Double variable

double is a Java primitive type. A double variable may store a double−precision floating point value. Examples Remarks

Since floating point data types are approximations of real numbers, you should generally never compare floating point numbers for equality.

Java floating point numbers can represent infinity and NaN (not a number). The Double wrapper class defines the constants MIN_VALUE, MAX_VALUE, NEGATIVE_INFINITY, POSITIVE_INFINITY and NaN.

double ratio = .01;
double diameter = 6.15;
double height = 1.35E03; // 1.35 * 103 or 1350.0
double height = 1e−2; // 1.0 * 10−2 or 0.01

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