strictfp keyword in java

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
  }
  

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  //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());     } }

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  Output:

  
  
  
  

  1.006E11
  

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