PwC Senior Software Developer interview questions

Most irrelevant to the project and expecting to explain about JDK internal binaries. If we know about JDK development, we would be working in Oracle; not this pathetic organization.

what happens if we give return type to constructor ? what happens if we give final to class ? super class of all Exception type classes ? what is serialiazation ? Exception thrown by loadclass() method of ClassLoader class ? All the variables of interface should be ? What is it called where child object gets killed if parent object is killed ? method overloading signature ? What is runTime Polymorphism ? Internal implemtation of hashmap? Design pattern - abstarct pattern, factory pattern, singleton Pattern ? Write code for singleton pattern ? Why to give private for constructor ? what is garbage collection ? What is String Constant pool ? What is aggregation and composition ? Difference between linkedList and ArrayList ? Difference between comparator and comparable ? Which collection preserve insertion order ? What is hashcode and equals contract ? Different types of Exceptions ? What is InstanceOf ? What is Encapsulation ? What is Dependency injection ? What are Session method ? What to do to secure webflows with spring security ? What is hibernate.dialect property in hibernate configuration ? what are different state of objects in hibernate ? Interfaces of hibernate ? Write an SQL query to print the second highest salary of employees ? Difference between rest and soap ? Spring boot Data JPA ? Methods of Rest ? Why angular or react ? Architectural Difference between your proj and angular ? Java 8 new features ? Difference between java7 and java 8 ?