This project forked from hcsp/fix-process-hanging
Java advanced practice: process hangs
小明写了一个Executor，希望实现并发执行任务并将得到的结果串行执行，但是却没有达到目的。请帮助他找到问题并修复之。
这个问题来源于一个真实项目中的问题：pinterest/ktlint#277
在提交Pull Request之前，你应当在本地确保所有代码已经编译通过，并且通过了测试(mvn clean verify)
注意！我们只允许你修改以下文件，对其他文件的修改会被拒绝：
完成题目有困难？不妨来看看写代码啦的相应课程吧！
回到写代码啦的题目，继续挑战！
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