Java static is a keyword used with instance variables and methods. Generally to call instance variables (the global variables of C-lang are known as instance variables in Java) and methods, we require an object. But to call static variables and methods we do not require an object. Infact, Java static keyword is known as access modifier. An access modifier is the one which modifies the access. Here, the modification is you are allowed to call without object.
A static variable or method can be called in three ways from main() method.
1. Can be called without object
2. Can be called with an object
3. Can be called with a class name
Following example gives the usage of Java static access modifier in the above three ways.
Note: By the time you come to Java static level, I expect you know know the basic Java, writing code, compilation and execution.
public class Demo
static int price = 100; // static variable
public static void display() // static method
public static void main(String args)
Demo d1 = new Demo();
System.out.println(price); // call the variable without object
System.out.println(d1.price); // call the variable with object
System.out.println(Demo.price); // call the variable with class name
display();; // call the method without object
d1.display(); // call the method with object
Demo.display(); // call the method with class name
In the above code, both price variable and display() method are declared static. They are called in three different ways.
Refer for more and clear understanding of the strength of static: Java static Variable Method