Static Keyword

• The static member is associated with a class rather than an instance. 
• It can be a class variable, method, or block, as well as a nested class.

Static with variable :

• A variable declared as static is known as a static variable.
• It has a common property among all other members of the class.
• It has a single copy of the value.
• It makes the program efficient in terms of memory.

Syntax:

static  data_type  variable_name = value ;

Example:

package quipohouse;
public class StaticVariable {
	static int a = 10;                  // Static Variable

	public int getStaticVarible() {
		return StaticVariable.a;        // Calling it by class name 
	}

	public static void main(String[] args) {
		StaticVariable s = new StaticVariable();
		System.out.println(s.getStaticVarible());
		System.out.println(StaticVariable.a);
	}
}

Output:

10
10

Static with method :

• A method declared as static is known as the static method.
• It is a member of a class, rather than its object.
• It can be called by class name.
• It can be called without creating an object inside a static block.
• A static member cannot call inside the non-static block without creating its object. 

Syntax:

static  data_type  method_name() 
{
   // body
} 

Example:

package quipohouse;
public class StaticMethod {

	public static void getStaticMethod() {          // Static Method
		System.out.println("Inside Static Method");
	}

	public static void main(String[] args) {
		StaticMethod.getStaticMethod();       // Calling by its Class name
		getStaticMethod();                    // Calling directly
	}
}

Output:

Inside Static Method
Inside Static Method

Static  block :

• The static data member can be initialized if the block is marked static.
• It will be executed before the main method when the class is loaded.
• it is executed only once.

Syntax:

static {
  // body
} 

Example:

package quipohouse;
public class StaticVariable {
	public static void getStaticVariable() {
		System.out.println("Inside Static Method");
	}
             // Static Block
	static { 
		System.out.println("Executed before Main Method");
	}

	public static void main(String[] args) {
		getStaticVariable();     // static method can directly called inside static block

	}
}

Output:

Executed before Main Method
Inside Static Method