Shell

New File.
Update

Check style.
Update Shell.java
Update

Check style.
Update Shell.java
Update Shell.java
Update Shell.java
Update Shell.java
Update Shell.java
Update Shell.java
Update Shell.java
Update Shell.java
Update Shell.java
Update Shell.java
Update Shell.java
Update Shell.java
Update Shell.java
Update Shell.java
Update Shell.java

Add "final".
Update Shell.java

Change work with Scanner.