Consumer和Begin方法如何在java功能接口内部工作

发布时间：2020-12-15 05:14:27 所属栏目：Java 来源：网络整理

导读：谁可以让我知道以下程序如何在内部工作： public class Main { public static void main(String[] args) { ConsumerString c = (x) - System.out.println(x.toLowerCase()); c.andThen(c).andThen(c).accept("Java2s.com"); }} 解决方法文档 Consumer#andTh

谁可以让我知道以下程序如何在内部工作：

public class Main {
  public static void main(String[] args) {
    Consumer<String> c = (x) -> System.out.println(x.toLowerCase());
    c.andThen(c).andThen(c).accept("Java2s.com");
  }
}

解决方法

文档 Consumer#andThen说：

Returns a composed Consumer that performs,in sequence,this operation followed by the after operation. If performing either operation throws an exception,it is relayed to the caller of the composed operation. If performing this operation throws an exception,the after operation will not be performed.

这意味着您的消费者将被接受3次,如：

v--- 1. c.accept("Java2s.com");        
c.andThen(c).andThen(c).accept("Java2s.com");
          ^          ^      
          |          |           
          |  3.  c.accept("Java2s.com");               
          |
2. c.accept("Java2s.com");

（编辑：李大同）

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