Re: Question about calling a method

From:
Mark Space <markspace@sbc.global.net>
Newsgroups:
comp.lang.java.help
Date:
Wed, 13 May 2009 18:51:49 -0700
Message-ID:
<5PKOl.26512$c45.21795@nlpi065.nbdc.sbc.com>
Charles Hottel wrote:

logo = getImage(getDocumentBase(), "logo.gif");

If these were a static calls I would expect to see something of the form
Classname.methodname().
If these were object methods I would expect something like
objectname.methodname().

But I do not see either an object or a classname. From the documentation I
do not think these are static methods, so my question is what is the object
associated with these calls? Thanks.


As Joshua said, there's an implicit "this" in the method call. This
works for field names as well as method names.

class Demo {
   private String something = "test";

   private void testSomething() {
     System.out.println( something );
   }

   public doIt() {
     testSomething();
   }
}

Prints "test" when doIt() is invoked. testSomething() is assumed to
mean this.testSomething() and something is assumed to mean this.something.

This works with inheritance, so I think that's where you're getting
confused. You're actually calling a parent's method, on your own object.

class Demo2 {
   public synchronized void waitForIt() {
     wait();
   }
}

Invokes "this.wait()" on the Demo2 object. wait() is from Object, which
is inherited by all classes.

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