java - Read Field from another Thread -

i i'm creating textbased game while i'm learning java. i'm having issue when i'm trying read field thread. sleep class:

package events;  public class sleep implements runnable {  public int sleep = 100;  public void run() {     while (true) {         sleep--;         system.out.println("sleep: " + sleep);         try {             thread.sleep(1000);         } catch (interruptedexception e) {             e.printstacktrace();         }         if (sleep == 50) {             system.out.println("you need eat");         }         if (sleep == 25) {             system.out.println("you realy need eat");         }         if (sleep == 10) {             system.out.println("you'r almoust dying go eat");         }         if (sleep == 0) {             system.out.println("you'r dead");         }     } }  public void printsleep() {     system.out.println("sleep: " + sleep); }  } 

then call method "printsleep" menu class , should appear sleep: 99 appear sleep: 100

menu class:

public class menu {  hunger hunger = new hunger(); sleep sleep = new sleep(); scanner scanner = new scanner(system.in);  string answer;  public void mainmenu(){     system.out.println("main menu: 1 home, 2 work, 3 shop, 4 nessecity");      answer = scanner.next();      if(answer.equals("1")){          homemenu();     } else if(answer.equals("2")){         workmenu();     } else if(answer.equals("3")){         shopmenu();     } else if(answer.equals("4")){                   hunger.printhunger();         sleep.printsleep();     } } 

edit: sorry o forgot put classes. human class:

public class human{  hunger hunger = new hunger(); thread threadhunger = new thread(hunger); sleep sleep = new sleep(); thread threadsleep = new thread(sleep);  menu menu = new menu(); scanner scanner = new scanner(system.in);  private string name; int money = 100;  public void createcharacter() {     system.out.println("type name:");     name = scanner.next();     try {         thread.sleep(500);     } catch (exception e1) {         e1.printstacktrace();     }     system.out.println("your profile been created " + name + " name , " + money + " money.\n");     try {         thread.sleep(500);     } catch (exception e2) {         e2.printstacktrace();     }      threadhunger.start();     threadsleep.start();     menu.mainmenu(); } } 

main class:

public class game {  static human human  = new human(); public static void main(string[] args) {     system.out.println("to start game create human");     human.createcharacter(); } } 

what happens here in menu class, creating new hunger , sleep objects, separate , have nothing hunger , sleep objects created , ran inside human class.

so creating human , running hunger , sleep through threads, menu doesn't see these hunger , sleep. sees ones created itself, , not running.

when create menu object, should pass hunger , sleep objects human has access them. need change menu this:

public class menu {      private final hunger hunger; // not initialized here in constructor     private final sleep sleep;        scanner scanner = new scanner(system.in);      string answer;      /**      * constructor initializes internal sleep , hunger      * values passed whoever creating , using it.      *      * @param hunger hunger object passed calling human      * @param sleep  sleep object passed calling human      */     public menu( hunger hunger, sleep sleep ) {         this.hunger = hunger;         this.sleep = sleep;     }      public void mainmenu(){         system.out.println("main menu: 1 home, 2 work, 3 shop, 4 nessecity");          answer = scanner.next();          if(answer.equals("1")){              homemenu();         } else if(answer.equals("2")){             workmenu();         } else if(answer.equals("3")){             shopmenu();         } else if(answer.equals("4")){                       hunger.printhunger();             sleep.printsleep();         }     } } 

now have menu class can receive hunger , sleep object, need change following line human:

menu menu = new menu(); 

to:

menu menu = new menu(hunger, sleep); 

now menu created has access hunger , sleep objects created inside human.

but change sleep inside sleep volatile or menu might not show correctly!

public volatile int sleep = 100; 

if have similar variable in hunger, same there.

note: changed name of method mainmenu instead of mainmenu, names of other methods called inside it. method names , variable names should start lowercase letter. type names (classes, interfaces, enums) supposed start uppercase letter.