What is static in Java

Here is the key point on static

• static is a keyword in Java
• static variable also know as class variable.
• static variable are belong to class instead object.

let take look on code

  public class Employee{

      static int noOfEmployee;

  }

In above "noOfEmployee" are the static variable or class variable.Class contain only one copy of this attribute even if you create thousand object.

• static method only access static attribute instead instance variable.
• We can access static variable by class name rather than object just like Math.PI
• We cannot refer static variable to this keyword

Let's take another look of code

   public class Employee{

       private static int noOfEmployee;

       public int getNoOfEmployee(){

             return noOfEmployee();

       }

   }

//////////////////////////////////////////////////////////

Another most usable code  and static example is

  public class Employee{

     private static int noOfEmployee; 

     public static void main(){

           Thread.sleep(1000);

           System.out.println(noOfEmployee);

     }

  }

In above sleep is a static method of Thread class and see static method accept only static variable.

Whether instance method can contain static method.

Here is difference between the instance and class method by code

class Difference {
 
  public static void main(String[] args) {
    display();  //calling without object
    Difference t = new Difference();
    t.show();  //calling using object
  }
 
  static void display() {
    System.out.println("Programming is amazing.");
  }
 
  void show(){
    System.out.println("Java is awesome.");
  }
}