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Possible Duplicate:
What is the Java ?: operator called and what does it do?
In some code a ? is used to perform a mathematical equation.
What is it and how do you use it? Is it possible to provide an example and the reason for the final answer of an equation?
int count = getChildCount();
int top = count > 0 ? getChildAt(0).getTop() : 0;
Basically is the ternary operator:
if isHappy, then “I’m Happy!”. “I’m Sad!” otherwise.