Summary of three basic interview questions

Catalog

Round 

 Java Heap memory   classification

Force conversion small calculation  

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Round 

Math.round(11.5)  How much  (). Math.round(-11.5)  How much  (  ).

12 -11

floor ： It means floor , Point down and round , Returns the largest integer not greater than it

ceil ： It means ceiling , Point up and round , Returns the smallest integer that is not less than it

round ： It means about