Paranthesis use

[adityajain]

Well ! I have a confusion.When we length of an array we just use a.length; but to find length of an string we use S.length();.Why paranthesis are not used in case of array,however to call any method we use paranthesis?

I have a other problem too,i created an object of self defined class MyObject.Now how can i give the string behavior to the object i made,for e.g. the objects can be concated(concat ed because object should behave like string)?

[r035198x]

Well ! I have a confusion.When we length of an array we just use a.length; but to find length of an string we use S.length();.Why paranthesis are not used in case of array,howvr to call any method we use paranthesis??

[CODE=java]Class Why {
static int aField = 0;
static int aMethod() {
return 0;
}
}[/CODE]

You say Why.aField
and
Why.aMethod();

[adityajain]

No!! take this as example:

class Why
{ int a[] ={1,5,8,3,0,6};
String S ="Why it happen";
int l_array,l_strin g;
l_array = a.length; // return 6
l_string = S.length(); // return 13
}

I mean Why a.length;
and
S.length();

[r035198x]

No!! take this as example:

class Why
{ int a[] ={1,5,8,3,0,6};
String S ="Why it happen";
int l_array,l_strin g;
l_array = a.length; // return 6
l_string = S.length(); // return 13
}

I mean Why a.length;
and
S.length();

But if you look at my example again, you would see why.
One is a field and the other is a method.

[JosAH]

No!! take this as example:

class Why
{ int a[] ={1,5,8,3,0,6};
String S ="Why it happen";
int l_array,l_strin g;
l_array = a.length; // return 6
l_string = S.length(); // return 13
}

I mean Why a.length;
and
S.length();

As r035198x already wrote: the length field for arrays is, well, a field, whille
the length() method for a String is a method. Arrays are a bit funny: they're all
objects and direct decendants of the Object class; they're all final (non-extendable)
as well and they don't have methods defined themselves (you can use Object's
methods on arrays though).

Arrays always have been a difficult thing when it comes to object oriented
programming. A 'Derived' may be a 'Base' but an array of 'Derived' isn't an
array of 'Base'; don't get me started on this ;-)

Just remember that arrays are a bit funny.

kind regards,

Jos