How do I create a jar file via the command line?

Question

Lets say I have these .java files:

MainClass.java
2ndClass.java
BarClass.java
FooClass.java

Then I turn them into .class files:

MainClass.class
2ndClass.class
BarClass.class
FooClass.class

How would I make it a jar file, and have MainClass.class be the first to be loaded?

Answer

Observing what Elliott said about class files, you can create (in recent versions of jar) the manifest implicitly with

jar cvfe m.jar MainClass *.class

That assumes that MainClass is in the default package (‘no package’) (not good practice). That will then run with

java -jar m.jar

Accepted Answer

Observing what Elliott said about class files, you can create (in recent versions of jar) the manifest implicitly withjar cvfe m.jar MainClass *.classThat assumes that MainClass is in the default package (&#8216;no package&#8217;) (not good practice). That will then run withjava -jar m.jar

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Answer