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What are things need to keep in mind when using static variable?
use static variables when : The value of the variable is independent of the objects (not unique for each object). E.g. number of students. Static variable: When you need something that will be used through out the application and every instance need to know the variable.
Can we access static variable without using object?
It can be accessed before any objects of its class are created and without reference to any object. We can declare methods, variables, and blocks to be static. main( ) method is declared as static because it must be called before any objects exist.
Can static variables be accessed by objects?
Static Methods can access class variables(static variables) without using object(instance) of the class, however non-static methods and non-static variables can only be accessed using objects.
How to uncomment a static variable in Java?
Step 4) It is possible to access a static variable from outside the class using the syntax ClassName.Variable_Name. Uncomment line # 7 & 8 . Save , Compile & Run . Observe the output. Step 5) Uncomment line 25,26 & 27 .
How are static variables used in a class?
To manipulate and use the values of static variables we can also define a function as static. The keyword “static” means that only one instance of a given variable exists for a class. Static variables are used to define constants because their values can be retrieved by invoking the class without creating an instance of it.
When is a static variable destroyed in a program?
1) A static int variable remains in memory while the program is running. A normal or auto variable is destroyed when a function call where the variable was declared is over. For example, we can use static int to count a number of times a function is called, but an auto variable can’t be used for this purpose.
Can a static variable be declared outside a member function?
Static variables can be initialized outside the member function or class definition. The following code is an example of a static variable, which shows the declaration and initialization of a static variable. Here we have not used an instance of the class for the static method display ().