🔑 In this reel, I’ve explained **HashMap in Java** in the simplest way 🚀

What is HashMap?

⚡ How it stores key-value pairs

🔍 Why it’s faster than other collections

💡 Real-life examples for better understanding

Master HashMap and you’ll crack a lot of Java interview questions with ease 💯

💡 Java Interview Question:

👉 How can you find leap years using the Java Stream API?

This is a popular Java interview question to test your understanding of Streams and functional programming.

Here’s the clean Java code 👇

import java.util.List;

import java.util.stream.Collectors;

public class LeapYearStream {

public static void main(String[] args) {

List years = List.of(1999, 2000, 2004, 2010, 2020, 2023);

List leapYears = years.stream()

.filter(y -> (y % 4 == 0 && y % 100 != 0) || (y % 400 == 0))

.collect(Collectors.toList());

System.out.println(leapYears);

}

}

🎯 Explanation:

Stream processes a list of years one by one

filter() applies the leap year condition

A leap year is divisible by 4 and not by 100 OR divisible by 400

collect() gathers all leap years into a list

Clean, readable, and interview-friendly

✅ Perfect for:

✔️ Java Interviews

✔️ Java 8+ Stream API Learners

✔️ Backend Developers

✔️ Java + Spring Boot Developers

👉 Save this post for Java revision

👉 Follow @ashokitschool for more Java + SQL + Full Stack content

#JavaInterviewQuestions #JavaStreams #LeapYear #StreamAPI #BackendDeveloper #JavaDeveloper #SpringBoot #AshokIT #CodingInterview #LearnJava #ProgrammingTips #JobReadySkills #FullStackDeveloper

💡 Java Interview Question:

👉 How can you find leap years using the Java Stream API?

This is a popular Java interview question to test your understanding of Streams and functional programming.

Here’s the clean Java code 👇

import java.util.List;

import java.util.stream.Collectors;

public class LeapYearStream {

public static void main(String[] args) {

List years = List.of(1999, 2000, 2004, 2010, 2020, 2023);

List leapYears = years.stream()

.filter(y -> (y % 4 == 0 && y % 100 != 0) || (y % 400 == 0))

.collect(Collectors.toList());

System.out.println(leapYears);

}

}

🎯 Explanation:

Stream processes a list of years one by one

filter() applies the leap year condition

A leap year is divisible by 4 and not by 100 OR divisible by 400

collect() gathers all leap years into a list

Clean, readable, and interview-friendly

✅ Perfect for:

✔️ Java Interviews

✔️ Java 8+ Stream API Learners

✔️ Backend Developers

✔️ Java + Spring Boot Developers

👉 Save this post for Java revision

👉 Follow @ashokitschool for more Java + SQL + Full Stack content

#JavaInterviewQuestions #JavaStreams #LeapYear #StreamAPI #BackendDeveloper #JavaDeveloper #SpringBoot #AshokIT #CodingInterview #LearnJava #ProgrammingTips #JobReadySkills #FullStackDeveloper

Here’s the clean SQL query 👇

SELECT employee_id,

employee_name,

department_id

FROM employees

WHERE department_id IN (

SELECT department_id

FROM departments

WHERE location = 'HYDERABAD'

);

🎯 Explanation:

The subquery executes first and returns a list of department_ids

The outer query filters employees whose department_id matches that list

The subquery is non-correlated (it does not depend on the outer query)

IN is used when the subquery returns multiple values

Clean and easy to read — very common in interviews

✅ Perfect for:

✔️ SQL Interviews

✔️ Backend Developers

✔️ Java + Spring Boot Learners

✔️ Data Analysts

✔️ Reporting & Business Queries

👉 Save this post for SQL revision

👉 Follow @ashokitschool for more SQL + Java + Full Stack content

#SQLInterviewQuestions #SQLTips #INOperator #SubquerySQL #NonCorrelatedSubquery #BackendDeveloper #JavaDeveloper #AshokIT #CodingInterview #LearnSQL #DatabaseConcepts #ProgrammingTips #JobReadySkills #FullStackDeveloper

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Embark on a journey to become a skilled programmer with Python! 🐍💻 Our essential tips for beginners will help you get started on the right foot.

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