fo csv

To get VLC Windows Title

CODE SNIPPET to get current sound Track name in VLC

public String CallMe() {   Runtime runtime = Runtime.getRuntime();            String cmds[] = {"cmd", "/c", "tasklist","/v","/fi","ImageName eq VLC.exe","/fo","CSV"};            Process proc;            String val = null; try { proc = runtime.exec(cmds);            InputStream inputstream = proc.getInputStream();            InputStreamReader inputstreamreader = new InputStreamReader(inputstream);            BufferedReader bufferedreader = new BufferedReader(inputstreamreader);            String line;            int count = 0; while ((line = bufferedreader.readLine()) != null) {    if(count==1)    {    String[] a = line.split(","); val = a[9];    }    count++;    } } catch (IOException e) { e.printStackTrace(); } return val; }

This can be used to set curent soundtrack as your GTalk status by using SMACK api to communicate with GOOGLE.
This will be explained in more depth in my next Blog.

Three Sum Problem

A three sum problem is one in which sum of 3 numbers from a given inter array is zero.Find all pairs from the given array of n size along with the algorithm complexity.

A[i]+A[j]+A[k]=0

Approach

1) Sort the array

2) Loop i from 1 to n.

3)Initialize j to i and k to n-1

4)while k>j:do

• sum = a[i]+a[j]+a[k]
• if sum greater than zero increment j
• else decrement k

 Complexity :-O(n²)

For Eg:-
In JAVA,
The source code for ThreeSum problem will be:-

package com.collection.collection_ex; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.HashSet; import java.util.Set; public class ThreeSum { static Set<ArrayList<Integer>> l=new HashSet<ArrayList<Integer>>(); public static void main(String args[]) { int[] array = {2,7,6,-7,0,8,-3,-5,-1,7,-7,14}; System.out.println(threeSum(array)); System.out.println(threeSum(array).size()); } public static Set<ArrayList<Integer>> threeSum(int[] array) {    if(array == null) return null;    int n = array.length;    if(n < 3) return null;    Arrays.sort(array);    int count = 0;    for(int i = 0; i < n - 1; i++) {        int j = i ;        int k = n - 1;        while(k >j) {         count++;            int sum = array[i] + array[j] + array[k];            if(sum == 0)            {             ArrayList<Integer> s = new ArrayList<Integer>();                      s.add(array[i]);                      s.add(array[j]);                      s.add(array[k]);                      Collections.sort(s);                      l.add(s);            }                        if(sum < 0) j++; else k--;        }    }    return l; } }