Java8 BinaryOperator

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package com.lgx.jdk8.part01;import java.util.Comparator;import java.util.function.BiFunction;import java.util.function.BinaryOperator;/** * BinaryOperator的讲解 */public class Test13BinaryOperator {    public static void main(String[] args) {        Test13BinaryOperator test = new Test13BinaryOperator();        Double result = test.biFunctionCompute(10.0, 15.0, (value1, value2) -> value1 + value2);        System.out.println("result = [" + result + "]");        Double result2 = test.binaryOperatorCompute(10.0, 15.0, (value1, value2) -> value1 + value2);        System.out.println("result2 = [" + result2 + "]");        Double minResult = test.binaryOperatorMinBy(100.0, 150.0, Double::compareTo);        System.out.println("数字较小minResult = [" + minResult + "]");        Double maxResult = test.binaryOperatorMaxBy(100.0, 150.0, Double::compareTo);        System.out.println("数字较大maxResult = [" + maxResult + "]");        String minResult2 = test.binaryOperatorMinBy2("hello", "hello world", (a, b) -> a.length() - b.length());        System.out.println("长度较短minResult2 = [" + minResult2 + "]");        String minResult3 = test.binaryOperatorMinBy2("hello", "hello world", String::compareTo);        System.out.println("长度较短minResult3 = [" + minResult3 + "]");        String minResult4 = test.binaryOperatorMinBy2("hello", "world123", (a, b) -> a.charAt(0) - b.charAt(0));        System.out.println("首字母在前面的minResult4 = [" + minResult4 + "]");        String maxResult2 = test.binaryOperatorMaxBy2("hello", "hello world", String::compareTo);        System.out.println("长度较长maxResult2 = [" + maxResult2 + "]");    }    //BiFunction写法    public Double biFunctionCompute(Double para1, Double para2, BiFunction<Double, Double, Double> biFunction){        return biFunction.apply(para1, para2);    }    //BinaryOperator写法    public Double binaryOperatorCompute(Double para1, Double para2, BinaryOperator<Double> binaryOperator){        return binaryOperator.apply(para1, para2);    }    //获取2个double中较小的那个    public Double binaryOperatorMinBy(Double para1, Double para2, Comparator<Double> comparator){        return BinaryOperator.minBy(comparator).apply(para1, para2);    }    //获取2个double中较大的那个    public Double binaryOperatorMaxBy(Double para1, Double para2, Comparator<Double> comparator){        return BinaryOperator.maxBy(comparator).apply(para1, para2);    }    public String binaryOperatorMinBy2(String para1, String para2, Comparator<String> comparator){        return BinaryOperator.minBy(comparator).apply(para1, para2);    }    public String binaryOperatorMaxBy2(String para1, String para2, Comparator<String> comparator){        return BinaryOperator.maxBy(comparator).apply(para1, para2);    }}
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