Autoboxing/ Unboxing in Wk6 "Weekly Roster"

[NGXZS]

Hi all, would like to ask about autoboxing/ unboxing in Java.

The partial solution for Wk6 "Weekly Roster" has this line of code: Integer newValue = Integer.valueOf(roster.get(day).intValue() + 1);.

Would like to ask if we can just type: Integer newValue = roster.get(day) + 1; as Java does autoboxing/ unboxing for us (see https://www.geeksforgeeks.org/autoboxing-unboxing-java/).

Or is this a code standard thing?

Would appreciate any clarifications/ inputs, thank you!

[ZMinghuiZ]

Hi, I think this expression Integer newValue = roster.get(day) + 1; is ok. Since roster.get(day) would return a Integer instance and by adding 1, the integer instance is unboxed into int to perform the addition. When the addition result is assigned to newValue it is boxed into an Integer. These processes is done automatically by Java, which is equivalent to do Integer newValue = Integer.valueOf(roster.get(day).intValue() + 1); where u are boxing and unboxing manually.

[okkhoy]

You can use either of them; nothing to do with coding standards here :-)