Constructor inheritence

[jeff mutonho]

Consider the two classes:

public abstract class A {
private boolean booleanVal = false;

public A() {
super();
}

public A(boolean val) {
this();
booleanVal = val;
}
}

public class B extends A {
public B() throws Exception{
super(true);//set booleanVal in superclass to true
init();
}
}

Calling super(true) in B should set booleanVal to true.When I run this , and booleanVal is never set yo "true".Why is this?

[Stuart Ash]

How are you printing it?

[jeff mutonho]

I try to use it in test , later in B as shown below :

if(booleanVal){
System.out.println("booleanVal value set to true");
}else{
System.out.println("booleanVal still false");
}

and "booleanVal still false" is printed.

[k Oyedeji]

What does the init() method do?

[Reghu Ram Thanumalayan]

Originally posted by jeff mutonho:
I try to use it in test , later in B as shown below :

if(booleanVal){
System.out.println("booleanVal value set to true");
}else{
System.out.println("booleanVal still false");
}

and "booleanVal still false" is printed.

if booleanVal is private in A, how can you access it in B ?

Most probably, I think you have defined another instance variable in B called 'booleanVal' which is why it is being printed as false.
[ November 28, 2005: Message edited by: Reghu Ram T ]

[Ramender Mall]

Buddy,
You posted it in both the forums(intemediate and beginner)..

Whatever..

I tried your program( in simplest of the forms)and it ran fine...

  
abstract class aClass
{
    private boolean b = false;
 
    aClass()
    {
        super();
    }
 
    aClass(boolean bool)
    {
        this();
        b = bool;
    }
 
    public boolean retBool()
    {
        return b;
    }
}
 

 
public class showFlaw extends aClass
{
    public showFlaw()
    {
        super(true);
    }
    
    public static void main(String[] a)
    {
        showFlaw SF = new showFlaw();
        System.out.println("Boolean val: "+SF.retBool());
    }
}
 

 

It ran fine....See if there is any big difference between both the programs...

In my little program depending on the boolean value passed to super,

public showFlaw()
{
super(true);
}

, the println was responding accordingly...
And after seeing the other part of your code it seems to be the same issue as pointed out by Raghu Ram..

Ramy..
[ November 28, 2005: Message edited by: Ramender Mall ]