How to declare global variables which doesn't change the value

Question

I have a function in whitch I use a global variable, and in this function I update this variable. I want to not update the value of this varible outside of this function.

public static int a = 0; //is global 
public static int b = 0;

 public void func(){
  if(a>c){
    a=a+b;
     }
 }

This function is called at 100ms

         final Handler handler = new Handler();
          Runnable runnable = new Runnable() {
            @Override
            public void run() {
            func();
               handler.postDelayed(this, 100);
           }
            };
            handler.postDelayed(runnable, 100);

Why "a" is initalized with zero everytime?

I want to do something like this:

 public void func(){
  int a=0;
  int b=0;
  while(a>c){
    a=a+b;
     }
 }

But I cannot to use while, because "c" is computed in another function, and if I use while, the value of "c" is not changed...

How I can solve this problem?

score 0 · Answer 1 · answered Dec 29 '18 at 12:32

0

Make function static. Static variables are changed by static functions.

answered Dec 29 '18 at 12:32

Virgil Ionescu

327
1
4
9

It is not possible, because in this function I call sent() function, that transmit messages via bluetooth. If I make "func()" static, I need to make send() static, which is not possible – user3628339 Dec 29 '18 at 12:51
https://stackoverflow.com/questions/2042813/calling-non-static-method-in-static-method-in-java – Virgil Ionescu Dec 29 '18 at 12:57
My send() function is in the same class with func(). I will make a instance of current class? – user3628339 Dec 29 '18 at 13:08
I think you have to separate them in some way. Otherwise, i think a will start always with 0. – Virgil Ionescu Dec 29 '18 at 17:35

How to declare global variables which doesn't change the value

1 Answers1