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Given the code fragment:

Boolean b1 = true;

Boolean b2 = false;

int i = 0;

while (foo) { }

Which one is valid as a replacement for foo?

A. b1.compareTo(b2)

B. i = 1

C. i == 2? -1 : 0

D. "foo".equals("bar")

Answer: D

Explanation:

Equals works fine on strings equals produces a Boolean value.

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