harishankar-github / java-interview-preparation Goto Github PK

Java Interview Preparation

Wrapper Classes

Examples

String Vs StringBuffer

String Vs StringBuffer Performance - JUnit

Basics of Object Oriented Programming

Object basics - Class, Object, State and Behavior

toString() method

EqualsHashCodeExamples

Inheritance, Method overloading and Method overriding

Interface

Abstract Class

Constructors - this() and super()

More Object Oriented Programming Concepts

Polymorphism

InstanceOf

Coupling - Problem and Solution

Cohesion - Problem and Solution

Encapsulation

Inner Class & Static Inner Class

Anonymous Class

Modifiers

Access modifiers - public, private protected and default

Final method, variable, class

Conditions and Loops

Some puzzles on conditions and loops

Operators

Increment/Decrement

InstanceOf Examples

Logical Operators

Relational Operators

String Concatenation Examples

Ternary Operators

Files

Console Examples

File Examples

Exception Handling

Exception Handling - try, catch and finallly

Checked and Unchecked Exceptions

Throwing an exception

Creating Custom Exceptions

Miscellaneus Topics

Arrays

Enum

Variable Arguments

Asserts and Garbage Collection

Static and Member initializers

Serialization

Collections

Collection Interface Hierarchy

Collection and List Interface methods and classes - ArrayList, Vector and LinkedList

Set Interfaces and Implementations - HashSet, LinkedHashSet and TreeSet

Map Interfaces and Implementations - HashMap, LinkedHashMap and TreeMap

Queue Interfaces and Implementations - Deque and BlockingQueue

Collections Code Examples

Concurrent Collections

Concurrent Collections - copyOnWriteArrayList

Compare and Swap, Locks and Atomic Operations

Generics

Multithreading

Multithreading - Need for Threads and Creating Threads

Thread states, priority, ExecutorService and Callable

Synchronization of threads, join, wait, notify and notifyAll methods

Functional Programming - Lambda Expressions and Streams

Functional Programming Examples - Streams and Lambda Expressions

Functional Programming Questions and Answers

Other Topics

Date and Calender

Regex

String and StringBuffer examples

Variables

Scope of variables

Java New Features

New Features of Java 5,6,7 and 8