Siemens Java Developer Interview Questions and Answers

Q1. OOPs concepts and program on linked list reversal and c pointer concepts
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Q1. OOPs concepts,C basis, IPC and signals
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Q1. OOPs concepts, c basics, data structures
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Q1. Share details of your previous job.
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Q2. What are your salary expectations?
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Q3. What is your family background?
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Q4. Why are you looking for a change?
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Q5. Tell me about yourself.
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Q1. What is copy constructor?
Ans. 
Copy constructor is a special type of constructor which creates a new object as a copy of an existing object.
• Copy constructor is used to initialize a new object as a copy of an existing object.

• It takes an object of the same class as a parameter.

• It is called automatically when a new object is created from an existing object.

• Example: class MyClass { public: MyClass(const MyClass& obj) { // copy constructor logic } };
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Q2. Difference between copy constructor and assignment operator
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Copy constructor is used to create a new object as a copy of an existing object, while assignment operator is used to assign values from one object to another.
• Copy constructor is called when a new object is created from an existing object, while assignment operator is called when an existing object is assigned values from another object.

• Copy constructor creates a new object with its own memory space, while assignment o...read more
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Q3. What is static function
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A static function is a function that is associated with a class rather than an instance of the class.
• Static functions can be called without creating an instance of the class.

• Static functions are commonly used for utility functions that do not require access to instance-specific data.

• Static functions are declared using the 'static' keyword in many programming languages.

• Example: 'Math.max()' in JavaScript is a static fun
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Q4. Write Fibonacci series
Ans. 
Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.
• Start with 0 and 1 as the first two numbers in the series

• Add the previous two numbers to get the next number in the series

• Repeat this process to generate the Fibonacci series
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Q5. What is single ton design pattern
Ans. 
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
• Ensures a class has only one instance

• Provides a global point of access to that instance

• Commonly used in scenarios where only one instance of a class is needed, such as database connections or logging
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Q1. What is the concept of virtual inheritance in relation to vtables and vptrs in object-oriented programming?
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Virtual inheritance allows a derived class to inherit from a base class without creating duplicate base class subobjects.
• Virtual inheritance is used to resolve the Diamond Problem in C++ where a class inherits from two classes that have a common base class.

• It ensures that only one copy of the base class is inherited by the derived class.

• Virtual inheritance introduces a virtual base class subobject to the derived class,...read more
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Q2. Explained about vtptr and vtable initialisation and structure
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Q1. What is the implementation of a class for string operations?
Ans. 
A class for string operations can include methods for concatenation, substring extraction, length calculation, etc.
• Create a class with methods like concatenateStrings, extractSubstring, calculateLength, etc.

• Use string manipulation functions like substring, concat, length, etc. within the class methods.

• Ensure error handling for edge cases like empty strings or out-of-bounds indices.

• Example: class StringOperations { conc...read more
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Q1. About projects, how do they work, what all have you implemented
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Q2. One simple question on average of array elements
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Q1. Just based on resume
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Q1. Tell me about your projects
Ans. 
I have worked on various projects including web development, mobile app development, and data analysis.
• Developed a web application using React and Node.js for a client in the e-commerce industry

• Created a mobile app using Flutter for tracking daily expenses

• Performed data analysis on customer feedback data using Python and SQL
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Q2. He gave me a DSA question.
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Q3. Asked about oops concepts
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Q4. Asked about dbms
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