How to create a jar file using eclipse in 3 easy steps

A jar file is a Java ARchive file that contains many java .class files as well as other resource files in a compressed format.
It is similar to a tar or zip format.

Here are three simple steps with illustrations to create your jar file in Eclipse IDE.

Step 1 : Create your java class(es)

I have written a java class HelloWorld.java in Eclipse in a package called HelloWorld as shown below.

Step 2 : Choose the export file format

Now I want to put entire project in a jar file.
Right-click on the package and select export.

Now select under Java icon JAR as shown.

Step 3 : Specify the jar file name and location

I give the jar file name as C:\amol\HelloWorld.jar as shown

I check 'Export generated class files and Resources' and 'compress the contents of jar file' checkboxes.
Thats it.
Now just click finish and your jar file will be created at the given location.

CGTUXEU3CDMS

Comments

How to remotly debug java program using Eclipse

Eclipse provides a facility to debug your java programs remotely. To demonstrate how you can remotely debug java programs remotely, I will do the following: Create a .bat file that calls the java program Configure the arguments to the JVM so that the JVM will be capable of being remotely debugged Configure Eclipse to connect to the remote JVM 1. Create a bat file calling the java program I create a java class given below: public class RemoteDebugDemo { public static void main(String[] args) { System.out.println("STEP 1"); System.out.println("STEP 2"); System.out.println("STEP 3"); System.out.println("STEP 4"); System.out.println("STEP 5"); System.out.println("STEP 6"); } } Now I wish to run this program in batch mode.So I write a file called RemoteDebugDemo.bat file with following content. java -jar RemoteDebugDemo.jar I create a jar file named RemoteDebugDe...

How to convert a CSV file to XLSX

I wrote this utility for a friend of mine who wanted to convert large (~50MB) CSV files to XLSX. The CSV files had comma "," as a delimiter. I have used apache poi utility in this program. https://www.apache.org/dyn/closer.lua/poi/release/RELEASE-NOTES.txt This code uses SXSSFWorkbook class. The SXSSFWorkbook class uses "BigGridDemo" strategy, where only portions being processed are kept in memory. There are temporary files created which store the rest of the temporary data. setCompressTempFiles() method allows these temp files to be compressed. The size of these files can get quite large. The data to be converted was UTF-8 encoded data. So, we are using OutputStreamWriter, where we specify the encoding of the data. If you do not need the encoding, just remove that parameter from the constructor call of OutputStreamWriter. The system where this ran, supported Java 7, so have not used features in java 8, such as try with exceptions. import java.io.*; im...

How to detect browser closing events and warn user before closing

Recently I came across this problem.I was creating a web application where users were supposed to save their work before logging out.While testing, it turned out that many users closed their browsers instead of logging out. To solve this, I googled the problem and found out that this was a very common problem. I just used below java script code in my webpage's header. Q. How to detect browser closing event and save your data Ans: The onunload event gets fired when the browser is closed or refreshed(using F5 or the refresh button). So now It turns out that the data was getting saved unnecessarily on refreshing the page. For that I stumbled across a forum where I found the solution.(It works for IE only) Q.How to disable function key F5? Ans: document.attachEvent("onkeydown", my_onkeydown_handler); function my_onkeydown_handler() { switch (event.keyCode) { case 116 : // 'F5' event.retur...

Say Java

Search This Blog