Java null String equals result

Question

Please help me how does the string.equals in java work with null value? Is there some problem with exceptions? Three cases:

boolean result1,result2, result3;         


        

Answer 1

Our most common use-case of this type of thing is when we have a database field that contains "Y" or "N" to represent a Boolean (it's an old system, don't ask).

Thus, we do this:

if ("Y".equals(stringObjectThatMayBeNull) ? result : otherResult);

Instead of this:

if (stringObjectThatMayBeNull.equals("Y") ? result : otherResult);

... which avoids a NullPointerException when executing the .equals method.