UST Software Developer 3 Interview Questions and Answers

Inheritance, abstract class, override, and interface are all concepts in object-oriented programming.

• Inheritance allows a class to inherit properties and methods from another class.

• Abstract classes cannot be instantiated and are used as a blueprint for other classes.

• Override is used to provide a new implementation for a method that is already defined in a parent class.

• Interfaces define a set of methods that a class mus...read more

Full text index is a database index that allows for efficient text-based searching.

• Full text index is used to search for specific words or phrases within a large amount of text data.

• It is commonly used in search engines, document management systems, and social media platforms.

• Full text index can be created on one or more columns of a table in a database.

• It uses techniques such as stemming, stop words, and word proximit...read more

Constructors and destructors are special methods used in object-oriented programming languages to initialize and destroy objects.

• Constructors are used to initialize objects when they are created.

• Destructors are used to clean up resources used by an object when it is destroyed.

• Constructors have the same name as the class and are called automatically when an object is created.

• Destructors have the same name as the class p...read more

PHP 7 is faster, more secure and has new features compared to PHP 5.

• PHP 7 has improved performance with up to 2x faster execution

• PHP 7 has better error handling and type declarations

• PHP 7 has new operators and functions like spaceship operator and null coalescing operator

• PHP 7 has removed deprecated features like mysql extension

• PHP 7 has improved support for Unicode

• PHP 7 requires 64-bit architecture

• PHP 7 has improved m...read more

PHP caching, session handling, and API token security

• PHP caching techniques include opcode caching, data caching, and query caching

• Session handling in PHP involves creating a unique session ID for each user and storing session data on the server

• To prevent token hijacking in APIs, use HTTPS, set expiration times for tokens, and use token revocation

• Other security measures include input validation, output encoding, and us

Store procedures, indexes, and virtual tables are important features of MySql.

• Store procedures are pre-written code blocks that can be executed on demand.

• Indexes are used to speed up database queries by creating a quick lookup table.

• Virtual tables are temporary tables that are created on the fly and do not persist in the database.

• Examples of store procedures include creating a new user or updating a record.

• Examples of ...read more

adb stands for Android Debug Bridge. It is a command-line tool used to communicate with Android devices.

• adb is used to install and debug apps on Android devices

• Some common adb commands include adb devices, adb install, and adb logcat

• adb can also be used to take screenshots, record screen videos, and access the device shell

• adb requires USB debugging to be enabled on the device

ADB is a command-line tool used to communicate with Android devices for debugging and testing purposes.

• ADB allows developers to install and uninstall apps, transfer files, and run shell commands on Android devices.

• It can be used to capture screenshots, record screen activity, and simulate device inputs.

• ADB can also be used to access the device's logcat and debug information.

• ADB is included in the Android SDK and can be...read more