How do I calculate the number of years difference between 2 dates?

Question

How do I calculate the number of years difference between 2 calendars in Java?

Answer 1

double diff = d2.getTime() - d1.getTime();
double d = 1000 * 60 * 60 * 24 * 365;
return (int) Math.round(diff / d);

(java.lang.Math)