sonar——Synchronized classes Vector, Hashtable, Stack and StringBuffer should not be used
It is better to use their new unsynchronized replacements:
ArrayList
orLinkedList
instead ofVector
Deque
instead ofStack
HashMap
instead ofHashtable
StringBuilder
instead ofStringBuffer
Noncompliant Code Example
Vector cats = new Vector();
Compliant Solution
ArrayList cats = new ArrayList();
Exceptions
Use of those synchronized classes is ignored in the signatures of overriding methods.
@Override public Vector getCats() {...}