How do you change the value of a getter method that is within an entity?

Question

I'm trying to incriment the value of a number by 1.

public void move(){
    for (Entity e:entities){ 
           e.getX()+1;
      }

Answer 1

You need to defined a setter in your Entity class.

public void setX(int x)
{
    this.x = x;
}

Then you can do

public void move()
{
    for(Entity e:entities)
        e.setX(e.getX() + 1);
}

You can't mutate the value from the getter directly, as it return the value but not the reference.

Answer 2

You can't change a property that way. You must use a setter:

public void move() {
  for (Entity e: entities){
    e.setX(e.getX()+1);
  }
}