1. incompatible types: OptionalInt cannot be converted to Integer
https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html
Integer (Java Platform SE 7 )
Returns the value obtained by rotating the two's complement binary representation of the specified int value right by the specified number of bits. (Bits shifted out of the right hand, or low-order, side reenter on the left, or high-order.) Note that right
docs.oracle.com
https://docs.oracle.com/javase/8/docs/api/java/util/OptionalInt.html
OptionalInt (Java Platform SE 8 )
Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that
docs.oracle.com
https://stackoverflow.com/questions/33190768/optionalint-vs-optionalinteger
OptionalInt vs Optional<Integer>
When scrolling through the documentation for the java.util package, I was surpised to find that Optional<T> and OptionalInt have no relationship to each other. This seems very hard to belive,...
stackoverflow.com
2. 0과 null의 차이
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