Think in Java

Chapter II
(almost) everything is an object
An identifier is actually a reference to an object
Basic types have wrapper classes
High Precision Digital Biginteger,bigdecimal
Scope overrides are not allowed
There are two types of elements in a class: field (data member), method (member function)
When a variable is used as a member of a class, Java gives it its default value. Local variables are not automatically initialized, and errors are returned at compile time.
Reverse Domain name as namespace
Import indicates that the compiler imported a package

Think in Java