Java Interview Cookbook —————— Java Basics Section (iii)

21, when writing the Clone () method, usually have a line of code, what is it?

22. What are the aspects of object-oriented features?

> 23, what is the difference between abstract class and interface?

24, the abstract method can be static at the same time, whether it can be native at the same time, whether it can be synchronized at the same time?

25, what is an internal class? Static Nested class and Inner class are different.

26, Anonymous Inner Class (anonymous inner Class) can extends (inherit) other classes, whether you can implements (implement)  interface (interface)

27, Super.getclass () method call

     what is the output of the program below?

28. Is string the most basic data type?

Java Interview Cookbook —————— Java Basics Section (iii)