java - Different static fields from class and sublclasses -

java - Different static fields from class and sublclasses -

i'm newbie of java, , english language not good... excuse me in advance :)

i have superclass: genericresource static field count how many instances created, , method invoke value:

public class genericresource { private static int counter; public genericresource() { counter++; } public static int howmany() { homecoming counter; } //other useful code here }

and want create semi-identical subclasses, each specific resource:

public class type1resource extends genericresource { // here specific code }

now, in main class:

genericresource a1 = new genericresource(); genericresource a2 = new genericresource(); type1resource b = new type1resource(); type1resource b2 = new type1resource(); int howa = genericresource.howmany(); int howb = type1resource.howmany();

and i'm expecting i'm using 2 different counter static fields, 1 superclass genericresource, , 1 subclass type1resource. desired result : howa = 2 howb = 2. real result is: howa 4 howb 4.

so i'm using same counter static field if i'm instantiate 2 different classes, while need need instead refer @ different counter static fields, 1 each subclass, mantaining @ same time, static methods construction of superclass. how can do?

static variables pertain class, hence counter referencing in both genericresource , type1resource genericresource.counter (through implicit parameter-less constructor invocation in kid class), hence value 4 after 2 instances of each.

declare static counter in type1resource, , increment in specific type1resource constructor if want count instances only.

i suggest using different name new counter well, clarity.

java