Java Static

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In Java language, the static keyword is mainly used for memory management. The static variable is shared by all the objects of that class. It is visible only within the class, but its lifetime is the entire program.

The static keyword can be used:

  • Static Variable
  • Static Method
  • Static Block.

Static Variable

To declare a variable as static is called as static variable.

Syntax:

static data_type variable_name;

Example:

public class Staticvariable
{  
	static int a=5;
	public static void main(String args[])
    {  
        System.out.println("Area of the square: "+ a*a);
	}   
}
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Static Method

Method of a class can also be declared as static. But the static method can access only static data member.

Syntax:

 static data_type method_name()
{
	...
}

Example:

public class Staticmethod
{  
	static int a=6;
	static void square() //Static method
    {
    	a=5;
    }
	public static void main(String args[])
    {  
	    Staticmethod.square();//calling square method  
        System.out.println("Area of the square: "+(a*a));
	}   
}
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Static Block

Static block always executed before the main method.

Syntax:

static
{
	....
}

Example:

public class Staticblock
{  
	static  //Static block
    {
    	System.out.println("Welcome");
    }
	public static void main(String args[])
    {  	     
        System.out.println("ProgramTpoint.com");
	}   
}
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