Systems Solutions & Development Technologies Software Engineer(Internship) interview questions

1.written test(4 problems were stated) -4 programming problem were stated along with test cases, you have to solve them in any language) 2.Viva through Skype(Asked questions from basic java, OOP, data structure) 1.What is encapsulation 2.How polymorphism works? 3.What is class? 4.Explain OOP