Linux: what is a most convenient way to see the content of .jar file

What is a most convenient way to see the content of .jar file w/o using unzip/untar commands? What I'd like to do - is to browsing inside using cd command like it is the usual folder, seeing content, size of classes - 'ls -la'.

MC allowed to do so on the fly. Is there are any ease-in-use alternative?

Use the jar tool that comes with the Java SDK for listing contents of a jar file. As described in http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jar.html

$ jar tvf jarfile.jar

Use vim to view and edit the contents of a jar file without extracting:

Open the jar in vim like this:

vim rabbitmq-client.jar

You are presented with a list of files:

1 " zip.vim version v22
2 " Browsing zipfile /var/www/sandbox/eric/rabbitmq-client.jar
3 " Select a file with cursor and press ENTER
4
5 META-INF/
6 META-INF/MANIFEST.MF
7 com/
8 com/rabbitmq/
9 com/rabbitmq/client/
10 com/rabbitmq/client/impl/
11 com/rabbitmq/client/impl/recovery/
12 com/rabbitmq/tools/
13 com/rabbitmq/tools/json/
14 com/rabbitmq/tools/jsonrpc/
15 com/rabbitmq/utility/

Put the cursor over the META-INF/MANIFEST.MF and press Enter. You see this:

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.2
Created-By: 1.6.0_31-b31 (Sun Microsystems Inc.)
Export-Package: com.rabbitmq.client;version="3.3.5";uses:="com.rabbitm
 q.client.impl,com.rabbitmq.utility,javax.net,javax.net.ssl,javax.secu
 rity.auth.callback,javax.security.sasl",com.rabbitmq.client.impl;vers
 ion="3.3.5";uses:="com.rabbitmq.client,com.rabbitmq.utility,javax.net
 ",com.rabbitmq.client.impl.recovery;version="3.3.5";uses:="com.rabbit
 mq.client,com.rabbitmq.client.impl",com.rabbitmq.tools;version="3.3.5
 ";uses:="com.rabbitmq.utility",com.rabbitmq.tools.json;version="3.3.5
 ",com.rabbitmq.tools.jsonrpc;version="3.3.5";uses:="com.rabbitmq.clie
 nt",com.rabbitmq.utility;version="3.3.5"
Bundle-Vendor: SpringSource
Bundle-Version: 3.3.5
Tool: Bundlor 1.0.0.RELEASE
Bundle-Name: RabbitMQ Java AMQP client library
Bundle-ManifestVersion: 2
Bundle-SymbolicName: com.rabbitmq.client
Import-Package: javax.net;version="0",javax.net.ssl;version="0",javax.
 security.auth.callback;version="0",javax.security.sasl;version="0"

Name: rabbitmq-client
Specification-Title: AMQP
Specification-Version: 0.9.1
Specification-Vendor: AMQP Working Group (www.amqp.org)
Implementation-Title: RabbitMQ
Implementation-Version: 3.3.5
Implementation-Vendor: Rabbit Technologies Ltd. (www.rabbitmq.com)

Change a few lines using normal vim editing commands.

press 'i' to enter insert mode
edit your lines
press :wq<enter> to write and quit

You are taken back to a list of files in the jar, quit out.

:q <enter>

Check to see if it the changes are permanent:

Follow the above steps again to inspect the file again, 
the change should still be there.