Java Programming Handbook

Use the Java Programming Handbook to quickly learn core Java concepts

Java

Java Programming

Java Programming Handbook

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Handbook Content

Handbook Chapters

Follow our structured learning path. Explore all the chapters and in-depth topics covered in this handbook.

Java Tutorial – A Comprehensive Guide for Beginners

Learn Java from scratch with this beginner-friendly tutorial covering everything from Java fundamentals to advanced concepts like collections, exceptions, and lambda expressions. Perfect for aspiring Java developers and students preparing for interviews.

Java Beginners Guide

Java Programming

Introduction to Java

This blog introduces the fundamentals of Java programming, offering a clear explanation of key concepts, its history, and practical coding examples. It covers everything from writing your first "Hello, World!" program to tips on learning Java effectively, making it a comprehensive guide for beginners.

Introduction to Java

Installing JDK on your machine

This blog explains how to download, install, and set up the Java Development Kit (JDK) on your computer step-by-step. It also guides you through writing, compiling, and executing your very first Java program using Notepad and Command Prompt.

Introduction to Java

Java Comments

This blog explains the types of comments in Java with simple examples and highlights why adding comments is crucial for better code readability and collaboration. It covers both single-line and multi-line comments used in real Java programs.

Introduction to Java

Java Variables and Literals

This blog explains Java variables and literals with easy-to-understand examples, covering their types, usage, and rules for declaring variables. It also highlights best practices and syntax to help you write clean and error-free Java code.

Java Fundamentals

Data Types in Java

This blog covers all data types in Java, including primitive types like int, float, and boolean, and non-primitive types like String and arrays. It explains each type with simple examples to help you choose the right data type for your variables.

Java Fundamentals

Java Data Types

Operators in Java

This blog explains all types of operators in Java, including arithmetic, relational, logical, bitwise, assignment, unary, ternary, and instanceof operators. It includes easy-to-follow examples and outputs to help you understand how each operator works in real code.

Java Fundamentals

Java Basic Input and Output

This blog covers the fundamentals of Java Input and Output operations, including reading user input using the Scanner class and printing output with System.out.println() and printf(). It includes beginner-friendly examples for reading different data types and formatting output for clear understanding.

Java Fundamentals

Java Expressions, Statements and Blocks

This blog explains the core concepts of Java expressions, statements, and blocks with beginner-friendly examples. It covers different types of expressions, how statements work in Java, and how blocks help structure your code. Perfect for understanding the building blocks of Java programming.

Java Fundamentals

Java Expressions

Java Statements

Java if else statement

This blog explains the Java if-else statement with clear syntax, flow of execution, and practical examples. It covers basic, else-if, nested conditions, and the use of logical operators to help you write effective decision-making logic in Java.

Java flow control

Java if else statement

Java Ternary Operator

This blog explains the Java Ternary Operator in detail with simple syntax, real-world examples, and use cases. Learn how to use it for value assignment, conditional logic, and method returns — all while keeping your code concise and readable.

Java flow control

Java Ternary Operator

Java For Loop

This blog covers everything you need to know about Java for loops, including syntax, usage, and practical examples like counting, array iteration, and enhanced for-each loops to help you write efficient and clean code.

Java flow control

Java while and do while loop

This blog explains Java's while and do-while loops with clear syntax, real-world examples, and key differences between the two. Learn how each loop works, when to use them, and how they behave in infinite loop scenarios.

Java flow control

Java while loop

java do-while loop

Java continue and break statement

This blog covers the usage of continue and break statements in Java with clear explanations, syntax, and practical examples using for, while, and nested loops. Learn how these control flow statements help in skipping iterations or exiting loops efficiently.

Java flow control

Java continue and break statement

Java Switch Statement

This blog covers everything you need to know about the switch statement in Java, including syntax, working, real-world examples, rules, and the enhanced switch introduced in Java 12+. It helps you write cleaner and more efficient conditional logic using switch.

Java Flow Controls

Java switch statement

Java Arrays

This blog covers everything you need to know about Java Arrays, including how to declare, initialize, access, and loop through arrays with examples. It also explains array limitations and includes beginner-friendly programs to help you understand the concept better.

Java Multidimensional Arrays

This blog covers everything you need to know about Java multidimensional arrays, including how to declare, initialize, and access elements using loops. It also features example programs, jagged arrays, and key limitations to help you understand them better.

Java Multidimensional Array

Java Copy Arrays

This blog covers all the essential ways to copy arrays in Java, including using loops, System.arraycopy(), clone(), Arrays.copyOf(), and Arrays.copyOfRange() with clear examples and expected outputs. Learn when and why to use each method effectively.

Methods in Java

This blog covers everything you need to know about writing methods in Java, including how to declare, call, and use methods with parameters and return types. Packed with beginner-friendly examples, it helps you write cleaner, reusable, and efficient Java code.

Parameter Passing in Java

This blog explains how parameter passing works in Java, covering both primitive data types and reference types like objects and arrays. It includes clear examples, expected outputs, and key differences between pass-by-value and pass-by-reference to help you understand how Java handles method arguments.

Parameter Passing in Java

Method Overloading in Java

This blog explains everything about Method Overloading in Java, covering its rules, benefits, real-world examples, and common mistakes. It also includes constructor overloading with clear code samples to help you master compile-time polymorphism.

Method Overloading

Variable Arguments (varargs) in Java

This blog covers everything about Variable Arguments (varargs) in Java, including syntax, real-life examples, usage with other parameters, and key limitations. Learn how varargs simplify method definitions and reduce the need for overloading.

Variable arguments

Java CommandLine Arguments

This blog explains how to use command-line arguments in Java, covering how to pass, access, convert, and validate them with practical examples. It also includes tips for handling invalid input and making your programs more dynamic and user-friendly.

Command Line Arguments

Java Recursive Method

This blog covers everything you need to know about recursive methods in Java, including how they work, when to use them, and real-world examples like factorial, Fibonacci series, and number printing. It also compares recursion with iteration and highlights the pros and cons for better decision-making.

Java Recursive methods

Principles of Object-Oriented Programming

This blog explains the core principles of Object-Oriented Programming (OOP) in Java—Encapsulation, Abstraction, Inheritance, and Polymorphism—using simple real-world examples. It also introduces the concepts of classes and objects to help you build a solid foundation for writing clean, reusable, and maintainable Java code.

Java Classes and Objects

Java Class and Objects

This blog explains the core concepts of classes and objects in Java with real-world analogies and code examples. It covers how classes act as blueprints and how objects bring them to life in memory, forming the foundation of Java’s Object-Oriented Programming.

Java Constructor

This blog covers everything about constructors in Java, including default, parameterized, and copy constructors with practical examples. It also explains constructor overloading, helping you understand how Java initializes objects efficiently.

Java Constructor

Encapsulation in Java

This blog explains the concept of Encapsulation in Java, highlighting its importance in data security and code maintainability. It includes real-world examples, benefits, and a step-by-step guide on how to implement encapsulation using private fields and public methods.

Java Encapsulation

What is Inheritance in java

This blog explains Inheritance in Java, covering its types—single, multilevel, hierarchical, and hybrid—with clear examples and use cases. It also highlights why Java doesn't support multiple inheritance through classes and how interfaces help overcome that limitation.

Java Inheritance

Constructors in Inheritance

This blog explains how constructors work in inheritance in Java, covering topics like default and parameterized constructors, the use of super(), and constructor chaining with practical examples. It helps you understand the order of constructor execution in an inheritance hierarchy.

Java Constructors in Inheritance

this Vs super Keyword

This blog explains the difference between this and super keywords in Java with clear examples and practical use cases. It covers how both keywords are used for accessing variables, constructors, and methods within the same class or from a parent class.

Method Overriding in Java

This blog covers everything you need to know about Method Overriding in Java, including its rules, importance in achieving runtime polymorphism, and practical examples with the use of the super keyword. It also highlights key concepts useful for interviews and real-world Java development.

Method Overriding

Dynamic Method Dispatch

This blog explains the concept of Dynamic Method Dispatch in Java, showcasing how runtime polymorphism works through method overriding. It includes clear examples and real-world use cases to help you understand how Java decides which method to call at runtime, enhancing flexibility and maintainability in your code.

Dynamic Method Dispatch

Polymorphism using Overloading and Overriding in Java

This blog explains Polymorphism in Java using both Method Overloading (compile-time) and Method Overriding (runtime) with practical examples and key differences. It covers how these two mechanisms work together to enable flexible and dynamic behavior in Java applications.

Java Polymorphism

Runtime Polymorphism

Compiletime Polymorphism

Abstract Class in Java

This blog covers everything you need to know about Abstract Classes in Java, including real-world examples, key features, do’s and don’ts. It simplifies the concept with beginner-friendly explanations to strengthen your understanding of object-oriented programming.

Java Abstract Classes

Interfaces in Java

This blog explains what interfaces are in Java, how to define and implement them, and how they enable abstraction and multiple inheritance. It also covers default and static methods in interfaces with examples, along with essential do’s and don’ts to follow and also provides clear difference between Abstract Classes and Interfaces.

Java Interfaces

Inner Classes in Java

This blog explores Inner Classes in Java, covering their purpose, benefits, and all four types—Member, Static Nested, Local, and Anonymous Inner Classes—with practical examples.

Inner Classes in Java

Static Members and Static Blocks in Java

This blog explains static members and static blocks in Java with simple examples, highlighting their characteristics, differences from instance members, and real-world use cases. Learn how and when to use static variables, methods, and blocks effectively in your Java programs.

Java Static Members

Java Static Blocks

Final Members in Java

This blog covers everything you need to know about final members in Java, including final variables, methods, and classes, with simple examples and key use cases. Learn how the final keyword enhances code security, immutability, and stability in Java applications.

Java Final Members

Singleton Class in Java

This blog explains the Singleton class in Java with a simple implementation using static and final keywords. Learn how the Singleton pattern ensures a single instance and when to use it for shared resources like configuration or database connections.

Java Final Members

Singleton Class

Exceptions in Java

This blog explains what exceptions are in Java, why they occur, and the difference between compile-time and runtime errors. It also highlights the importance of exception handling in building robust and error-free applications.

Java Exceptions

Java Exception Handling

How to Handle Exception in Java

This blog covers how to handle exceptions in Java using try-catch blocks, the finally block, throw and throws keywords, along with best practices. It explains each concept with simple examples to help you write robust and error-handled Java programs.

Java Exceptions

Java Exception Handling

Try and Catch Block

This blog explains how try and catch blocks work in Java, including their syntax, internal flow, and real-world examples. It also covers handling multiple exceptions and best practices for writing clean and effective exception handling code.

Java Exceptions

Java Exception Handling

try-catch block

Multiple and Nested Try Catch

This blog explains how to use multiple and nested try-catch blocks in Java with clear examples. It covers their structure, key differences, real-world use cases, and best practices for writing robust exception-handling code.

Java Exception Handling

try-catch block

Multiple and nested try-catch blocks

Class Exception

This blog explains the Exception class in Java, covering its hierarchy, key methods, and how to create custom exceptions. It also includes practical examples and best practices for effective exception handling.

Java Exceptions

Exception Class

Checked vs Unchecked Exceptions in Java: Ultimate Guide

This blog explains the key differences between checked and unchecked exceptions in Java with examples, handling techniques, and best practices. It helps you understand when and how to use each type of exception effectively.

Java Exceptions

Checked Exceptions

Unchecked Exceptions

Throw vs Throws

This blog explains the key differences between throw and throws in Java, with clear syntax, practical examples, and best practices for handling exceptions effectively. It helps you understand when and how to use each keyword in java applications.

Java Exceptions

Throw Vs Throws

Finally Block

This blog covers everything about the finally block in Java, including its purpose, usage with try-catch, behavior with return statements, and edge cases where it doesn’t execute. Learn through practical examples and best practices for effective exception handling.

Java Exceptions

Try with Resources

This blog explains how Java's Try-with-Resources simplifies resource management by automatically closing resources like files and database connections. It includes examples, syntax, and best practices that help write cleaner and safer code.

Java Exceptions

Try with resources

Introduction to Generics

This blog explains what Generics are in Java and how they improve type safety, reusability, and eliminate the need for type casting. It covers the advantages of using Generics, basic syntax, and includes easy-to-understand code examples for better clarity.

Defining Generic Class

This blog explains how to define and use generic classes in Java, covering syntax, single and multiple type parameters, and wildcard usage. It includes practical examples to help you write flexible, reusable, and type-safe code using Generics.

Generic Classes

Bounds on Generics

This blog explains how to use bounds in Java Generics with clear examples, including upper bounds (extends) and lower bounds (super). It covers when and why to use bounded type parameters to ensure type safety and flexibility in your code.

Generic Classes

Bounds on Generics

Java Generic Methods

This blog explores Generic Methods in Java with detailed examples, covering their syntax, use of multiple type parameters, bounds (extends, super), and wildcards. It also compares generic methods with generic classes and highlights practical use cases for real-world development.

Generic Methods

Introduction to Lambda Expressions

This blog introduces Lambda Expressions in Java, explaining their syntax, benefits, and how they simplify code using functional interfaces. It includes practical examples comparing traditional anonymous classes with lambdas and highlights their role in functional programming.

Java Lambda expressions

Parameters in Lambda Expression

This blog dives deep into parameters in lambda expressions in Java, covering syntax rules, type inference, return values, and real-world examples. It also highlights common mistakes and best practices to help you write clean and efficient functional code.

Java Lambda expressions

Parameters in Lambda expression

Capture in Lambda Expressions

This blog dives deep into how variable capture works in Java lambda expressions, explaining local, instance, and static variable capture with clear examples. Learn common mistakes, best practices, and how to write efficient, bug-free lambda-based code with ease.

Java Lambda expressions

Capture in Lambda Expression

Method References in Java

This blog explains Java Method References in detail, covering all four types—static method, instance method, arbitrary object, and constructor references. It includes practical examples and comparisons with lambda expressions to help you write cleaner and more readable functional code.

Java Lambda expressions

Method References

Collections in Java

This blog provides a complete overview of Collections in Java, explaining their need, key features, and how they overcome the limitations of arrays. It covers the Java Collection Framework hierarchy, essential interfaces like List, Set, Queue, and Map, and includes practical examples using the Collection interface.

Java Collections

Understanding Collection Interface

This blog offers a detailed explanation of the Collection interface in Java, covering its core methods like add, remove, contains, size, and iteration with practical examples. It highlights the role of Collection as the foundation for List, Set, and Queue, helping you understand how to use it effectively in real-world scenarios.

Java Collections

Collection Interface

Understanding List Interface in Java

This blog explains the Java List interface in detail, covering its key features, commonly used methods, and real-world examples. It also compares major implementations like ArrayList, LinkedList, Vector, and Stack to help you choose the right one for your needs.

Java Collections

Java ArrayList

This blog provides a comprehensive guide to Java's ArrayList class, covering its internal working, constructors, commonly used methods with examples, performance insights, thread safety considerations, and best practices. Whether you're learning or revising, this blog equips you with everything you need to master ArrayList in Java.

Java Collections

Java LinkedList

This blog provides a comprehensive overview of Java's LinkedList class, covering its internal working, constructors, commonly used methods with examples, performance, and best practices. Whether you're looking to understand how LinkedList works or explore its real-world use cases, this blog has everything you need in one place.

Java Collections

Java LinkedList

Java Vector

This blog offers a complete guide to the Vector class in Java, a thread-safe dynamic array implementation from the Java Collection Framework. It covers its characteristics, constructors, commonly used methods, and usage examples—making it easy to understand when and how to use Vector effectively in your Java applications.

Java Collections

Java Stack

This blog offers a complete guide to the Stack class in Java, covering its internal working, key methods like push(), pop(), and peek(), real-world use cases, and comparison with other list implementations. Whether you're learning data structures or preparing for interviews, this blog provides detailed examples and insights to master Java Stack.

Java Collections

Understanding Queue Interface in Java

This blog provides a comprehensive guide to the Queue interface in Java, covering its FIFO behavior, key methods, and popular implementations like PriorityQueue, ArrayDeque, and LinkedList. With detailed examples and comparison tables, this blog helps you understand how and when to use each Queue type effectively.

Java Collections

Java Queue Interface

Java PriorityQueue

This blog provides a complete guide to Java's PriorityQueue, covering its characteristics, constructors, commonly used methods with examples, performance, limitations, and use cases. Learn how to implement both Min Heap and Max Heap using custom comparators.

Java Collections

Java Priority Queue

Java ArrayDeque

This blog provides a complete guide to Java's ArrayDeque, covering its key features, constructors, commonly used methods with examples, internal working, performance, and real-world use cases. Learn how to efficiently use ArrayDeque for stack and queue operations in your Java applications.

Java Collections

Java ArrayDeque

Understanding Set Interface in Java

This blog explains the Java Set interface, its key methods, and its major implementations including HashSet, LinkedHashSet, TreeSet, and SortedSet. Learn how each type handles ordering, duplicates, and performance to choose the right one for your use case.

Java Collections

Java Set Interface

Java HashSet

This blog covers the HashSet class in Java, explaining its key features, constructors, commonly used methods, performance characteristics, and practical examples. Learn how HashSet ensures uniqueness and delivers fast operations using its internal hash-based structure.

Java Collections

Java Set Interface

Java LinkedHashSet

This blog explains the LinkedHashSet class in Java, highlighting its key features, constructors, and methods with code examples. Learn how it maintains insertion order while ensuring element uniqueness, making it ideal for ordered, duplicate-free collections.

Java Collections

Java Set Interface

Java LinkedHashSet

Java TreeSet

This blog offers a comprehensive guide to Java's TreeSet, covering its features, constructors, methods, performance, and usage examples. It also explains how TreeSet maintains sorted unique elements using a Red-Black Tree and demonstrates custom sorting with comparators.

Java Collections

Java Set Interface

Understanding Map Interface in Java

This blog provides a comprehensive overview of the Map interface in Java, covering its key features, methods, and popular implementations like HashMap, LinkedHashMap, TreeMap, and Hashtable. It highlights their differences, use-cases, and performance to help you choose the right one for your needs.

Java Collections

Java Map Interface

Java HashMap

This blog provides a complete guide to HashMap in Java, covering its key features, commonly used methods with examples, internal working, and performance details. Learn how HashMap stores key-value pairs, handles collisions, and when to use it effectively in your Java applications.

Java Collections

Java Map Interface

Java LinkedHashMap

This blog explains the LinkedHashMap class in Java, covering its internal working, key features, important methods with examples, performance insights, and ideal use cases. Learn how it maintains insertion order and when to prefer it over HashMap.

Java Collections

Java Map Interface

Java LinkedHashMap

Java TreeMap

This blog provides a comprehensive guide to TreeMap in Java, covering its implementation detail, key features, performance, and use cases. It includes practical examples, method explanations, and insights into how TreeMap maintains sorted key order for efficient data access.

Java Collections

Java Map Interface

Comparable Interface in Java

This blog explains the Comparable interface in Java with simple examples, showcasing how to sort custom objects using natural ordering. Learn how to implement compareTo(), handle different sorting scenarios like ascending, descending, and sorting by name, and understand when to use Comparable vs Comparator.

Java Collections

Java Comparable Interface

Comparator Interface in Java

This blog covers the Comparator interface in Java with examples, showing how to implement custom and multi-level sorting logic. Learn how to sort objects by different criteria using traditional classes and modern lambda expressions.

Java Collections

Java Comparator Interface

What are Streams

This blog explains Java I/O Streams with clear examples, covering how data flows using byte and character streams. Learn the basics of stream types, when to use them, and how they simplify input and output operations in Java.

Java I/O Streams

InputStream and OutputStream Classes

This blog explains Java's InputStream and OutputStream classes, highlighting their core methods and listing key subclasses like FileInputStream and BufferedOutputStream. Learn how these byte-based streams enable efficient reading and writing of data in Java applications.

Java I/O Streams

Java InputStream

Java OutputStream

FileInputStream and FileOutputStream

This blog covers Java's FileInputStream and FileOutputStream classes, explaining how to read from and write to files using byte streams. It includes practical examples, key methods, and guidance on when to use these classes for efficient file handling.

Java I/O Streams

Java FileInputStream

Java FileOutputStream

ByteArrayInputStream and ByteArrayOutputStream

This blog explains Java's ByteArrayInputStream and ByteArrayOutputStream classes with detailed examples, outputs, and key methods. It highlights how to handle byte data in memory for tasks like testing, data conversion, and stream manipulation.

Java I/O Streams

Java ByteArrayInputStream

Java ByteArrayOutputStream

ObjectInputStream and ObjectOutputStream

This blog explains how to use Java’s ObjectInputStream and ObjectOutputStream classes for object serialization and deserialization with clear examples. It covers essential methods, use cases, and key considerations for persisting and transferring objects efficiently.

Java I/O Streams

Java ObjectInputStream

Java ObjectOutputStream

BufferedInputStream and BufferedOutputStream

This blog covers how Java’s BufferedInputStream and BufferedOutputStream classes enhance file I/O performance with buffering. It includes detailed method explanations and examples to demonstrate efficient reading and writing of data.

Java I/O Streams

Java BufferedInputStream

Java BufferedOutputStream

Java PrintStream Class

This blog explains Java’s PrintStream class, highlighting how to use its key methods like print, println, printf, and write with real-world examples. It also covers how PrintStream simplifies writing formatted, human-readable output to files and the console.

Java I/O Streams

Java PrintStream Class

Java File Class

This blog covers the Java File class in detail, explaining its constructors, key methods like createNewFile(), delete(), exists(), and how to manage files and directories with examples. It’s a complete guide to interacting with the file system in Java.

Java File Class

Java Reader and Writer Class

This blog explores Java's Reader and Writer classes in depth, covering essential methods like read(), write(), flush(), and close() with practical examples and outputs. It also includes a clear class hierarchy diagram and explains when to use character-based I/O over byte streams. Perfect for mastering Java’s text-based input and output system.

InputStreamReader and OutputStreamWriter Class

This blog explains the InputStreamReader and OutputStreamWriter classes in Java with detailed examples, showcasing how they bridge byte streams and character streams. It covers constructors, key methods like read(), write(), flush(), and close(), along with practical code snippets for better understanding.

InputStreamReader Class

OutputStreamWriter Class

FileReader and FileWriter Class

This blog covers the essential concepts of Java's FileReader and FileWriter classes with clear explanations, class hierarchies, constructors, and method-wise code examples. Learn how to read and write character-based files effectively in Java using real-world use cases.

FileReader Class

FileWriter Class

BufferedReader and BufferedWriter Class

This blog covers the efficient use of BufferedReader and BufferedWriter in Java for reading and writing text data. It explores the key methods, such as readLine(), write(), newLine(), and how internal buffering enhances performance. Practical examples demonstrate how to handle file I/O tasks efficiently with these classes.

BufferedReader Class

BufferedWriter Class

Java StringReader and StringWriter Classes

This blog explains the usage of Java's StringReader and StringWriter classes, which are part of the java.io package. It covers how these classes allow you to perform in-memory reading and writing operations on strings, simulating file I/O without accessing the filesystem. Detailed examples demonstrate how to efficiently read from and write to strings using these classes.

StringReader Class

StringWriter Class

Java PrintWriter Class

This blog covers the Java PrintWriter class, a powerful tool for writing formatted text to various output destinations such as files, memory buffers, and network streams. It explores key features like automatic flushing, formatted output, and the differences between PrintWriter and PrintStream, along with practical examples to help you get started.

Java PrintWriter Class

Java Fundamentals Interview Questions

Prepare for Java interviews with these top 20 Java Fundamentals questions, complete with examples and detailed answers. Ideal for beginners and job seekers aiming to master variables, data types, operators, and more.

Java Interview Questions

Java Fundmentals Interview Questions

Java Flow Control Interview Questions

Boost your Java interview prep with 25 top Java flow control questions and answers covering if-else, loops, switch, and ternary. Ideal for beginners and job seekers in 2025!

Java Interview Questions

Java Flow Control Interview Questions

Java Arrays Interview Questions

Master Java Arrays with 20+ top interview questions covering single & multidimensional arrays, jagged arrays, and array copying—complete with detailed explanations and code examples. Perfect for beginners & job seekers prepping for Java interviews in 2025!

Java Interview Questions

Java Arrays Interview Questions

Java Methods Interview Questions

Master Java Methods with 25 top interview questions and detailed answers. Learn method overloading, recursion, varargs, and more with real-world code examples. Perfect for Java beginners and interview prep.

Java Interview Questions

Java Methods Interview Questions

Java Object Oriented Programming Interview Questions

Master Java Object-Oriented Programming (OOP) interview questions with clear explanations, real-world code examples, and practical tips. Perfect guide for beginners and job seekers preparing for Java interviews.

Java Interview Questions

Java OOPs Interview Questions

Java Inner Classes Interview Questions

Master Java Inner Classes with 20 essential interview questions and detailed explanations! Boost your Java skills, understand member, static, local, and anonymous classes, and ace your next coding interview confidently.

Java Interview Questions

Java Inner Classes Interview Questions