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Index › Programming Questions & Help › Syntax Questions › passing Array as Parameter
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passing Array as Parameter (Read 509 times)
alphachapmtl
passing Array as Parameter
Oct 23rd, 2006, 9:56am  
I have an object with a lot of parameters, which I would like to group for clarity.

I had
   w1 = new walker(12,13,14,23,24,25,34,35,36,14,35,26);
calling
   walker(int a1,a2,a3,b1,b2,b3,c1,c2,c3,d1,d2,d3){...}

Now I have
   int [] a = {12,13,14};
   int [] b = {23,24,25};
   int [] c = {34,35,36};
   int [] d = {14,35,26};
   w1 = new walker(a,b,c,d);
calling
   walker(int [] aa, int [] bb, int [] cc, int [] dd){...}

But I would prefer simply
   w1 = new walker({12,13,14},{23,24,25},{34,35,36},{14,35,26});

But this last form does not work.
Compiler says:  unexpected token:{

Is there another way ?

------------------------------------------------
The actual line in my RandonWalker program is
 wc1 = new Walker(500,200,300,1,3,3,3,FF,TT,FF,TT,TT,TT,TT,192,128,64,64,0,0,0,0,128,64,64,
128,128,32,128,0,0,0,0,0,0,0,0,0,FF,FF,FF,FF);
I often manually change these parameters, and it's easy to change the wrong one.
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JohnG
Re: passing Array as Parameter
Reply #1 - Oct 23rd, 2006, 11:04am  
You can use a syntax similar to:

Code:
w1 = new walker({12,13,14},{23,24,25},{34,35,36},{14,35,26});


But the proper syntax is (I think):
Code:
w1 = new walker(new int[]{12,13,14}, new int[]{23,24,25}, new int[]{34,35,36}, new int[]{14,35,26});
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alphachapmtl
Re: passing Array as Parameter
Reply #2 - Oct 23rd, 2006, 11:49am  
He, Thanks, I tried it and it work!

It is a bit cumbersome to write those "new int[]" and "new boolean[]", but that will do.

My object definition line now goes from:

 wc1 = new Walker(200,ww,hh,2,1,1,1,nrep,varep,TT,TT,TT,FF,FF,64,192,128,64,0,0,0,32,32,0,0
,0,0,32,0,0,0,0,32,0,16,16,16,0,TT,TT,TT,TT);

to (using Auto Format):

 wc1 = new Walker(200,ww,hh,2,1,1,1,nrep,varep,TT,TT,TT,FF,FF,new int[] {
   64,192,128,64  }
 ,new int[] {
   0,0,0,32  }
 ,new int[] {
   32,0,0,0  }
 ,new int[] {
   0,32,0,0  }
 ,new int[] {
   0,0,32,0  }
 ,new int[] {
   16,16,16,0  }
 ,new boolean[] {
   TT,TT,TT,TT  }
 );

Is it better now? I'm not sure.

By the way, I always define TT=true and FF=false.
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JohnG
Re: passing Array as Parameter
Reply #3 - Oct 23rd, 2006, 12:06pm  
To be honest, I think you might have more luck in adding clarity, if you don't pass every single parameter into the constructor. If there are groups, create a seperate method for setting those paramters, e.g.

Code:
class walker
{
  int .... // all your variables
  walker(){}
  void setFoo(int a, int b, int c, int d)
  {
    //apply these numbers.
  }
  void setBar(..)
  {
    //etc... 
  }
  // etc, etc, etc...
}
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alphachapmtl
Re: passing Array as Parameter
Reply #4 - Oct 23rd, 2006, 9:33pm  
It's a good idea.

This way, one thing I could do is set default values into the constructor,
and change using other methods only when needed.

So for example

w = new walker(aa,bb,x1,x2,x3,x4,y1,y2,y3,y4,colx1,colx2,coly1,coly2);

could become

w = new walker(aa,bb);
set_coord(x1,x2,x3,x4,y1,y2,y3,y4);
set_colors(c1,c2,c3,c4);
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