Jaypee Infratech System Engineer Interview Questions and Answers

Android architecture stack is a set of layers that make up the Android operating system.

• The stack includes four main layers: Linux kernel, native libraries, Android runtime, and application framework.

• The Linux kernel provides low-level system functionality.

• Native libraries are written in C or C++ and provide access to hardware-specific features.

• The Android runtime includes the Dalvik virtual machine and core libraries.

• ...read more

AIDL stands for Android Interface Definition Language, used for inter-process communication in Android.

• AIDL is used to define the interface between client and service in Android.

• It allows communication between different processes in Android.

• AIDL is used to pass complex data types between processes.

• AIDL is similar to Remote Procedure Call (RPC) in other programming languages.

• Example: AIDL is used in Android to implement...read more

Hash set and hash map are data structures used to store key-value pairs for efficient retrieval.

• Hash set stores unique values without any specific order.

• Hash map stores key-value pairs and allows fast retrieval of values based on keys.

• Both use hashing to map keys to their corresponding values.

• In Java, HashSet and HashMap are implementations of these data structures.

Compile time polymorphism is achieved through function overloading and templates.

• Function overloading allows multiple functions with the same name but different parameters.

• Templates allow generic programming by defining functions or classes that can work with different data types.

• Examples of function overloading include cout<< for different data types and sqrt() for float and double.

• Examples of templates include vector

Connecting to a database has multiple options depending on the type of database and programming language used.

• For SQL databases, options include using JDBC for Java, ODBC for C++, and ADO.NET for C#.

• For NoSQL databases, options include using MongoDB's driver for Python or Node.js.

• ORMs like Hibernate and Entity Framework can also be used to abstract away the database connection details.

• Connection strings are used to spe...read more