I dont understand

Question about the task

Under discussion

why it doesn't pass with :

Mouse mouse = new Mouse(x, y);

but this works?

void createMouse(){
       int x = (int)(Math.random() * width);
       int y = (int)(Math.random() * height);
       setMouse(new Mouse(x, y));  //Mouse mouse = new Mouse(x, y);
   }

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Guadalupe Gagnon

Level 37 , Tampa, United States

26 August 2020, 16:49

what is the rest of the code for the top? Is it this:

void createMouse(){
   int x = (int)(Math.random() * width);
   int y = (int)(Math.random() * height);
   Mouse mouse = new Mouse(x, y);
   setMouse(mouse);  //Mouse mouse = new Mouse(x, y);
}

If the code is like this:

void createMouse(){
   int x = (int)(Math.random() * width);
   int y = (int)(Math.random() * height);
   Mouse mouse = new Mouse(x, y);
}

Line 4 is creating a local variable that will go out of scope when the method ends. To the full program it would functionally be exactly the same as this:

void createMouse(){
}

David

Level 26 , Bucharest, Romania

27 August 2020, 08:05

But if I would make the createMouse() method to return new Mouse(x, y) would be that correct? return new Mouse(x, y) insead of setMouse(mouse).

Guadalupe Gagnon

Level 37 , Tampa, United States

27 August 2020, 13:19

then you would have to change the method from 'void' to

Mouse createMouse(){
   //code
   return new Mouse(x,y);
}

It wouldn't make sense because 'mouse' is a class variable (It should be declared at the top of the class).