How many classes are there in Java standard edition?

Question

I am curious how many classes are there in Java standard library. Perhaps someone knows an approximate number?

Answer 1

• Java 1.0.2 : 250 classes
• Java 1.1 : 500 classes
• Java 2 (version 1.2-1.4) : 2300 classes
• Java 5.0 (version 1.5) : 3500 classes

Source : Head First 2nd edition, Chapter 1, p. 4