Java do while loop making string testing act differently

Question

I am very confused at the behavior of using the || operator on the .equals function. Is there a reason I can not use it on strings or something?

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Answer 1

|| means OR.

A || B is true if A is true or B is true.

In your second while loop: !"Y".equals(input) is false because Y is equal to your input. However !"N".equals(input) is true because N is not equal to your input. Hense the whole condition is true, it goes into while loop again.