40 Frequently Asked Java Interview Questions

40 Essential High-Frequency Java Interview Questions
Java Basics, Java Collections, Java Concurrency, Java Virtual Machine, Spring

5 Chapters, 40 Problems

0% Completed

Java Basics

More Java Basics Problems

hashCode and equals Methods in Java

Java Interface and Abstract Class

Shallow Copy vs Deep Copy in Java

Polymorphism in Java

Autoboxing and Unboxing in Java

Is parameter passing in Java by reference or by value?

Exception and Error in Java

Methods in Java Object Class

Immutable Class in Java

Reflection in Java

Java Annotations

Generics and Type Erasure in Java

Java Collections

More Java Collections Problems

ArrayList vs LinkedList in Java

Implementation of HashMap in Java

HashMap vs HashSet in Java

HashMap vs HashTable in Java

LinkedHashMap in Java

Why Java ConcurrentHashMap Doesn't Allow Null Keys or Values?

ConcurrentHashMap Implementation Changes in Java 8

Fail-fast and Fail-safe in Java Collections

Why do we introduce Red-Black tree in HashMap in Java 8?

Java Concurrency

More Java Concurrency Problems

volatile Keyword in Java

ExecutorPoolExecutor Parameters in Java

Prevention and Detection of Deadlocks in Java

Abort Policies in Java Thread Pool

Java Memory Model (JMM)

CAS (Compare-And-Swap) in Java

ReentrantLock in Java

When does Full GC trigger in Java?

JVM

More JVM Problems

Java Memory Areas

Four Reference Types in Java

Common Garbage Collection Algorithms in Java

Young and Old Generations in Java Garbage Collection

Direct Memory in Java

JIT (Just-In-Time) Compilation in Java

Spring

More Spring Problems

Introduction to Spring IoC Container

Cyclic Dependency in Spring

Spring Transaction Propagation Behaviors

Dependency Injection Methods in Spring

Comparison of Spring AOP and AspectJ