Danlaw Inc Interview Questions and Answers for Experienced

Q1. What is a pointer to pointer
Ans. 
A pointer to pointer is a variable that stores the memory address of another pointer variable.
• It is used to create dynamic data structures like linked lists and trees.

• It allows multiple levels of indirection.

• It is denoted by ** in C and C++.

• Example: int **ptr;

• Example: ptr = &p; where p is a pointer variable.
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Q2. Class, object, inheritance, polymorphism,dbms
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Q1. What are the main principles of the Java
Ans. 
Main principles of Java include object-oriented programming, platform independence, and automatic memory management.
• Object-oriented programming: Java is based on classes and objects, allowing for encapsulation, inheritance, and polymorphism.

• Platform independence: Java code can run on any platform that has a Java Virtual Machine (JVM) installed.

• Automatic memory management: Java uses garbage collection to automatically m
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Q2. What is the different between == and equals method
Ans. 
The == operator compares the memory addresses of two objects, while the equals method compares the content of two objects.
• The == operator is used to compare the memory addresses of two objects in Java.

• The equals method is used to compare the content of two objects in Java.

• Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will return false, but str1.equals(str2) will return true
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Q1. What is jdk, string related questions, basic java oops questions?
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Q1. Normal question about past experience
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Q2. When you can join and all
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SQL test on Select query, insert, create

Array and OOPS concept. Given set of questions to solve with each oops concept

Q1. Out of box thinking. Given logical puzzles and ask you to analyze and provide your understanding
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Q2. Explain the inheritance concept with car model
Ans. 
Inheritance in car model refers to the ability of a new car model to inherit features and characteristics from an existing car model.
• Inheritance allows for the creation of a new car model that shares common features with an existing car model

• The new car model can add or modify features inherited from the existing car model

• For example, a new sports car model can inherit features from a base car model such as engine, tra...read more
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Q3. Probability question with fruits and boxes
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Q1. What is Linked List
Ans. 
A linked list is a linear data structure where elements are stored in nodes with each node pointing to the next node in the sequence.
• Consists of nodes connected by pointers

• Can be singly linked (each node points to the next) or doubly linked (each node points to the next and previous)

• Allows for dynamic size and efficient insertion/deletion operations
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Q1. What are different agile methodologies
Ans. 
Agile methodologies are iterative and flexible approaches to project management.
• Scrum: Focuses on delivering small increments of work in short iterations called sprints.

• Kanban: Visualizes work on a board and limits work in progress to improve flow.

• Extreme Programming (XP): Emphasizes continuous feedback, frequent releases, and close collaboration.

• Lean: Aims to eliminate waste and maximize customer value through continu...read more
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Q2. Difference between BRD and FRD
Ans. 
BRD and FRD are both documents used in the software development process, but they serve different purposes.
• BRD stands for Business Requirements Document and focuses on the business needs and objectives of a project.

• FRD stands for Functional Requirements Document and outlines the specific functionalities and features of a software system.

• BRD is more high-level and describes the 'what' and 'why' of a project, while FRD i...read more
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