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Have a Class object, and a static method within that class. How do i call that method from another class?

Posted on 2006-11-02
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Last Modified: 2010-03-31
So I have a class, say myPackage.myClass, and within that class i have a static method.

Now - in another class, say myPackage.myOtherClass, i have a Class object that points to myClass. How do i call the static method of that class, within myOtherClass?
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Question by:dannertb
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9 Comments
 

Author Comment

by:dannertb
ID: 17864678
Later edit: the method is not static.
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LVL 24

Expert Comment

by:sciuriware
ID: 17864688
You can call a method:

by  class.method( );

or by

     object-reference.method( );

the first applies to static methods, the second to non-static methods,
although static methods are accessible that way.

All depends on the access: public-protected-package-private

;JOOP!
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Expert Comment

by:sciuriware
ID: 17864699
And please adjust your writing: a reference does not point to a class but to an object.
A class object? do you mean a static reference?

public class MyClass  // Starts with a capital letter!
{
public static aStaticMethod(){ <statements> }
.....
}

public class MyOtherClass   // Starts with a capital letter!
{
     public static MyClass ref = .....;

     public someMethod()
     {
           ref.aStaticMethod();  // There you go!
     }
 }

;JOOP!
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LVL 24

Expert Comment

by:sciuriware
ID: 17864704
  public someMethod()
     {
           ref.aStaticMethod();  // There you go!
     }

or:

   public someMethod()
     {
           MyClass.aStaticMethod();  // Ditto, NOT via a reference.
     }

;JOOP!
0
 
LVL 14

Accepted Solution

by:
hoomanv earned 500 total points
ID: 17864720
> i have a Class object that points to myClass. How do i call the static method of that class
Through reflection

Class c = MyClass.class;
Class[] parameterTypes = new Class[] {String.class, ...};
Method m = c.getMethod("method-name", parameterTypes);
Object result = m.invoke(null, arguments); // null since you are calling a static method
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Author Comment

by:dannertb
ID: 17864728
Bravo hoomanv. The only one who understood the real problem.
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Author Comment

by:dannertb
ID: 17864734
However the method is not static...
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LVL 14

Expert Comment

by:hoomanv
ID: 17864744
> However the method is not static...
So instead of null pass an instance reference to the invoke method.
You can construct an instance from Class object too
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Author Comment

by:dannertb
ID: 17864776
Yeah, with newInstance().

Thanks.
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