Difference between creating an instance variable and creating a new object in Java?

Question

I understand the difference between creating an object and creating a variable. For example:

private int number;
MyClass myObj = new MyClass();

Answer 1

private MusicPlayer player;

It's a declaration, This means to make a new reference variable of MusicPlayer, just a reference, and no instance will be created. You cannot use it because it points to null.

player  = new MusicPlayer();

MusicPlayer() calls the MusicPlayer constructor, new create a instance of MusicPlayer, = assigns this instance to the reference player.