Java updates

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Core Java - Basics ü   What is the generic data type used for password ü   Why do we use getter and setter methods in a class? ü   What is heap memory and what is stack memory ü   Difference b/w JVM and JRE? ü   How hashcode is calculated? ü   Write immutable class ü   If immutable class has Date as field, can't it be changed? ü   Why password should be used as char array, what is the demerit of using as String? ü   What is intern method in String? ü   Advantages of immutable class ü   String class uses being immutable ü   Advantages of Object class making abstract. ü   How will you implement in your application to send notification of email to team member if some exception raised. ü   What are the different ways and strategies used in your application to handle exception? ü   How you are handling custom exception. ü   Explain OOPs and how you used in your real time application. ü   Batch Processing in Java ü   Explain polymorphism and give me