what is static variable

#include<iostream> void Increment() { int i = 0;//The life time of variable is limited to the function scope i++; std::cout << i << std::endl; };//This will increment i to one and when it will reach the end bracket the lifetime of var will get destroyed void IncrementStaticVar() { static int i = 0;//The life time of this var is = to program i++; std::cout << i << std::endl; }//This will var i increment i till the program ends and i will get destroyed when program ends int main() { Increment();//output 1 Increment();//output 1 Increment();//output 1 IncrementStaticVar();// output 2 IncrementStaticVar();// output 3 IncrementStaticVar();// output 4 IncrementStaticVar();// output 5 std::cin.get(); }

The static variable is used to refer to the common property of all objects (that is not unique for each object), e.g., The company name of employees, college name of students, etc. Static variable gets memory only once in the class area at the time of class loading. Using a static variable makes your program more memory efficient (it saves memory). Static variable belongs to the class rather than the object.

Static Variable

//Static variable
If you declare any variable as static, it is known as a static variable.

The static variable can be used to refer to the common property of all objects (which is not unique for each object), for example, the company name of employees, college name of students, etc.
The static variable gets memory only once in the class area at the time of class loading.
Advantages
It makes your program memory efficient (i.e., it saves memory). 
Example
//Java Program to demonstrate the use of static variable  
class Student{  
   int rollno;//instance variable  
   String name;  
   static String college ="ITS"; //static variable  
   //constructor  
   Student(int r, String n){  
   rollno = r;  
   name = n;  
   }  
   //method to display the values  
   void display (){System.out.println(rollno+" "+name+" "+college);}  
}  
//Test class to show the values of objects  
public class TestStaticVariable1{  
 public static void main(String args[]){  
 Student s1 = new Student(111,"Karan");  
 Student s2 = new Student(222,"Aryan");  
 //we can change the college of all objects by the single line of code  
 //Student.college="BBDIT";  
 s1.display();  
 s2.display();  
 }  
}

Posted by: Guest on August-31-2021

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