Re: what is the RIGHT THING to make a constructor of a subclass, using super()

Mark_Galeck <mark_galeck_spam_magnet@yahoo.com> writes:


  You can always use statements within an expression.

class Alpha
{ public Alpha( final int n )
  { java.lang.System.out.println( n ); } }

class Beta extends Alpha
{ public Beta()
  { super( new java.util.concurrent.Callable<java.lang.Integer>()
      { public java.lang.Integer call()
        { int i = 0;
          i = i + 1;
          i = i + 1;
          i = i + 1;
          i = i + 1;
          return i; }}.call() ); }}

public class Main
{ public static void main( final java.lang.String[] args )
  { new Beta(); }}

4

  Of course, you can also use a separate method for all these computations:

class Alpha
{ public Alpha( final int n )
  { java.lang.System.out.println( n ); } }

class Beta extends Alpha
{
  public static int number()
  { int i = 0;
    i = i + 1;
    i = i + 1;
    i = i + 1;
    return i; }

  public Beta(){ super( number() ); }}

public class Main
{ public static void main( final java.lang.String[] args )
  { new Beta(); }}

3

  With regard to super, Java behaves like a pure functional language,
  where only such nested calls are allowed (and no sequences of statements).