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Dumb question about threads #2

Max Bazhenov
Greenhorn

Joined: Oct 30, 2004
Posts: 18
Given the following code, which statements are true?

A. The code will fail to compile.
B. Separate threads can execute the up() method concurrently.
C. Separate threads can execute the down() method concurrently.
D. Separate threads can execute both the up() and down() method concurrently.
E. The assertion in the jump() method will not fail under any circumstances.

ANSWER: C, D
Why D is correct ?
And why E is incorrect ?

(code tags added)
[ November 12, 2004: Message edited by: Barry Gaunt ]
Barry Gaunt
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Joined: Aug 03, 2002
Posts: 7729
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subject: Dumb question about threads #2