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Static class instantiation

  Asked By: Bill    Date: Sep 21    Category: Java    Views: 1085

If I have the following code and call method_1 then tmp1 is
instantiated. When method_1 is through tmp1 is destroyed. If I call
method_2 will the newly instantiated class tmp2 refer to the static
class created in method_1 or will it create a new static class?

class a(
public a(){}
void method_1(){b tmp1 = new b();}
void method_2(){b tmp2 = new b();}

class b(
static c tmpc = new c();
public b(){}

class c(
public c(){}



1 Answer Found

Answer #1    Answered By: Calais Bernard     Answered On: Sep 21

tmpc is a static  variable so there is only one copy for all objects
of the c class. Your method_1 and method_2 create  2 objects of
the b class, but each holds a reference to the same object of the
c class. After creating the b objects, try testing to see if they
the same tmpc object:

public class  StaticTest {
public static void  main(String [] args) {
b tmp1 = new b();
b tmp2 = new b();
if(tmp1.tmpc == tmp2.tmpc)
System.out.println("Only one c object");

to see if they are the same object. (Using == will only evaluate
true if the reference variables point to the same object). It prints
that line of course.

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