Use of static keyword in java

                          static keyword in java

Note that:

   (1) Static members are the members that are defined as static by using ‘static’ keyword.

   (2) Within a class static members can be accessed by other static members only. 

    (3) In another class , the static member(may be a variable or a method) of a given class can be accessed by using the classname and dot operator. The commonly used examples are Math class static methods sqrt() , pow() etc.

   Consider the program shown below.

 

        In the above program we directly use the class name Math with dot operator to access its static methods. No object of class Math is created because the methods toDegree() and sqrt() are defined as static which is shown in the Math class definition given below.

    You can find the Math.java file here.