1000+ Interview Questions and Answers

Java interview questions covering topics like abstraction, inheritance, garbage collector, class loader, Spring security, bean scopes, wait-notify, class vs object level local, ArrayList vs LinkedList, Singleton class, and RestController vs Controller.

• Abstraction focuses on hiding implementation details while inheritance allows a class to inherit properties and methods from another class.

• Garbage collector is a program that automatically frees up memory by deleting objects tha...read more

Reverse a string and replace vowels with numbers in descending order. Restart numbering if more than 9 vowels.

• Reverse the given string using built-in functions or loops

• Create a dictionary to map vowels to numbers from 1-9

• Iterate through the reversed string and replace vowels with numbers from the dictionary

• If there are more than 9 vowels, restart numbering from 1

• Sort the replaced numbers in descending order from left to right

COMP and COMP-3 are data types used in COBOL programming language.

• COMP is a binary data type that stores numeric values as binary integers.

• COMP-3 is a packed decimal data type that stores numeric values as packed decimal digits.

• COMP uses less storage space compared to COMP-3.

• COMP-3 is more suitable for decimal arithmetic operations.

• COMP-3 values are stored in a packed format, where each digit occupies half a byte.

• COMP-3 values can represent both positive and negative numbers.

To check all connected ports and power supply, use commands like lsusb, lspci, lshw, and check power cables and system configuration.

• Use lsusb command to list USB devices connected to the computer

• Use lspci command to list PCI devices connected to the computer

• Use lshw command to list detailed hardware information

• Physically check power cables and connections

• Verify system configuration settings

To eliminate duplicates from 2 files and send them to another output file, we can use a combination of file reading, hashing, and file writing.

• Read the contents of both files and store them in separate arrays or lists.

• Create a hash table or dictionary to keep track of the unique elements in the arrays.

• Iterate through the arrays and add each element to the hash table. If the element already exists, skip it.

• Write the contents of the hash table to the output file.

• If needed, writ...read more

Ansible playbooks automate configuration management. CI/CD pipeline automates software delivery. Tools include Jenkins, GitLab, and Travis CI.

• Ansible playbooks are written in YAML format and define tasks to be executed on remote hosts.

• CI/CD pipeline automates the software delivery process from code commit to production deployment.

• Tools for pipeline creation include Jenkins, GitLab, Travis CI, and CircleCI.

• Pipeline creation involves defining stages, jobs, and triggers to autom...read more

The details to share with the supplier for a quote

• Product specifications

• Quantity required

• Delivery timeline

• Quality standards

• Payment terms

• Any specific packaging or labeling requirements

• Any applicable certifications or regulatory compliance

• Expected pricing or budget constraints

Ariba is a procurement tool that offers a comprehensive suite of solutions for procurement processes.

• Ariba provides end-to-end procurement solutions, including sourcing, contract management, supplier management, and procurement analytics.

• It offers a cloud-based platform that allows for easy collaboration between buyers and suppliers.

• Ariba's network connects millions of buyers and suppliers globally, enabling efficient procurement processes.

• The tool provides real-time visibili...read more

Inheritance is a mechanism in object-oriented programming where a new class is derived from an existing class.

• It allows the new class to inherit the properties and methods of the existing class.

• There are two types of inheritance: single and multiple.

• Single inheritance is when a class inherits from only one parent class.

• Multiple inheritance is when a class inherits from multiple parent classes.

• For example, a class 'Car' can inherit from a parent class 'Vehicle' which has prope...read more

DITA XML is a structured content standard used for creating technical documentation.

• DITA XML is a structured content standard for technical documentation

• Commonly used tags include ,