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I was interviewed in Jan 2025.
Swapping of 2 number without using 3rd number
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I applied via Job Portal and was interviewed before Sep 2023. There were 2 interview rounds.
Upcasting is casting a subclass to a superclass, while downcasting is casting a superclass to a subclass.
Upcasting involves converting an object of a subclass to a superclass type.
Downcasting involves converting an object of a superclass to a subclass type.
Upcasting is safe and implicit, while downcasting requires explicit casting and may throw a ClassCastException.
Example: Animal animal = new Dog(); // Upcasting
Exampl
JWT (JSON Web Token) is a method for securely transmitting information between parties as a JSON object.
JWT is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object.
It is commonly used for authentication and information exchange in web development.
JWTs consist of three parts: header, payload, and signature.
The header typically co...
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