Equals operator for zeros (BigDecimal / Double) in Java

Question

A few interesting observations w.r.t equals operator on 0 and 0.0

1. new Double(0.0).equals(0) returns false, while new Double(0.0).equals(0

Answer 1

new Double(0.0).equals(0)

This line compares a double value of 0 (which is not exact zero) with integer of 0.

BigDecimal.ZERO.equals(BigDecimal.valueOf(0.0))

BigDecimal will compare the scale length in the equals operation.