Is Double.MIN_VALUE is greater than zero in Java?

问题

I found a bug in my code which boiled down to comparing Double(0.0) with Double.MIN_VALUE. Essentially, the following returns false:

System.out.println(0.0 > Double.MIN_VALUE);

How is this possible?

回答1:

According to the javadoc for Double.MIN_VALUE, MIN_VALUE is:

A constant holding the smallest positive nonzero value of type double

So Double.MIN_VALUE is not negative, it's the positive value that's as close as a Double can get to zero (without being zero).

回答2:

Double.MIN_VALUE is the smallest positive non-zero value which can be represented by a Java double (see the JavaDoc at http://download.oracle.com/javase/8/docs/api/java/lang/Double.html).

来源：https://stackoverflow.com/questions/5709073/is-double-min-value-is-greater-than-zero-in-java