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Editor to share with you what is the use of the keyword strictfp in the Java language, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Since Java2, the Java language has added a keyword strictfp, which is rarely used in most situations, but it's important to know about it.

Strictfp means FP-strict, which means precise floating point. When the Java virtual machine performs floating-point operations, if the strictfp keyword is not specified, the compiler and running environment of Java take an approximate behavior to complete these operations on floating-point expressions, so that the results are often not satisfactory to you. Once strictfp is used to declare a class, interface, or method, the declared scope of the Java compiler and runtime environment will be executed in full accordance with the floating-point specification IEEE-754. So if you want to make your floating-point operations more accurate and not because the results performed on different hardware platforms are inconsistent, use the keyword strictfp.

You can declare a class, interface, and method as strictfp, but do not allow methods and constructors in the interface to declare the strictfp keyword, such as the following code:

1. Legal use of the keyword strictfp

Strictfp interface A {} public strictfp class FpDemo1 {strictfp void f () {}}

two。 The wrong way to use

Interface A {strictfp void f ();} public class FpDemo2 {strictfp FpDemo2 () {}}

Once the keyword strictfp is used to declare a class, interface, or method, all floating-point operations within the scope declared by this keyword are accurate and conform to the IEEE-754 specification. For example, if a class is declared as strictfp, then all methods in that class are strictfp.

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