How to Create an Executable JAR File for a Java Swing Application?

Creating Executable JAR Files for Java Swing Applications

Question:

For a Java Swing program with multiple source files, how can I create an executable JAR file to distribute and execute the program?

Answer:

To create an executable JAR file for a Java Swing program, follow these steps:

1. Compile the Source Files: Compile all the Java source files of your program.
2. Main Class Identification: Determine the main class that contains the main method. This class should extend javax.swing.JFrame or a similar Swing component.

3. Create a Manifest File (MANIFEST.MF): Create a text file named MANIFEST.MF with the following contents:

   Manifest-Version: 1.0
   Main-Class: <main class name></main>

   Replace

   with the fully qualified name of the main class.

4. Compile the Manifest File: Convert the MANIFEST.MF file into a binary manifest file using the jar command:

   jar cvfm manifest.mf -C . *.class

5. Create the JAR File: Package all compiled class files and the binary manifest file into a JAR file using the jar command:

   jar cfm jarexample.jar manifest.mf *.class

   Replace jarexample.jar with the desired name for your JAR file.

6. Make the JAR Executable: To make the JAR executable, modify its permissions using the chmod command on Linux/macOS or jarsigner on Windows:

   chmod +x jarexample.jar

   Or

   jarsigner -keystore keystore.jks -storepass password jarexample.jar <key alias></key>

Following these steps will create an executable JAR file that can be executed by double-clicking on it or running it from the command line using java -jar jarexample.jar.

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