Intercat Hospitality Interview Questions and Answers

Deadlock in multithreading occurs when two or more threads are waiting for each other to release resources, causing them to be stuck indefinitely.

• Deadlock can be prevented by using proper synchronization techniques like avoiding nested locks, using timeouts, and implementing a deadlock detection algorithm.

• One common example of deadlock is the dining philosophers problem, where multiple philosophers are sitting at a table with chopsticks and can only eat if they have both chop...read more

Ways of creating threads include extending the Thread class, implementing the Runnable interface, and using Executor framework.

• Extending the Thread class: Create a new class that extends the Thread class and override the run() method.

• Implementing the Runnable interface: Create a class that implements the Runnable interface and implement the run() method.

• Using Executor framework: Create a thread pool using Executor framework and submit tasks to it for execution.

Primary goals are main objectives to be achieved, while secondary goals are additional objectives that support the primary goals.

• Primary goals are the main objectives that an individual or organization aims to achieve.

• Secondary goals are additional objectives that support the primary goals.

• Primary goals are usually more critical and have higher priority than secondary goals.

• Examples: Primary goal of a company may be to increase revenue, while a secondary goal may be to improv...read more

OOP stands for Object-Oriented Programming, a programming paradigm based on the concept of objects.

• OOP focuses on creating objects that contain data and methods to manipulate that data.

• Key concepts include encapsulation, inheritance, and polymorphism.

• Encapsulation involves bundling data and methods that operate on the data into a single unit.

• Inheritance allows classes to inherit attributes and methods from other classes.

• Polymorphism allows objects to be treated as instances o...read more

JDBC (Java Database Connectivity) is a Java API that allows Java programs to interact with databases.

• JDBC uses a driver manager to load the appropriate driver for the specific database being accessed.

• It establishes a connection to the database using the DriverManager class.

• SQL queries are executed using Statement, PreparedStatement, or CallableStatement objects.

• ResultSets are used to retrieve data from the database.

• Transactions can be managed using Connection objects.

HashSet is an unordered collection while LinkedHashSet maintains insertion order.

• HashSet does not maintain insertion order, LinkedHashSet maintains insertion order.

• HashSet does not allow duplicate elements, LinkedHashSet allows duplicate elements.

• HashSet uses hashing mechanism to store elements, LinkedHashSet uses a doubly linked list to maintain order.

Wrapper class is a class that wraps around a primitive data type and provides additional methods and functionalities.

• Wrapper classes in Java are used to convert primitive data types into objects.

• They provide methods to perform various operations on the data, such as conversion, comparison, and manipulation.

• Examples of wrapper classes in Java include Integer, Double, Boolean, etc.

Servlet and JSP have different life cycles. Servlet is initialized, service method is called, and then destroyed. JSP is translated to servlet, initialized, service method is called, and then destroyed.

• Servlet life cycle: Initialization, service method invocation, destruction.

• JSP life cycle: Translation to servlet, initialization, service method invocation, destruction.