What are the restriction on static functions in java?

Answer 1

Static Methods Can:

• Access only static variables
• Invoke other static methods only

Static Methods cannot:

• Access Instance variables
• Invoke instance or non-static methods

Answer 2

In C and C++, a static function is a function that is only visible from within the scope of the translation unit in which it is defined. While this is a useful method of encapsulating a function (essentially hiding it from other translation units), the compiler can also take advantage of the fact that it has all the information required to statically bind the function to its callers and, in some cases, inline expand those calls to improve efficiency. By contrast, non-static functions may be invoked from with several translation units, but the compiler cannot "see" the other translation units (each translation unit is compiled independently, even if two or more can be compiled concurrently) so it cannot see every call and therefore cannot bind those calls to the function (which may well be defined in yet another translation unit). Instead, whenever it encounters a call or a definition, the compiler adds a symbolic entry to the dynamic section of the object file so that the linker can locate both the function and all its callers and thus bind them at link-time.

Answer 3

Static keyword when used with a method, specifies that this method belongs to the class and not a particular instance of the class (a.k.a object of the class)

Ex:

public class StaticTest {

public static String getAuthorName() {

return "Anand";

}

}

Here getAuthorName is the static method and it can be accessed without instantiating an object of the class StaticTest. You can access this method as:

String authorName = StaticTest.getAuthorName();

The Restrictions are:

a. The static methods can access only other static methods

b. Static methods cannot access instance methods

c. Static methods cannot access instance variables

Answer 4

Some restrictions are:

• static methods can invoke/call other static methods only
• static methods can use only static variables