To get a real length of an array

if there is an array not full,how do i calcuate how many elements in an array are??
for example:
ARRAY A={"A","B","NULL","NULL"};
HOW TO FIND THE LENGTH IS "TWO"
THANKS IN ADVANCE

String[] a = {"a", "b", "null", "null"};
has length four as well as having four filled Strings in it.
however..
String[] a = new String[4];
a[0] = "a";
a[1] = "b";
and you want to find out that there are two in it?
then count like r.klemme said.
int count =0;
for (int i=0;i<a.length;i++) {
if (a[i] != null) count++;
System.out.println("array " + a + " has length=" + a.length + " with " + count + "units in it");

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2 /
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To get a real length of an array

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