Raventure Solutions Java Lead Interview Questions, Process, and Tips

Invariants in Java are conditions that must always be true at a certain point in a program's execution.

• Invariants help ensure the correctness of a program by defining conditions that should always hold true.

• They are typically used in loops, data structures, and class invariants.

• For example, in a stack data structure, an invariant could be that the stack is never empty when popping an element.

Customized collections in Java can be created by implementing the Collection interface or extending existing collection classes.

• Implement the Collection interface and provide custom implementations for methods like add, remove, contains, etc.

• Extend existing collection classes like ArrayList or LinkedList and override methods as needed.

• Consider using generics to ensure type safety and reusability of the customized colle

Code to find anagram strings in an array of strings

• Iterate through the array of strings

• Sort each string alphabetically

• Store sorted strings in a hashmap with original string as key

• Return values of hashmap as list of anagram strings

Distributed transactions in core Java involve coordinating multiple transactional resources across different systems.

• Distributed transactions involve multiple transactional resources across different systems.

• Java provides support for distributed transactions through APIs like JTA (Java Transaction API) and JTS (Java Transaction Service).

• Distributed transactions ensure ACID properties (Atomicity, Consistency, Isolation,...read more

Throttling in REST API is a technique used to limit the number of requests a client can make within a certain timeframe.

• Throttling helps prevent server overload and ensures fair usage of resources.

• Common methods of throttling include rate limiting, concurrency limiting, and request queuing.

• For example, setting a rate limit of 100 requests per minute for a specific endpoint.

• Throttling can be implemented at the API gatew