How to set required constants for methods?

Question

I am creating a method called setState and I want to use binary operators for it, but I want to create something to check if the passed argument is a constant defined in the class:

public static final int STATE1 = 0b1;
public static final int STATE2 = 0b10;
public static final int STATE3 = 0b100;
public void setState(int stateType, boolean state){
    if(state){
        this.state |= stateType;
    }else{
        this.state &= ~stateType;
    }
 }

So when I type setState(10, false) it will say: Wrong argument type, found x, required y

Answer 1

you only want stateType to be one of STATE1, STATE2, or STATE3? You could use an enum defined in that class. Something like:

public class MyClass{
    public enum State{
        STATE1 (0b1),
        STATE2(0b10),
        STATE3(0b100);

      public final int value;
      State(int value){
        this.value = value;
      }
    }

   public void setState(State stateType, boolean state){
    if(state){
        this.state |= stateType.value;
    }else{
        this.state &= ~stateType.value;
    }
  }
}