Java . util . function . DoubleBinaryOperator 接口示例
原文:https://www . geeksforgeeks . org/Java-util-function-double binaryoperator-interface-with-examples/
在 Java 8 中引入了双二进制运算符接口。它表示对两个双精度值的操作，并将结果作为双精度值返回。这是一个功能接口，因此可以用作 lambda 表达式或方法引用。它主要用于需要从用户封装操作的时候。
方法:
-
[applyastdouble ()] : This function takes two double precision values, performs the required operation, and returns the result as double precision.
```java public double applyAsDouble(double val1, double val2)
```
将双二进制运算符接口演示为λ表达式的示例。
// Java program to demonstrate DoubleBinaryOperator
import java.util.function.DoubleBinaryOperator;
public class DoubleBinaryOperatorDemo {
public static void main(String[] args)
{
double x = 7.654;
double y = 5.567;
// Representing addition as
// the double binary operator
DoubleBinaryOperator doubleBinaryOperator
= (a, b) -> { return a + b; };
System.out.println("x + y = "
+ doubleBinaryOperator
.applyAsDouble(x, y));
// Representing subtraction as
// the double binary operator
doubleBinaryOperator
= (a, b) -> { return a - b; };
System.out.println("x - y = "
+ doubleBinaryOperator
.applyAsDouble(x, y));
// Representing multiplication as
// the double binary operator
doubleBinaryOperator
= (a, b) -> { return a * b; };
System.out.println("x * y = "
+ doubleBinaryOperator
.applyAsDouble(x, y));
// Representing division as
// the double binary operator
doubleBinaryOperator
= (a, b) -> { return a / b; };
System.out.println("x / y = "
+ doubleBinaryOperator
.applyAsDouble(x, y));
// Representing remainder operation
// as the double binary operator
doubleBinaryOperator
= (a, b) -> { return a % b; };
System.out.println("x % y = "
+ doubleBinaryOperator
.applyAsDouble(x, y));
}
}
输出:
x + y = 13.221
x - y = 2.0869999999999997
x * y = 42.609818000000004
x / y = 1.3748877312735763
x % y = 2.0869999999999997
参考:https://docs . Oracle . com/javase/8/docs/API/Java/util/function/double binaryoperator . html
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