static main java

public : “public” is an access specifier which can be used outside the class. When main method is declared public it means it can be used outside class. static : To call a method we require object. Sometimes it may be required to call a method without the help of object. Then we declare that method as static. JVM calls the main() method without creating object by declaring keyword static. If we make the main method non-static, JVM will have to create its object first and then call main() method which will lead to the extra memory allocation. void : void return type is used when a method does’nt return any value. main() method doesn’t return any value, so main() is declared as void.

//Java Program to get the cube of a given number using the static method using static before a method or variable we can access it by not creating a instance of it.in the program we directly used student.cube(5) class Calculate{ static int cube(int x){ return x*x*x; } public static void main(String args[]){ int result=Calculate.cube(5); System.out.println(result); } }

static in java

static keyword: belongs to the class, also can be called through the class
static variable: declared outside any block with static keyword
static: runs first, only runs one time
static member:
1. static variables
2. static methods
3. static initializer block
4. static inner class(nested class)
static methods: methods that we can call it through the class name. 
  belongs to the class
Ex: Webdriver driver = WebdriverFactory.getDriver();
 *********  Static methods only accepts class member(static) ************
*********   None static can ONLY be called through the object ***********

Static only accept static. Anything not static you cannot call directly.
You can call Instance variable in Constructor.
You cannot call instance variable in static you have to create object first.
You can call non static (instance variable) in the instance block.
You can call static in the instance block
Static variable da last initialization will be final value.

Posted by: Guest on May-28-2021

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