Java and C different points

1. Java has no preprocessing directives. (such as the #define in C, #include, #ifdef等). The constant definition in C is replaced with static final in Java.

2. There are no global variables in C in Java.

3. The size of the main type in Java is OK, whereas the size of the main type in C is related to the platform.

4. There is no pointer in Java, it uses a similar handle to replace the pointer, but Java does not allow the handle to add and subtract, do not take the address operator and so on.

5. Java has a garbage collection mechanism and does not need to free up its own space.

6. Java does not have a goto statement. Java adds exception handling and label break and continue statements based on the control statements provided by C. These can replace the role of Goto.

7. c requires that the definition of all local variables used in a method or block be defined at the very beginning of the method or block, and Java allows these definitions to appear anywhere in the method or block.

8. Java does not require that the function be defined before calling a function, which can be defined after the call point. and C has this requirement.

9. Java does not support the strut and union types in C. Java support method overload.

10. Java does not support the enum keyword in C.

11. Java does not support the ability to bitfields in C.

12. Java does not support typedef for C.

13. Java does not support method pointers for C.

Java does not support variable parameter tables for C.