strictfp is a keyword in java used for restricting floating-point calculations and ensuring same result on every platform while performing operations in the floating-point variable.
Floating point calculations are platform dependent i.e. different output(floating-point values) is achieved when a class file is run on different platforms(16/32/64 bit processors). To solve this types of issue, strictfp keyword was introduced in JDK 1.2 version by following IEEE 754 standards for floating-point calculations.
-
Important points:
- strictfp modifier is used with classes, interfaces and methods only.
strictfp class Test { // all concrete methods here are // implicitly strictfp. } strictfp interface Test { // all methods here becomes implicitly // strictfp when used during inheritance. } class Car { // strictfp applied on a concrete method strictfp void calculateSpeed(){} }
- When a class or an interface is declared with strictfp modifier, then all methods declared in the class/interface, and all nested types declared in the class, are implicitly strictfp.
- strictfp cannot be used with abstract methods. However, it can be used with abstract classes/interfaces.
- Since methods of an interface are implicitly abstract, strictfp cannot be used with any method inside an interface.
strictfp interface Test { double sum(); strictfp double mul(); // compile-time error here }
//Java program to illustrate strictfp modifier
public
class
Test
{
// calculating sum using strictfp modifier
public
strictfp
double
sum()
{
double
num1 = 10e+
10
;
double
num2 = 6e+
08
;
return
(num1+num2);
}
public
static
strictfp
void
main(String[] args)
{
Test t =
new
Test();
System.out.println(t.sum());
}
}
Output:
1.006E11
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