liv(int) in Liv cannot be applied to () - Java

Zacker · *Last edited by Zacker; 04-06-2004 at 22:38..*

Compile error:

Code:

liv(int) in Liv cannot be applied to ()
     stats_sum = styrke + intelligens + liv.liv()/10;

With a ^ below the dot.

I initialize the method/function here:

Code:

//Opret et objekt af klassen Liv  
Liv liv = new Liv();

The method/function:

Code:

//Justerer eller returnerer spillerens liv
	public int liv(int a)
	{
	  if(a!=0)
	  {
	   //Giver spilleren a mere i liv, hvis a ikke er 0
	   liv = liv + a;
      System.out.println("Du har nu " + liv + " i liv");
	  }
	  else
	  {
	     //Returnerer værdien af liv til den kaldende funktion
	     return liv;
	  }

   }

I hope it obvious that I just want the value of liv

Edit:
It works if I call it with the parameter 0. Then I thought it would help initializing the variable in the method, like this:
public int liv(int a=0)
That just resulted in a bunch of compile errors.

stefanhendriks · *Last edited by stefanhendriks; 04-06-2004 at 22:54..*

its logical that you have to pass something to liv(), since you ask for ONE parameter. This would not compile in C either

i think this:

Code:

stats_sum = styrke + intelligens + liv.liv()/10;

should be:

Code:

stats_sum = styrke + intelligens + liv.liv/10;

since you want to know the liv as variable, not the function. I dont see any input so i guess you want the liv number... If you want to use the function you should probably do:

Code:

stats_sum = styrke + intelligens + liv.liv(0)/10;

which does the same as the previous line i gave, since it just returns 'liv' as variable.

KickBot · *Last edited by KickBot; 05-06-2004 at 12:50..*

stefan has the answer.

As a more general remark, you shouldn't give the same name to a method and a member variable. This will only cause you more problems like this one in the future. Java coders prefer stuff like getXXX, setXXX, addXXX etc...

Also Java and C++ look similar in some places but there are differences, like no default parameters.
In C++ you would write:

Code:

void foo( int i = 0 ) { ... }

In Java you can't, that's why the compiler refuse to compile your code, and the Java way is to do:

Code:

void foo() { foo(0); }
void foo( int i ) { ... }

Well. At least for j2 1.4, I've heard 1.5 has syntax changes and new stuff.

Hope this heps.

Zacker · **Re: liv(int) in Liv cannot be applied to () - Java -** 05-06-2004

Quote:

Java coders prefer stuff like getXXX, setXXX, addXXX etc...

That was also how I did it first time. Then I thought it would be smarter just to combine the functions.