Chapter 13 Cheatsheet
How to create threads?
Concurrent classes?
当我们使用 concurrent class 时，是为了解决不同 threads 在不同时间去更改同一个 collection 的 data 而导致 data 不统一的状况，不然就会遇到 ConcurrentModificationException。
如果那个 collection 是 immutable 的话，那我们就没必要用到 concurrent class
Threading problems
- Deadlock: When two or more threads are blocked forever, each waiting on the other.
- Starvation: When a single thread is perpetually denied access to a shared resource or lock.
- Livelock: When two or more threads are conceptually blocked forever, although they are each still active and trying to complete their task.