Question

Accessing to parent class instance from subclass

Asked by: oraelbis

There is example:
public class A
{
  class B extends Object
  {

    public void method1()
    {
      /* Do something with parentObject like
      method2(parentObject);    
      */
    }

    private A parentObject;
    B(A a)
    {
      parentObject = a;
    }
  }
 
  public A()
  {
    B b;
    b = new B(this);
  }
}

Is there where more simple way to do this? Some thing like:
public class A
{
  class B extends Object
  {
    public void method1()
    {
      /* Do something with parentObject like
      method2(???);    
      ??? - parent claass
      */
    }
    B(){}
  }
 
  public A()
  {
    B b;
    b = new B();
  }
}

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Asked On
2002-09-18 at 06:38:36ID20360462
Topic

Java Programming Language

Participating Experts
3
Points
100
Comments
7

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Answers

 

by: Venci75Posted on 2002-09-18 at 06:49:17ID: 7288236

yes - you can access the methods and members of the parent object (A) directly from B

 

by: oraelbisPosted on 2002-09-18 at 07:03:04ID: 7288282

How.
When I use "this", I get B class methods.
When "super" - B superclass methods. But I need A.
For example:

public class A
{
 class B extends Object
 {
   public A getParent()
   {
     return (A); //Compiler error there "variable A not found in B"
   }
   B(){}
 }
 
 public A()
 {
   B b;
   b = new B();
 }
}

 

by: Venci75Posted on 2002-09-18 at 07:16:30ID: 7288320

try this:

public class A
{
int i;
class B extends Object
{
  public A getParent()
  {
    return (A); //Compiler error there "variable A not found in B"
  }
  B(){ i=2; }
}

public A()
{
  i = 1;
  System.out.println("i=" + i);
  B b;
  b = new B();
  System.out.println("i=" + i);
}
}

 

by: pellepPosted on 2002-09-18 at 13:17:51ID: 7289550

how about

class A {
}

class B extends A {
}

or is there a compelling reason for using inner classes?

 

by: objectsPosted on 2002-09-18 at 16:43:58ID: 7290011

public class A
{
class B extends Object
{
  public A getParent()
  {
    return A.this; // <- try this
  }
  B(){}
}

public A()
{
  B b;
  b = new B();
}
}

 

by: oraelbisPosted on 2002-09-19 at 02:17:50ID: 7290756

Thank you. :-)

 

by: objectsPosted on 2002-09-19 at 02:54:14ID: 7290812

No worries :-)

http://www.objects.com.au/staff/mick
Brainbench MVP for Java 1
http://www.brainbench.com

20120131-EE-VQP-002

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