公共或私有Java方法的效率

Question

在Java中，当公共或私有方法在同一类中调用时，它们的效率是否有所不同？

Answer 1

No. There is no difference at all if you use it in the same class and you see the only difference while accessing it outside the class. Again there is no performance difference. It is just matter of giving access to method.

Access level modifiers determine whether other classes can use a particular field or invoke a particular method.

They do not impact any performance (as pointed by Andy in comments, unless you use nested classes and even then that's almost negligible difference ).