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Java Lead Interview Questions and Answers

Updated 26 Sep 2024

Q1. How will creat Customized collection in java

Ans.

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 collection.

Q2. Write code to find anagram strings

Ans.

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

Q3. Distributed transaction in core java

Ans.

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, Durability) across multiple resources.
Example: Using JTA ...read more

Q4. Throttling in rest api

Ans.

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 gateway level or within the application code.

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Q5. explain about java 8 feature

Ans.

Java 8 introduced several new features including lambda expressions, streams, functional interfaces, and default methods.

Lambda expressions allow you to write more concise code by providing a way to pass functions as arguments.
Streams provide a new way to work with collections in a functional style, allowing for easier parallel processing.
Functional interfaces are interfaces with a single abstract method, which can be implemented using lambda expressions.
Default methods allow...read more

Q6. Explain SOLID principles

Ans.

SOLID principles are a set of five design principles in object-oriented programming to make software designs more understandable, flexible, and maintainable.

Single Responsibility Principle (SRP) - A class should have only one reason to change.
Open/Closed Principle (OCP) - Software entities should be open for extension but closed for modification.
Liskov Substitution Principle (LSP) - Objects of a superclass should be replaceable with objects of its subclasses without affecting...read more

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Q7. Invariant in java

Ans.

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.