Java Programming - MCQ Practice Questions

Java interviews and campus tests lean heavily on object oriented behaviour rather than API recall. This set covers inheritance and polymorphism, interfaces and abstract classes, the collections framework, exception handling, multithreading, string handling, and JVM basics such as garbage collection. Output based questions are included because they expose the gaps that theory questions hide.

951 questions | 100% Free

All Easy Medium Hard

All topics Basics & Syntax OOP in Java Collections Framework Multithreading Exception Handling I/O Streams JDBC Generics Lambda Expressions Spring Framework Basics

Q.21Hard

Consider this code: List<String> list = new CopyOnWriteArrayList<>(); list.add("A"); list.add("B"); Iterator<String> itr = list.iterator(); list.add("C"); System.out.println(itr.next());

Q.22Hard

In Java 2024, if you need a collection that automatically removes entries based on garbage collection patterns, which would you choose?