Hitachi Consulting Interview Questions and Answers

An ellipse is a closed curve that is shaped like a stretched circle.

• It has two focal points, which are equidistant from the center.

• The sum of the distances from any point on the ellipse to the two focal points is constant.

• Ellipses are commonly used in mathematics, physics, and engineering.

• Examples of ellipses include the orbits of planets around the sun and the shape of some lenses and mirrors.

Lookup is used to find a specific value in a table while extract is used to retrieve a subset of data from a larger dataset.

• Lookup searches for a specific value in a table and returns a related value from the same row or column.

• Extract retrieves a subset of data from a larger dataset based on certain criteria.

• Lookup is used to join tables while extract is used to filter data.

• Lookup is commonly used in Excel while extra...read more

Yes, lookup can be used in a single rule.

• Lookup can be used to retrieve data from another table or object.

• It can be used in a single rule to fetch data and use it in the current rule.

• Lookup can be used with filters to retrieve specific data.

• Lookup can also be used to retrieve data from related objects.

To split 1000 records into 100, divide the total number of records by the desired number of splits.

• Use a loop to iterate through the records and add them to an array or list

• Calculate the number of records per split by dividing the total number of records by the desired number of splits

• Use another loop to split the records into the desired number of splits based on the calculated number of records per split

• Ensure that a

The ternary operator can be used instead of if.

• The ternary operator is a shorthand version of if-else statement.

• Syntax: condition ? value_if_true : value_if_false

• Example: a ? map(a) : b

I would improve Google Maps by enhancing its real-time traffic updates and integrating more public transportation options.

• Improve real-time traffic updates to provide more accurate and timely information to users

• Integrate more public transportation options to provide users with more choices for getting around

• Enhance the user interface to make it more intuitive and user-friendly

• Add more detailed information about points...read more

To denounce code in jsfiddle, click on the 'Share' button and select 'Embed' to get the code.

• Click on the 'Share' button in the top menu bar.

• Select 'Embed' from the dropdown menu.

• Copy the code provided in the 'Embed' section and paste it where needed.

ConcurrentHashMap is preferred for thread-safe operations, while HashMap and Hashtable are not.

• HashMap is not thread-safe and should not be used in a multi-threaded environment.

• Hashtable is thread-safe but has poor performance due to its synchronized nature.

• ConcurrentHashMap is thread-safe and has better performance than Hashtable due to its lock-free approach.

• Use ConcurrentHashMap when multiple threads are accessing t...read more

To create a REST API, define endpoints and HTTP methods. To create a REST client, use a library or make HTTP requests.

• Define endpoints and HTTP methods for the API

• Implement the API using a framework or library

• Test the API using tools like Postman

• To create a REST client, use a library like Retrofit or make HTTP requests using a library like OkHttp

• Parse the response from the API using a library like Gson

Hashmap is a data structure that stores key-value pairs and provides fast access to values based on their keys.

• Hashmap uses a hash function to map keys to indices in an array.

• Collisions can occur when multiple keys map to the same index, which can be resolved using techniques like chaining or open addressing.

• Hashmap provides constant time complexity for insertion, deletion, and retrieval of values.

• Example: HashMapread more

To find the 3rd highest salary in SQL, we can use the 'LIMIT' and 'OFFSET' keywords.

• Use 'ORDER BY' to sort the salaries in descending order

• Use 'LIMIT 1 OFFSET 2' to select the 3rd highest salary

• Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT 1 OFFSET 2