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Make A JAR File
JAR files are Java's version of ZIP files. In fact, JAR uses the ZIP file format. There are two main uses for JAR files which I shall explain here. The first use is to compress (make a smaller size) a number of files into one file (archiving). The second use is to make a Java executable JAR file.- Compress Files To A Java Archive (JAR)
- Common Examples
- Compress Files To An Executable Java Archive (JAR)
- Create An Executable JAR
- Running An Executable JAR From Command Line
- Running An Executable JAR From Explorer (Windows)
- Further Resources
Compress Files To A Java Archive (JAR)
This is by far the most common use for JAR files: to compress multiple files into a single JAR archive. JAR files can be opened with WinZip or WinRar. In terms of Java applications, the ability to archive any number of source or class files into one single archive represents the biggest advantage - distributing one file containing hundreds of files is so much easier than distributing hundreds of files separately!The jar utility program is run from the command line (DOS prompt or bash for example, depending on your OS). Here is how to create a compressed JAR file:
jar cf archive_name.jar files
Let's look at each part of that command line.jarThe command to run the jar utility.
CFCreate a new archive with the file name specified. These two options are from this list of common options:
- c create new archive
- t list table of contents for archive
- x extract named (or all) files from archive
- u update existing archive
- v generate verbose output on standard output
- f specify archive file name
- m include manifest information from specified manifest file
- 0 store only; use no ZIP compression
- M do not create a manifest file for the entries
- i generate index information for the specified jar files
- C change to the specified directory and include the following file
Multiple options can be used together. They all must appear after the "jar" command with no white space separating them.
archive_name.jarName of the JAR file. This can only be included if you use the 'f' option.
filesNames of all the files you want to put in the jar file. This could be just one name or a list of multiple names separated by space. Names can use pattern matching characters to match multiple files.
Common Examples
Let's say I have a Java application consisting of three source files that I wish to distribute:One.java Two.java Three.javaI also want to call my JAR file example.jar. To make a JAR file with just One.java:
jar CF example.jar One.java
To make a file with all three files listed separately: jar CF example.jar One.java Two.java Three.java
To make a file with all three files using a pattern match: jar CF example.jar *.java
It goes (almost) without saying that the source files are in the same directory you are running the jar command in.Compress Files To An Executable Java Archive (JAR)
It is also possible to make an archive that can be executed (run) by Java and even by a double click through your OS, if you have it set up correctly. Of course, to do this you must store compiled class files in the archive, as well as or instead of Java source files, since Java source files cannot be run!Continuing the example above, I now compile my Java source files:
javac *Java
or javac One.java Two.java Three.java
Create An Executable JAR
All JAR files contain something called a manifest file which holds information Java wants to know. One piece of information a manifest file may contain is the name of a class that will be run if the JAR file is executed.The first thing you must do is create a text file that lists the "main" class - the class that has the main method you want executed when the JAR is executed. Let's say that Three from the above example has the main method I want executed. I create a text file called "mainClass.txt" with the following text:
Main-Class: Three
IMPORTANT: the text file only needs the one line of text for this purpose. However, the file must end with a blank line or this will not work, ie the file has two lines in it - the second one is empty. Note too the class is called "Three" and not "Three.java" (the file containing the source code) or "Three.class" (the file containing the byte codes). If your class file is in a package hierarchy, you must use the fully qualified name of the class (eg "myPackage.MyClass").
I then run the jar utility with this command line:
jar cmf mainClass.txt example.jar *.class
With this line, I told jar to create a JAR file (option c) with modifications to the manifest file (option m) as specified within mainClass.txt, naming the JAR file (option f) as example.jar and including everything that matches the pattern *ClassRunning An Executable JAR From Command Line
I can run it from the command line like this: java -jar example.jar
Running An Executable JAR From Explorer (Windows)
Within Windows, it is also possible to set up Windows Explorer so that you can double click on the JAR file icon to execute the file (handy for GUI applications). The first thing you must do is set up the correct association with the 'javaw.exe' application that JDK for Windows will have. Click here for an older example with pictures! Open Windows Explorer and select Tools | Folder Options | File Types.If there is no JAR file type, create it. Give it a description like
jar - Executable Jar File
to ensure it sorts under 'jar'. Create or edit the action called "open" and associate it with the following action: "C:\Java\jdk1.4.0\bin\javaw.exe" -jar "%1"
Of course, you will replace "C:\Java\jdk1.4.0\bin\javaw.exe" with whatever path is correct on your machine.IMPORTANT: include the double quotes to take care of names with spaces.
If you are using something other than Windows and you know how to set up an association in your OS, please contact me.
Further Resources
Java's Tutorial on Jar files:http://java.sun.com/docs/books/tutorial/jar/
Roedy Green's JAR file page:
http://www.mindprod.com/jglossjar.html#JAR
Facebook Flowers Symbol:
❀ ✿ ❁ ✾
Chess black facebook symbols :
♚ ♛ ♜ ♝ ♞ ♟
Zodiac symbols for facebook
♈ – Aries (The Ram)
♉ – Taurus (The bull)
♊ – Gemini (The Twins)
♋ – Cancer (The Crab)
♌ – Leo (The Lion)
♍ – Virgo (The Virgin)
♎ – Libra (The Scales)
♏ – Scorpio (The Scorpion)
♐ – Sagittarius (Centaur The Archer)
♑ – Capricorn (Goat-horned, The sea goat)
♒ – Aquarius (The water bearer)
♓ – Pisces (The fish)
♫ = Big musical note
♥ = Black heart
☺= Smile face
☻ = Black smile face
There are two ways for use this facebook symbols.
1. Copy from here and paste in your facebook name, status or message.
2. These facebook symbols can be typed on your keyboard using the ALT button.
Desktop computer instructions for ALT facebook symbols:
• Press and hold left Alt key on your keyboard.
• While holding Alt key enter one of the codes below to get the corresponding facebook symbol.
• Important note: You need to use numbers on the right side of the keyboard for entering code, not the numbers on top, otherwise they won’t work.
Laptop instructions for ALT facebook symbols:
• Press and hold left Alt key on your keyboard.
• While holding Alt key also press and hold Fn key.
• While holding Alt and Fn key enter one of the codes below to get corresponding facebook symbol.
• Important note: You need to use numbers that are usually written next to letters U, I, O… and in different color, not the numbers on top, otherwise they won’t work.
Alt + 1 ☺
Alt + 2 ☻
Alt + 3 ♥
Alt + 4 ♦
Alt + 5 ♣
Alt + 6 ♠
Alt + 7 •
Alt + 8 ◘
Alt + 9 ○
Alt + 10 ◙
Alt + 11 ♂
Alt + 12 ♀
Alt + 13 ♪
Alt + 14 ♫
Alt + 15 ☼
Alt + 16 ►
Alt + 17 ◄
Alt + 18 ↕
Alt + 19 ‼
Alt + 20 ¶
Alt + 21 §
Alt + 22 ▬
Alt + 23 ↨
Alt + 24 ↑
Alt + 25 ↓
Alt + 26 →
Alt + 27 ←
Alt + 28 ∟
Alt + 29 ↔
Alt + 30 ▲
Alt + 31 ▼
The Best Notepad Tricks for Windows
Top 10 Notepad Tricks You Have Never seen!! Amazing Notepad Tricks for Windows.
If you press F5 in notepad, it will insert current date and time in the file. I think most of us know about this notepad trick. It is also mentioned in the Edit menu of the notepad.
Notepad isn't really that bad. It is a age old app, but it's still popular because of its simplicity.
Now I am going to show some fun notepad tricks. Enjoy these cool tricks.
Bush may have hid the facts. But whether or not he did, this trick looks really weird. According to the trick it really seems Microsoft had put some hack into the coding of notepad making the text hidden after saving it.
Open notepad.
Type BUSH HID THE FACTS
Save that file.
Close Notepad
Open the file again (with notepad like before)
Can you read it back?
Why This Happens ?
It was later known 4335 Rule. It means that if we enter four words separated by spaces, wherein the first word has 4 letters, the next two have three letters each, and the last word has five letters. Then Notepad Automatically hides the text into unknown code. Similar are with "this app can break".
Open notepad and type in:
@echo off
color 2
:start
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
goto start
Save it as matrix.bat
Double click on file and it will open the matrix
Open your Notepad
Type the flight number i.e Q33N in Capital Letters.
Increase the Font Size to 72
Change the Font to Wingdings
You will be amazed by the findings. Its a Plane going for 2 building shaped structures & then death. (see below) WTF ?
Type in: msg * Error: Your system is affected by virus
Save as "virus.bat"
Now open that .bat file, now you got error message window
Its not virus, just your assumption message.
Open Notepad
Then recopy the following character string in the Notepad:
X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*
Now save it and scan it by ur antivirus software..
If your antivirus is correctly activated, it must then alert you instantaneously presence of the Eicar virus.
Then ask your antivirus to remove the file. In my case I had installed BitDefender Anti Virus and file was recognize and removed automatically without any additional action from me.
If your antivirus does not see anything, than you have a problem. It could be because of two reasons: permanent protection is badly configured or there were some problems during antivirus installation. Then you have to read documentation of your software to correct this problem.
If the false virus is still not detected, you must then seriously think of changing anti-virus software.
Here is the trick :
Consider you want to lock a folder named PICS in your D:\ , whose path is D:\PICS
Now open the Notepad and type the following
ren pics pics.{21EC2020-3AEA-1069-A2DD-08002B30309D}
Where pics is your folder name. Save the text file as lock.bat in the same drive.
Open another new notepad text file and type the following
ren pics.{21EC2020-3AEA-1069-A2DD-08002B30309D} pics
Save the text file as key.bat in the same drive.
Usage :
To lock the pics folder, simply click the loc.bat and it will transform into control panel icon which is inaccessible.
To unlock the folder click the key.bat file. Thus the folder will be unlocked and the contents are accessible.
Code : 01001011000111110010010101010101010000011111100000
Save As it as .EXE and any Name would Do.
Make an Ethical use of it. This .exe file can be really dangerous.
To get the Windows XP CD key, you have to do the following steps.
1. Bring your Windows XP CD and insert it into your computer's CD/DVD ROM/ RAM.
2. Now, browse your Windows XP CD and find the folder I386.
3. Inside I386 folder, find the file named as unattended.txt.
4. Open unattended.txt by using notepad.
5. At last, keep scrolling of the opened file and you will get Windows XP CD key.
To me, it’s the most amazing thing of Windows XP CD. In this way, you can get the Windows XP CD key into your Windows XP CD. The people who are not wish to buy XP or the people who lost the serial key of Windows XP CD, can find theWindows XP CD key in this way.
Whenever you open the file with that text in the first line in the notepad, it will insert the current date and time at the end of the file. You can start entering your text after that.
Hope these tricks were useful for you.
Do you have questions, comments, or suggestions? Feel free to post a comment!
How to use Trial Version software forever without Expiration
There are a lot of sharewere softwares and games that are available for download as a trial version. But we really get annoyed when these trial versions expire after a fixed period of time and you need to enter a serial number to continue using the software. Previously i posted tutorials "How To Get Cracks and Serials to Any Program using Craagle" and "Top Sites to Find All the Serials You Need". The bad thing is that there are softwares that is hard to find a serial numbers for them, like System Mechanic or BitDefender, thats when you should use a program which is able to freeze a trial versions, so you can use your software indefinitely forever. You can tell trial version of the software to not count days or do not bother about time. The software will stay and keep working like original software forever and will not expire or cease to work.
Here is the list of my top softwares that will stop time of each trial version software:
1. Time Stopper
Time Stopper is a software which can stop a time for try out version software. When you stop the time you can use your try-out versions forever. When you stop the time of a try-out version using this Time Stopper it works via this Time Stopper. Real time and date run normally on your system. You can use any number of try-out version softwares with this software.
How it Works?
* Open Time Stopper
* Browse and select .exe of required trial software
* Choose the new date (Any date which occurs in between your trial software time period before expiration, suggestion: set it to two days before trial software expiration date).
* Choose any time
* Click open software on your selected date
If you wish to create an icon for your modified trial software and do not want to open Time stopper every time then use last button in software to create new icon. open that trial software after that from that newly created icon always otherwise it can expire.
Download Time Stopper | Size: 844 KB
2. RunAsDate
RunAsDate is a small utility that allows you to run a program in the date and time that you specify. This utility doesn't change the current system date and time of your computer, but it only injects the date/time that you specify into the desired application.
You can run multiple applications simultaneously, each application works with different date and time, while the real date/time of your system continues to run normally.
How does it work ?
RunAsDate intercepts the kernel API calls that returns the current date and time (GetSystemTime, GetLocalTime, GetSystemTimeAsFileTime), and replaces the current date/time with the date/time that you
Download RunAsDate | Size: 21.3 KB
3. Date Cracker 2000
Date Cracker 2000 is a program which removes the date protection from programs which expire after a specific date. It is most useful for shareware or trial versions of software. Note that this program should be used for educational purposes only. Another interesting software developed allows you to remove passwords from MS Access '95 or '97 MDB files.
Software like Date Cracker 2000 helps two kinds of people.
Software Users...........
Software Developers...
Software Users are benefited by a great extent because they can use a shareware or trial version of a software indefinitely. This means that most software which expire after a certain date can be used well after that date (almost indefinitely). The key is to run the software via Date Cracker 2000 when you get a demo / trial version of any software.
Software Developers should be aware of such programs (trust me, they are!). They must devise better algorithms so that their software will be protected better. But the fact is, most software developers do not mind their software (Trial versions/ Demo's) being run by such programs....while some developers cannot do anything about their software after releasing it. But they can ensure that later versions of their software should have better date protection. Of course, there will be always be a newer version of Date Cracker 2000.
How it Works?
* Start by opening Date Cracker
* Click Add
* Enter the description for your program
* Click the [...] button at the bottom of the screen
* Search for the executable file of the trial program
* Set the Simulated Run Date past the trial expiration date
* Click Run
That’s it, you’re now on your way to using your favorite trials hassle free.
A Few Tips:
The key is to run the software via Date Cracker when you run a trial for the first time.
Dates should be entered in full e.g. 2090/06/30
Download Date Cracker 2000 | Size: 1.5 MB
Do you have questions, comments, or suggestions? Feel free to post a comment!
from: www.computerzone2010.blogspot.com
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