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DBS Bank Interview Questions and Answers

Updated 5 Feb 2024

Q1. Write A program take the name and print the hello user name ?

Ans.

A program to take user name and print 'Hello, username'

  • Create a variable to store the user input

  • Use printf or cout to print the greeting with the user input

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Q2. What is collection and collections?

Ans.

A collection is a group of objects of the same type while collections are classes that implement data structures.

  • Collections are used to store, retrieve, manipulate, and communicate aggregate data.

  • Java.util package provides various classes for implementing collections like ArrayList, LinkedList, HashSet, etc.

  • Collections can be generic or non-generic, ordered or unordered, and allow duplicates or not.

  • Collections can be used to solve various problems like sorting, searching, fi...read more

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Q3. Difference between hash table hash map?

Ans.

Hash table and hash map are two names for the same data structure that stores key-value pairs.

  • Both use a hash function to map keys to indices in an array

  • Hash table is an older term, while hash map is more commonly used in modern programming languages

  • Java uses the term HashMap, while Python uses the term dict

  • Hash maps/tables have O(1) average case time complexity for insertion, deletion, and retrieval

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Q4. Difference between collection and collections?

Ans.

collection is an interface in Java that represents a group of objects while collections is a class that provides utility methods for collections.

  • Collection is an interface while Collections is a class

  • Collection is a part of Java Collections Framework while Collections is a utility class

  • Collection is used to represent a group of objects while Collections is used to provide utility methods for collections

  • Example of Collection: List, Set, Queue, etc.

  • Example of Collections: sort(...read more

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Q5. Connection of database program ?

Ans.

Database program can be connected using various methods such as JDBC, ODBC, ORM, etc.

  • JDBC is a Java API for connecting to databases

  • ODBC is a standard API for connecting to databases

  • ORM frameworks like Hibernate can be used to connect to databases

  • Connection string is used to specify the database connection details

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Q6. Difference between Set And vector?

Ans.

Set is an unordered collection of unique elements while vector is an ordered collection of elements.

  • Set does not allow duplicates while vector can have duplicates.

  • Set is implemented using hash table while vector is implemented using dynamic array.

  • Set has faster lookup time while vector has faster iteration time.

  • Set is useful when uniqueness is important while vector is useful when order is important.

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