Re: Type casting

From:
Lew <lew@nowhere.com>
Newsgroups:
comp.lang.java.programmer
Date:
Sun, 17 Dec 2006 00:21:38 -0500
Message-ID:
<opednR2yWrB-ThnYnZ2dnUVZ_tyinZ2d@comcast.com>

programming wrote:

public class Thingy
{
    public TextField value;

Most times one should keep member variables private and use accessor methods
to get at them.

     public Object clone()
Your intent is to override Object.clone(), correct?

     {
        Thingy n;

        n=new Thingy();
        n.value=this.value;

This causes the clone to share a reference to the same TextField as its
progenitor's.

         return n;
    }
}

------------------------------------------------------------------------------------------------------------------------------------------------
public class Question
{
    Thingy t1,t2;

    public static void main(String args[])
    {

    t1= new Thingy();

    t1.value.setText("Cufflinks for Aus");

    t2=(Thingy) t1.clone();
    t2.value.setText("Bah Humbug!");

This replaces the text attribute in the value field that is pointed to by both
t1 and t2.

     }

}


Not only is the TextField 'value' shared, but it has public access, meaning
that it's subject to change any ol' which where.

- Lew

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