how to set default main class in java

Question

I have  2 classes within same package  Both classes have main  method in them  Now I want to build a jar file  I want to build 2 jar files which use different main functions as default main   eg   class A     public static void main String args              do something        class B     public static void main String args              do something         How do I do it in NetBeans IDE   I found the answer  U can do it easily in netbeans  1 right click on project  properties   run   select the class frm and drop down list  So simple in netbeans  Netbeans rocks

User · Answer

As a comment  I had to allow a customer to execute a class in a jar which meant that the manifest file couldn t be modified  they couldn t be expected to do that   Thanks to the post by Anthony and samy-delux s comment  this is what the customer can now run to access the main of the specific class   java -cp c  path to jar jarFile jar com utils classpath -e -v textString

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you can right click on the project select  set configuration  then  Customize   from there you can choose your main class

User · Answer

In the jar file you could just add this to your manifest mft  Main-Class   A   The jar file would then be executable and would call the correct main   On how to do this in Netbeans you can look at this  Producing executable jar in NetBeans

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If you re creating 2 executable JAR files  each will have it s own manifest file  and each manifest file will specify the class that contains the main   method you want to use to start execution   In each JAR file  the manifest will be a file with the following path   name inside the JAR -  META-INF MANIFEST MF  There are ways to specify alternatively named files as a JAR s manifest using the JAR command-line parameters   The specific class you want to use is specified using Main-Class  package classname inside the META-INF MANIFEST MF file   As for how to do this in Netbeans - not sure off the top of my head - I usually use IntelliJ and   or Eclipse and usually build the JAR through ANT or Maven anyway

User · Answer

If the two jars that you want to create are the mostly the same  and the only difference is the main class that should be started from each  you can put all of the classes in a third jar  Then create two jars with just a manifest in each  In the MANIFEST MF file  name the entry class using the Main-Class attribute   Additionally  specify the Class-Path attribute  The value of this should be the name of the jar file that contains all of the shared code  Then deploy all three jar files in the same directory  Of course  if you have third-party libraries  those can be listed in the Class-Path attribute too

User · Answer

You can set the Main-Class attribute in the jar file s manifest to point to which file you want to run automatically

User · Answer

In Netbeans 11 Gladle Project  follow these steps   In the tab files gt yourprojectname gt  double click in the file  build gladle  than set in line  mainClassName  yourpackagepath YourMainClass    Hope this helps

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Right-click the project node in the Projects window and choose Project Properties  then find run  there you can setup your main class     actually got it from netbeans default help

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Best way is to handle this in an Ant script  You can create 2 different tasks for the 2 jar files  Specify class A as the main class in the manifst file for the first jar  similarly specify class B as the main class in the manifest file for the second jar   you can easily run the Ant tasks from Netbeans

User · Answer

Assuming your my jar has a class1 and class2 with a main defined in each  you can just call java like this   java my jar class1  java my jar class2   If you need to specify other options to java just make sure they are before the my jar  java -classpath my jar class1

User · Answer

Press F11 to Build and the Run the program  Once you run the program  you will have a list of classes  Select your main class from the list and click ok to run

[java] how to set default main class in java?

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