深入学习java源码之Consumer.andThen()与Predicate.test()

深入学习java源码之Consumer.andThen()与Predicate.test()

Consumer消费数据函数式接口

这个方法是用来消费数据的,如何消费,消费规则自己定义.

import java.util.function.Consumer;

/**
 * 使用Consumer函数式接口实现格式化输出
 */
public class ConsumerDemo2 {

    public static void printInfo(String[] strArr, Consumer con1, Consumer con2){

        for (int i = 0; i < strArr.length; i++) {
            con1.andThen(con2).accept(strArr[i]);
        }

    }

    public static void main(String[] args) {
        String[] strArr = {"迪丽热巴,女","郑爽,女","杨紫,女"};
        printInfo(strArr,(message)->{
            System.out.print("姓名:" + message.split(",")[0] + "。  ");
        },(message)->{
            System.out.println("性别:" + message.split(",")[1] + "。");

        });
    }
}

Consumer

提供一个T类型的输入参数，不返回执行结果

accept(T t)

StringBuilder sb = new StringBuilder("Hello ");
Consumer consumer = (str) -> str.append("Jack!");
consumer.accept(sb);
System.out.println(sb.toString());	// Hello Jack!

andThen(Consumer