Fix broken compilation

visitUnknown method introduced

Visitor pattern with abstract class is relatively good

Example with non-extensible visitor

Changed to match the example in the book

Full coverage is not enough

Adding example, however only a sketch, of possible runtime check between alternative versions

Merge: Geertjan's changs up to 2000

up to line 2000

Checking that all examples pair the opening and closing brackets

Adding example with factory method for unsynchronized StringBuffer

Yet another use of Arithmetica

Another use for Arithmetica

Using Arithmetica for yet another example

Alternative behaviour with constructor described on Arithmetica example

Improved to look better in the book code sample

Shortening too long line

Design part is cleared from the non-colorized code snippets

Special project for inidividual samples, used to show code that can be called only from test

Example showing that factory methods have greater flexibility when typing with generics

Build needs to succeed

Line was too long

All TBDs from theory section are resolved

Example of append(StringBuffer)

Another uncompilable example, now it shows problems with double return type

Wild import

Sample code to work with filesystem layers

Beautifies keywords, comments and method names.

Truncating to 75 characters

Truncating all examples to 80 characters per line