2 rounds of technical evalution o1, o2 String s="b"; String s1=new String("s"); can we overide static methods whats method hiding immutablity encapsulation contract of equals and hashcode concurrent collections-concurrent hashmap aggregation and composition in java string literal sleep and wait in thread run in thread t.run() transient keyword in java flatmap rest controller is combination of 2 classes spingbootapplication is combination of 3 classes @component in spring what are diffrent types of ioc containers