Pregunta de entrevista de iCIMS

Onsite interview 3: Some Java and OOP questions., then a code review, cannot remember exactly, Just remember, you need to check null pointers, make unused object point to null in order to make it eligible for garbage collection, synchronization if the methods were used in a multi-thread system. Last question is given an axis and lots of points. You are given a point as the the centre of a circle, and given the radius of the circle, find out how many points in the circle.