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So, the question must not be very confusing. i have a class A that
extends Thread. Then, i have class B that extends A. The first problem
was that i didn't compile printing out the error that "class A doesn't
have A() constructor" To tell the truth it really hadn't have such. When
i added an empty one, this error disappeared. So, it is the question of
curiosity: why does class A need that constructor without parameters to
be extended?
Another one is a real question. The deal is that constructor of class B
has smth like this in its body:

public class B extends A{

  public B(Smth a1, Smth a2, Smth a3, Smth, a4){
    try{
    
    ....
    }
    catch{
    ....
    }
  }

But i need to call the constructor of class A here. If i wouldn't had
had try catch blok, then evrth would have been simple. I just should
call super(a1, a3) 4 instance and that's all. But since the first string
is "try{" then i still have another possibility of calling it via
super.A(a1, a3) But as it appeared it's not correct, since the compiler
translate this expression like calling a function A, not the
constructor.
So, the question is can i do this (call A constructor from try catch
blok) or not? I don't mean the way when u replace try catch blok outside
B constructor ( try{ new B(...)}catch{} )


If u know that it's possible than explain it to me. If u know that it's
not possible, write me back anyway 4 me to know. Thanks in advance. I do
appreciate the time u spent reading this long message, and the time u'll
possibly spend answering me.

                                          Vladimir

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note:Java programmer. Open for project development offers. See my home page at: http://www.geocities.com/SiliconValley/Heights/9815/
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