💡 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
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