What is the difference between static and non static class members in java?

Answer 1

Static data members are different from automatic ones in the way that their lifetime is equals to the lifetime of your program. Even if you have declared static members inside of function (class) other than main();

Answer 2

A static member of a class is a member that is common (static) amongst all instances of the class. You might, for example, have a static member that counts the number of instances of the class. It would be incremented by the constructor and decremented by the destructor. It would be initizialized by code or convention outside the class interface.

Static members can be used this way to gather statitistics about the class as a whole or, alternatively, they can be used in class specific ways, such as in a class allocator that is optimized for the class.

Answer 3

STATIC DATA MEMBER

A data member of a class can be qualified as static. The properties of a static member variable are similar to that of a static variable. A static member variable has certain special characeristics.

1) It is initialized to 0(zero) when the first object of this class is created. No other initialization is permitted.

2) Only one copy of that member is created for the entire class and is shared by all the objects of that class, No matter how many objects are created.

3) It is visible only within the class but its lifetime is in the entire program.

The type and scope of each static member variable must be defined outside the class definition.This is necessary because the ststic data member are stored separately rather than as a part of an object. Since they are associated with the class itself rather than with any object. They are also known as class variable.

DATA MEMBER

Data memeber is the simple variable of a class which is initialized by member function of same class. By default data member is private and external functions can not access it.

Answer 4

A non static class member is an ordinary class member that is part of a class instance.

A static class member is shared by all instances of the class, i.e. there is only one copy, its lifespan starts from the first instance creation until the end of the program execution, and it can only be accessed by static class methods. One common use of static class members is to count the number of instances of a class there are, another might be to manage a private memory allocation strategy for the class.

Answer 5

A static member is local to the class rather than to an object of the class.

A static class is a class that cannot be instantiated. All members of a static class must be declared static and there can be no constructors, no copy or move operators and no destructor.

There is no such thing as a static constructor per se. However, you can define a static method that constructs and returns an object of the class. Like so:

struct A {

static A* construct () { return new A; }

};

int main() {

A* x = A::construct(); // invoke static constructor

// ...

delete x;

x = nullptr;

}

Clearly, a "static constructor" serves no practical purpose and would only lead to confusion.

Answer 6

Static contents belong to the whole class and not for the instances. Static members can access without instantiating. Members that are not static can be considered as dynamic members.