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- The double keyword is used to create a double primitive type.
- A double variable may store a double−precision floating point value. Double precision, as denoted by the double keyword, uses 64 bits to store a value.
- Double precision is actually faster than single precision on some modern processors that have been optimized for high-speed mathematical calculations.
- The Double class wraps a value of the primitive type double in an object. An object of type Double contains a single field whose type is double.
double Java Keyword Examples
// Compute the area of a circle.
class Area {
public static void main(String args[]) {
double pi, r, a;
r = 10.8; // radius of circle
pi = 3.1416; // pi, approximately
a = pi * r * r; // compute area
System.out.println("Area of circle is " + a);
}
}
Area of circle is 366.436224
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