Java Do and While validation -

i created simple program there password, reason if input password program carry on executing though used , while.

import java.util.scanner;  public class passcheck {   double password;   int userinp;    public void validation() {      do{           system.out.println("please enter password");          scanner in = new scanner(system.in);          int password = in.nextint();      } while (password == 1111);       system.out.println("please select whether workout area or perimeter");      system.out.println("enter 1 area , enter 2 perimeter");      scanner in = new scanner(system.in);      int userinp = in.nextint();       switch (userinp){         case 1:             circlearea circleareaobject = new circlearea();                 circleareaobject.area();         case 2:      }   } } 

your int password assign valid inside brackets of { ... } block. in while, referencing double password never 1111.

do{      system.out.println("please enter password");     scanner in = new scanner(system.in);     int password = in.nextint();  // "password"... } while (password == 1111); // not same variable this... 

in while(password = 1111) referencing double password (as mentioned, why double? ). cannot reference local int password here, since it's scope limited insides of brackets above.