Reference: https://www.cnblogs.com/yjd_hycf_space/p/7760248.html
thread safe:
- Vector
- HashTable
- StringBuffer
Thread unsafe:
- ArrayList :
- LinkedList:
- HashMap:
- HashSet:
- TreeMap:
- TreeSet:
- StringBulider:
Reference: https://www.cnblogs.com/yjd_hycf_space/p/7760248.html
thread safe:
Thread unsafe: