java - What is the difference between these two implementations? -

i'm learning java , have come across 2 ways same thing. question is: difference between them? thanks.

option a:

class foo {     public static int var;      foo (){         var = 0;     }      public static void main(string[] args) {         foo object = new foo();         object.method();         system.out.println(object.var); //prints 1     }      public void method (){         var++;     } } 

option b:

class foo {     public static int var;      foo (){         var = 0;     }      public static void main(string[] args) {         foo object = new foo();         method(object);         system.out.println(object.var); //prints 1     }      public static void method (foo object){         object.var++;     } } 

to reinforce @eckes mentioned above -

there's more common in samples different - both obscure , promote bad practice understanding class members

note: can refer static fields object reference

mybike.numberofbicycles

but discouraged because not make clear class variables.

clean way increment static variable in case: foo.var++ , in real life example it's wrong have mutable static variables. if your're beginner.