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Java concepts and notes with hundreds of practice questions.

Java Interview Course is written based on the experience of many professional Software Architects who have conducted hundreds of technical interviews for their organization.

Java Interview Course covers most of the Java concepts that applicants are expected to have hands-on experience and must have thorough conceptual understating. This book also includes lots of snippets of code and figures to explain the concepts.

A clear understanding of the principles of software design and language is important as the same questions can be discussed during an interview in several different ways.

Interviewers are interested not only in hearing the correct response but also in your opinion and thoughts on the issue. Your approach towards interpreting the questions and articulating your thoughts plays a crucial role in your success.

To build the courage to face such an interview, you need to spend a decent deal of coding, reading technical topics, and talking to peers about it.

I hope this book helps you plan not just for your next interview but also for your daily task of developing software.

Concepts covered

Java Program Anatomy

Java Program and JVM

Data Types

Naming Convention

Object class

Access Modifiers

static

final

static initialization block

finally

finalize

Widening vs Narrowing Conversion

getters and setters

varargs vs object array

default interface method

static interface method

Annotations

Preferences

Pass by value or reference

Polymorphism

Overriding

Overloading

Abstraction

Inheritance

Composition

Fundamental Design Concepts

DI vs IoC

Service Locator

Diamond Problem

Programming to Interface

Abstract class vs Interface

Internationalization and Localization

Immutable Objects

Cloning

Data Types

NaN

EnumSet

Comparing Data Types

enum vs public static int field

Wrapper Classes

Auto-boxing and Auto-unboxing

BigInteger and BigDecimal

Strings

String Literal vs Object

String Interning

String Pool Memory Management

Immutability

Circumvent String immutability

StringBuffer vs StringBuilder

Unicode

Inner Classes

Static Member Nested Class

Local Inner Class

Non-Static Nested Class

Anonymous Inner Class

Functional Programming

Lambda Expression

Functional Interface

Pure Functions

Fluent Interface

Generics-Type Wildcards

Generics - Method

Java Generics vs Java Array

Generics - Type Erasure

Co-variance

Contra-variance

Co-variance vs Contra-variance

Collections

Collection design aspects

Collection Interfaces

Collection Types

Set

List

Queue

Map

Algorithms

Comparable vs Comparator

hashCode and equals

HashTable vs HashMap

Synchronized vs Concurrent Collections

Iterating over collections

fail-fast vs fail-safe

Error and Exception

Checked vs Unchecked vs Error

Exception Handling Best Practices

try-with-resource

Threading Terms

Thread Lifecycle

Thread Teation

Runnable vs Thread

Runnable vs Callable

Daemon Thread

Race Condition and Immutable object

Thread Pool

Synchronization

Concurrent vs Parallel vs Asynchronous

Thread Synchronization

Synchronized method vs Synchronized block

Conditional Synchronization

Volatile

static vs volatile vs synchronized

ThreadLocal Storage

wait vs sleep

Joining Thread

Atomic Classes

Lock

ReadWriteLock

Synchronizers

Barrier

Semaphore

Phaser

Exchanger

Latch

Executor Framework

Fork-Join Framework

Reflection

Purpose of reflection

Drawbacks of Reflection

JSON

Memory Management

Stack vs Heap

Heap fragmentation

Object Serialization

Garbage Collection

Memory Management

Weak vs Soft vs Phantom Reference

Unit vs Integration vs Regression vs Validation

Testing private members

Mocking and Mock Objects

Java Tools



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