Static Keyword

Static keyword can be applied on

1.Method

2.Variable

3.Class nested within another Class

4.Initialization Block

Static keyword can not be applied to

1.Class (Not Nested)

2.Constructor

3.Interface

4.Method Local Inner Class(Difference then nested class)

5.Inner Class methods

6.Instance Variables

7.Local Variables

Static method and variable belong to a class.

To Invoke

Using below example we will learn to access Static method and Static Variable.

public class JavaStaticExample {

static int i = 10;

static void method() {
System.out.println("Inside Static method");
}

public static void main(String[] args) {

// Accessing Static method
JavaStaticExample.method();

// Accessing Static Variable
System.out.println(JavaStaticExample.i);

/*
* No Instance is required to access Static Variable or Method as we
* have seen above. Still we can access the same static variable and
* static method using Instace references as below.
*/
JavaStaticExample obj1 = new JavaStaticExample();
JavaStaticExample obj2 = new JavaStaticExample();

/*
* Accessing static variable in Non Static way. Compiler will warn you
* with below warning.
*
* The static field JavaStaticExample.i should be accessed in a static
* way.
*/
System.out.println(obj1.i);
// Accessing satic method using reference.
// Warning by compiler
// "The static method method() from the type JavaStaticExample should be accessed in a static way"
obj1.method();
}
}