Wipro interview questions

Circuit breaker stage
Microservice design patttern
Controller advise
@springbootapplication
Dispatcher servlrt
Class A have m1() and class B has m1() throws.. class B is overriding class A method m1() but using throws in B class
String a = "hell0" String a = new string ("Hello") how many object will create
Throw vs throws
Fail-Fast vs Fail-Safe Iterator
Hashmap vs Hash tables
ConcurrentHashMap
Constructer can be private ? 
I am using third party libraries there is one class, how to sort employee object -Comparator Runnable vs callable
Call run() without calling start() what will happen - es, you can call run() without calling start(), but it will not create a new thread.
All product name coming in product category Write the stream code. 
Reduce() vs collect()

When do you know a database is well desgined