You can use the preprocessor directive #define, or you can describe a variable in the body of main(). With the preprocessor directive you can make the variable accessible even out of your current project.
A global variable is a place of data storage which multiple modules of application (sometimes all modules) can access to read and modify the variable's content. A macro is something altogether different. A macro is a set of instructions, typically used to save keystrokes when coding, and to maintain code readability. While macros can reference, declare or use variables (including global variables), macros and variables are quite different and cannot be compared.
Global variables are globally accessible. Java does not support globally accessible variables due to following reasons:The global variables breaks the referential transparencyGlobal variables creates collisions in namespac
No, threads do not share global variables by default. Each thread has its own copy of global variables, which means changes made to global variables in one thread do not affect the values in other threads.
Another name of global variable is "EXTERNAL VARIABLES".
Variables that are declared globally outside every program are called global variables.
Storing global data.
Global variables can be seen in all blocks of your program, when local variables are visible only within the block where it's declared.
They is not.
No.
The only disadvantage of a global variable is that you cannot directly encapsulate them. Other than that, there is no real disadvantage of global variables.
There's no global variables in Java.
Only global/static variables are, local variables aren't.