Java.util.function.DoubleBinaryOperator interface with Examples

Last Updated : 18 Jul, 2019

The DoubleBinaryOperator interface was introduced in Java 8. It represents an operation on two double values and returns the result as a double value. It is a functional interface and thus can be used as a lambda expression or in a method reference. It is mostly used when the operation needs to be encapsulated from the user.

Methods:

applyAsDouble(): This function takes two double values, performs the required operation and returns the result as a double.
```
 public double applyAsDouble(double val1, double val2) 
```

Example to demonstrate DoubleBinaryOperator interface as a lambda expression .

// Java program to demonstrate DoubleBinaryOperator 
  
importjava.util.function.DoubleBinaryOperator; 
  
publicclassDoubleBinaryOperatorDemo { 
    publicstaticvoidmain(String[] args) 
    { 
        doublex = 7.654; 
        doubley = 5.567; 
  
        // Representing addition as 
        // the double binary operator 
        DoubleBinaryOperator doubleBinaryOperator 
            = (a, b) -> { returna + b; }; 
        System.out.println("x + y = "
                           + doubleBinaryOperator 
                                 .applyAsDouble(x, y)); 
  
        // Representing subtraction as 
        // the double binary operator 
        doubleBinaryOperator 
            = (a, b) -> { returna - b; }; 
        System.out.println("x - y = "
                           + doubleBinaryOperator 
                                 .applyAsDouble(x, y)); 
  
        // Representing multiplication as 
        // the double binary operator 
        doubleBinaryOperator 
            = (a, b) -> { returna * b; }; 
        System.out.println("x * y = "
                           + doubleBinaryOperator 
                                 .applyAsDouble(x, y)); 
  
        // Representing division as 
        // the double binary operator 
        doubleBinaryOperator 
            = (a, b) -> { returna / b; }; 
        System.out.println("x / y = "
                           + doubleBinaryOperator 
                                 .applyAsDouble(x, y)); 
  
        // Representing remainder operation 
        // as the double binary operator 
        doubleBinaryOperator 
            = (a, b) -> { returna % b; }; 
        System.out.println("x % y = "
                           + doubleBinaryOperator 
                                 .applyAsDouble(x, y)); 
    } 
} 

Output:

 x + y = 13.221 x - y = 2.0869999999999997 x * y = 42.609818000000004 x / y = 1.3748877312735763 x % y = 2.0869999999999997

Reference:https://docs.oracle.com/javase/8/docs/api/java/util/function/DoubleBinaryOperator.html

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