Indian Railways Software Developer Interview Questions and Answers

SID stands for Security Identifier. It is a unique identifier assigned to a user, group, or computer account in Windows.

• SID is used to control access to resources in Windows

• It is a string of alphanumeric characters

• SID is generated by the Windows operating system during the creation of an account

• It is used to identify users, groups, and computers in a network

• Example: S-1-5-21-3623811015-3361044348-30300820-1013

I am a software developer with experience in Java and Python.

• Graduated with a degree in Computer Science

• Worked on multiple projects using Java and Python

• Familiar with Agile methodology

• Strong problem-solving skills

• Constantly learning and improving

Multithreading is the ability of a CPU to execute multiple threads concurrently.

• Multithreading improves performance by utilizing idle CPU time.

• Threads share the same memory space, allowing for efficient communication.

• Examples include web servers handling multiple requests and video games rendering graphics while processing user input.

The question is asking about how a specific implementation is done in Java.

• Explain the implementation details of the specific feature or functionality in Java

• Provide code examples if applicable

• Discuss any relevant libraries or frameworks used in the implementation

While loop executes only if the condition is true, do-while loop executes at least once before checking the condition.

• While loop checks the condition first, then executes the code block

• Do-while loop executes the code block first, then checks the condition

• While loop may not execute at all if the condition is false initially

• Do-while loop always executes at least once before checking the condition

No, Java does not support multiple inheritance. However, interfaces can inherit multiple interfaces.

• Java does not allow a class to inherit from multiple classes, which is known as multiple inheritance.

• However, a class can implement multiple interfaces, which is known as multiple interface inheritance.

• By implementing multiple interfaces, a class can inherit the abstract methods defined in those interfaces.

• For example, c...read more

To display data of two tables, we can use JOIN operation in SQL.

• Identify the common column(s) between the two tables.

• Use JOIN operation to combine the data from both tables based on the common column(s).

• Choose the appropriate type of JOIN operation (INNER, LEFT, RIGHT, FULL) based on the requirement.

• Use SELECT statement to display the required columns from the combined table.

• Example: SELECT t1.column1, t2.column2 FROM ...read more

Primary key uniquely identifies a record in a table, while unique key ensures uniqueness of a column.

• Primary key is a column or set of columns that uniquely identifies each record in a table

• Primary key cannot have null values

• A table can have only one primary key

• Unique key ensures that a column or set of columns have unique values

• Unique key can have null values

• A table can have multiple unique keys

I would rate myself as an 8 on a scale of 1-10.

• I have a strong understanding of software development principles and practices.

• I have experience working with multiple programming languages and frameworks.

• I am skilled in problem-solving and debugging.

• I have successfully delivered complex software projects in the past.

• I continuously strive to learn and improve my skills.

Multithreading is the ability of a program to perform multiple tasks concurrently.

• Multithreading allows for better utilization of CPU resources

• It can improve program performance and responsiveness

• Examples include running multiple downloads simultaneously or updating a GUI while performing a background task

• Synchronization is important to prevent race conditions and ensure thread safety

Multithreading in Java allows concurrent execution of multiple threads.

• Java provides built-in support for multithreading through the java.lang.Thread class.

• Threads can be created by extending the Thread class or implementing the Runnable interface.

• The start() method is used to start a new thread, which calls the run() method.

• Synchronization mechanisms like synchronized blocks and locks can be used to control access to ...read more

No, Java does not support multiple inheritance. However, interfaces can inherit multiple interfaces.

• Java does not allow a class to inherit from multiple classes.

• This is because multiple inheritance can lead to ambiguity and conflicts.

• However, a class can implement multiple interfaces in Java.

• An interface can extend multiple interfaces, allowing for inheritance of multiple interfaces.

• This is known as interface inheritan

DO-WHILE loop executes the code block at least once, while WHILE loop executes only if the condition is true.

• DO-WHILE loop checks the condition at the end of the loop

• WHILE loop checks the condition at the beginning of the loop

• DO-WHILE loop executes the code block at least once

• WHILE loop may not execute the code block at all if the condition is false

I would rate myself as an 8 on a scale of 1-10.

• I have a strong understanding of software development principles and practices.

• I have experience working with multiple programming languages and frameworks.

• I am skilled in problem-solving and debugging.

• I have successfully delivered complex software projects in the past.

• I continuously strive to learn and improve my skills.

Display data of two tables by joining them using a common column.

• Use SQL JOIN statement to combine data from two tables based on a common column.

• Choose the appropriate type of JOIN based on the relationship between the tables.

• Specify the columns to be displayed in the SELECT statement.

• Use aliases to differentiate between columns with the same name in both tables.

• Apply any necessary filters or sorting to the result set.