Java . util . function . intbinaryoperator 接口带示例

原文:https://www . geesforgeks . org/Java-util-function-intbinaryoperator-interface-with-examples/

在 Java 8 中引入了intbinaryooperator接口。它表示对两个 int 值的操作，并将结果作为 int 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

  1. applyAsInt() : This function takes two Int values, performs the required operation, and returns the result as int.

    ```java public int applyAsInt(int val1, int val2)

    ```

用λ表达式演示 IntBinaryOperator 接口的示例。

// Java program to demonstrate IntBinaryOperator

import java.util.function.IntBinaryOperator;

public class IntBinaryOperatorDemo {
    public static void main(String[] args)
    {
        // Binary operator defined to divide
        // factorial of two numbers
        IntBinaryOperator binaryOperator = (x, y) ->
        {
            int fact1 = 1;
            for (int i = 2; i <= x; i++) {
                fact1 *= i;
            }
            int fact2 = 1;
            for (int i = 2; i <= y; i++) {
                fact2 *= i;
            }
            return fact1 / fact2;
        };

        System.out.println("5! divided by 7! = "
                           + binaryOperator.applyAsInt(5, 7));
        System.out.println("7! divided by 5! = "
                           + binaryOperator.applyAsInt(7, 5));
    }
}

输出:

5! divided by 7! = 0
7! divided by 5! = 42

参考:https://docs . Oracle . com/javase/8/docs/API/Java/util/function/intbinaryoperator . html

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