How to deal with distinction of parameters in Java? -

i need method expects different parameters, , behave differently depending on parameters, in example:

public void dosomething(a a, b b, c c) {     dosomegeneralstuff();      if a.ispresent() {         dosomethingwitha();     }     if b.ispresent() {         dosomethingwithb();     }     if c.ispresent() {         dosomethingwithc();     } } 

an alternative this:

public void dosomething(a a) {     dosomegeneralstuff();     dosomethingwitha(); } public void dosomething(b b) {     dosomegeneralstuff();     dosomethingwithb(); } public void dosomething(c c) {     dosomegeneralstuff();     dosomethingwithc(); } 

but have bunch of redundant code in second example, that's why i'm still not satisfied. other patterns deal problem?

you can use inheritance. have common interface of a, b , c.

public void dosomething(common abc) {     dosomegeneralstuff();     abc.dosomethingwithabc(); }  interface common {     void dosomethingwithabc(); }  class implements common {  class b implements common {  class c implements common {