1. Explain oops and its 4 pillars 2. Explain polymorphism with real life example ( tv or mobile phone) 3. Method overloading and overriding wrt mobile and told me to write class and show the example of both. 4. Why new keyword in java and 2 coding questions ( array based) + 1 to check loop in linkedlist question( only explain no code) 5.Primary vs unique key in dmbs 6. What is Normalisation 7.Explain types of normalisations 8. Problem on normalisation with 1Normal form satisfied so i had to make it 2nd Normal form and 3rd Normal form. 9. Composition and aggregation in dmbs

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OOPs is a programming paradigm that focuses on objects and their interactions.
The four pillars of OOPs are encapsulation, inheritance, polymorphism, and abstraction.
Polymorphism allows objects of different types to be treated as objects of a common type.
Method overloading is having multiple methods with the same name but different parameters.
Method overriding is having a method in a subclass with the same name and parameters as in the superclass.
The 'new' keyword in Java is used to create an instance of a class.
Primary key uniquely identifies a record in a database table.
Unique key ensures that the values in a column are unique.
Normalization is the process of organizing data in a database to eliminate redundancy and improve efficiency.
There are different normal forms like 1NF, 2NF, and 3NF to ensure data integrity and eliminate anomalies.
Composition is a strong form of association where the lifetime of the associated objects is dependent on the container object.
Aggregation is a weak form of association where the associated objects can exist independently of the container object.

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