The dequeue method will also use method incrementIndex to add one to frontIndex (with wrap-around) before returning the value that was at the front of the queue. The other queue methods (empty and size) are the same as those methods for the Stack class -- they just use the value of the numItems field.
In other words, drinking alcohol is not entirely positive. Excessive drinking can cause increased risk of stroke, arrhythmia (irregular heartbeat), and heart muscle disease. Excessive calories that you can get from alcohol can raise your triglyceride (another kind of bad cholesterol). And the increased triglyceride can be potential to affect your LDL to rise.
Drinking alcohol has a complex effect on your circulation. In moderate amounts, alcohol can cause blood vessel dilation which actually improves circulation. This is why people report feeling warmer while they are drinking. Excess drinking can cause an increase in your blood pressure, but is not specifically associated with poor circulation.