1.what is collection and collections 2.what is throw and throws 3.count the number of frames in a webpage 4.what is treemap and hashmap 5.what is webelement,webdriver,alert and action 6.what are checked and unchecked exception with examples 7.what are selenium exceptions 8.what is scenario and scenario outline 9.what is the main use of maven 10.prograk to reverse words in a sentence 11.program to convert lowercase data to upper case and vice versa 12.what is base class in java 13.what is parent class of exceptions. 14.what is overloading and overriding 15.what are cucumber keywords 16.what is constructor and constructor chainy 17.what is string and string buffer