funny no problem on 1.5.

try this:

System.out.println(a < aantal ? Integer.toString(a) : "");

or this:

if(a < aantal ) System.out.println(a);

The 1st is the 'ternary operator'

booleanExp ? exprA : exprB

it basically says if booleanExp evaluates to true make the whole statement
evaluate to exprA otherwise exprB.

It is a condensed form of an if/else statement.

Your System.out.println() is overloaded to accept just about anything and as
such I thought my odd, confusing and unhelpful ;-) though untested reply
would be okay.  Just tried it on mine though and it is fine.

Normally you would do something like:

String s = a < aantal ? Integer.toString(a) : ""

my original

String s = a < aantal ? a : ""

is nonsense because if it evaluates true then it tries to assign an int to a
String, but because the System.out.println is overloaded it should be okay.