Comparison Method violates its general contract in Java 7

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A comparator must return 0 if the values are equal. In your current implementation, you return 1 if they are equal. The easiest way to compare your double values correctly is to call Double.compare:

double d1 = MyUtils.calcSmoothDays(date0, new Date());
double d2 = MyUtils.calcSmoothDays(date1, new Date());

return Double.compare(d1, d2);

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