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Is 'final' keyword always safe to add/remove?

If somebody asked me this question “Is it always safe to put/remote ‘final’ keyword on a read only local variable?”, honestly I would have answered “Yes”.

Until I read JavaPuzzlers by Joshua Bloch and Neal Gafter and realized what a little variant of puzzle #8 would look like:

What’s the output of this code?

public static void main(String[] args)
    int z1 = 0;
    final int z2 = 0;

    System.out.println(false ? z1 : 'X');
    System.out.println(false ? z2 : 'X');
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