What are the key differences between OO in Smalltalk and Java?

Question

What are the key differences between OO in Smalltalk and Java?

Please note that I am a Java programmer trying to expand his horizons by exploring Smalltalk. Currently I

Answer 1

In Smalltalk everything is the object while in Java things like small integers are still not the first class objects. Also, to continue with numbers, in Smalltalk due to its pure OO nature and strong reflective capabilities we never need to care about the number size, like if an integer is small or large and what happens when small integer overflows to large.