static imports

[Konda Golamaru]

Pls. clarify on below static imports.

import static java.lang.*;//generates the compilation error
cannot find symbol class lang

import static java.lang.System.out;//works fine

[Keith Lynn]

The static import feature can only be used to import the static members of a class. You cannot use it the way you use a normal import statement where you import all .class files in a package.

[ragavendran krishnamoothy]

can you explain the static import concepts with some examples ..........
stating the advantages & restrictions of the concepts....

[Apna Apana]

hi
can you please explain in detail about static imports and also how they are useful.




Cheers
Apna

[Keith Lynn]

Here is an example of using a static import.

import static java.lang.Math.pow;
 
class MyClass {
 
   public double e(int number) {
      return(pow(1+1.0/number,number));
   }
 
}

As you can see the advantage of using the static import is that we do not have to use the classname Math when calling the method pow.

We can call the method as if it were defined in the class.

[Apna Apana]

Thank You Keith

[Nik Arora]

import static java.lang.*;//generates the compilation error
cannot find symbol class lang

Hi Konda,
You cannot import all the members by saying "*" on the package.You have to explicitly import all the members.