Contains only your code. If your code relies on external libraries (like Gson or Spring), the JAR will crash if those libraries are not present on the target machine's classpath.
: If the archive is executable, you can run it using the command java -jar myapp.jar . java archive
A standard JAR is just a library (a collection of code). To make it an application you can double-click or run from the command line, you must specify the (the class with the public static void main method). Contains only your code
The most basic way is using the jar tool included in the Java Development Kit (JDK). This requires you to have compiled your .java files into .class files first. A standard JAR is just a library (a collection of code)
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While JAR files remain the backbone of Java packaging, the platform has evolved significantly: How to create a Java ARchive (JAR) file
Because they are compressed, you cannot easily view or edit source files inside them without specialized tools like JD-GUI or a standard unzip utility.
