1. abhilashts's Avatar
    i am a complete beginner
    here is the code

    //get a reference to textview
    TextView brands=(TextView) findViewbyid(R.id.brands);

    //get a reference to spinner
    Spinner brands=(Spinner) findViewbyid(R.id.brands);

    what is happening in the above code

    thank you
    01-03-2016 01:30 PM
  2. ManiacJoe's Avatar
    A variable is a named "box" that you put data into.
    integer x = 7;
    integer y = 4;
    x = y; // x got a copy of the data in y

    A pointer is a variable that contains the memory address of a variable. This is used to "point at" other variables and change their data.
    integer x = 7;
    integer & p = null; // points to "nothing"
    p = &x // p now points to x
    *p = 12; // the contents of what p points to (x) now is 12

    A reference is a pointer that cannot point to "nothing". Using a pointer that points to "nothing" will crash the app.
    01-03-2016 04:55 PM

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