Core Java Developers Guide

Java Basics

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• Variables in Java
• Java main() Method
• Java Access Modifiers
• Arithmetic Operators
• Bitwise Operators
• Equality, Relational, and Conditional Operators
• Primitive Data Types in Java
• Java if Statement
• Java Switch Case Statement
• Java for Loop
• Java while Loop
• Java do-while Loop
• Java continue Statement
• Java break Statement

Wrapper Classes Guide

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Wrapper Classes Basics

• Wrapper Classes in Java
• Autoboxing and Unboxing in Java

Wrapper Classes API Guide

1. Integer Wrapper Class in Java
2. Long Wrapper Class in Java
3. Float Wrapper Class in Java
4. Double Wrapper Class in Java
5. Boolean Wrapper Class in Java
6. Short Wrapper Class in Java
7. Byte Wrapper Class in Java
8. Character Wrapper Class in Java

Java Arrays Guide

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1. Java Array Basics Guide

• Array Overview
• Advantage of Java Array
• Disadvantage of Java Array
• Types of Array in java
• Array Simple Example
• Declaring an Array
• Creating an Array
• Initializing an Array
• Accessing an Array
• Shortcut Syntax to Create and Initialize an Array

2. Two Dimensional Array in Java

3. Copying Arrays in Java

• Copying Arrays using Built-in System.arraycopy() Method
• Copying Arrays Using Arrays.copyOf() Method
• Copying Arrays using Object.clone() Method
• Copying Arrays using Arrays.copyOfRange() Method

4. Convert Array to ArrayList
5. Convert ArrayList to Array
6. java.util.Arrays Class API Guide

• Arrays Class Overview
• Convert Array to List
• Searching an Array
• Copying an Array
• Check Two Arrays are Deeply equal
• Filling values in an Array
• Sorting an Array
• String Representation of an Array

Read complete Arrays guide on Java Arrays Guide

Object-Oriented Programming

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• Java Interface
• Java Abstract Class
• Nested Classes in Java
• Abstraction in Java with Example
• Encapsulation in Java with Example
• Inheritance in Java with Example
• Polymorphism in Java with Example
• Composition in Java with Example
• Aggregation in Java with Example
• Association in Java with Example
• Cohesion in Java with Example
• Coupling in Java with Example
• Delegation in Java with Example
• Oops Concepts in Java
• How to Make Immutable Class in Java
• Packages in Java with Examples
• Overloading Constructors in Java with Examples
• Method Overloading in Java with Examples

String Handling

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• Java String Class API Guide
• Guide to Java String Constant Pool
• Guide to String Best Practices in Java (Best Practice)
• String Special Operations with Examples
• String Comparison Methods with Examples
• String Methods for Character Extraction
• String Searching Methods with Examples
• String Modifying Methods with Examples
• Java StringBuffer Class API Guide
• Java StringBuilder Class API Guide

Read complete String Handling in Java on String Handling API Guide 

Exception Handling

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Exception Handling Basics

Java Exception Handling Guide
How the Exception Handling Works in Java
Three Types of Exceptions in Java
Exceptions Hierarchy in Java
Java Chained Exceptions
java.lang.Throwable Class in Java

Exception Handling Keywords

Exception Handling Keywords in Java
Java try/catch block
Java throw Keyword
Java throws Keyword
Java finally Block

Exception Handling Advantages and Best Practices

The try-with-resources Statement
Advantages of Java Exceptions
Java Exception Handling Best Practices

Serialization in Java

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• Guide to Serialization in Java
• Java Transient Keyword
• Guide to the understanding of serialVersionUID
• Secure Coding Standards for Java Serialization

Guide to Collections Framework

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• Collections Framework in Java

Interfaces

• Collections Framework - The Collection Interface
• Collections Framework - The Set Interface 
• Collections Framework - The SortedSet Interface 
• Collections Framework - The List Interface
• Collections Framework - The Queue Interface
• Collections Framework - The Deque Interface
• Collections Framework - The Map Interface 
• Collections Framework - The SortedMap Interface

List Implementations

General-Purpose List Implementations:

• Collections Framework - ArrayList Class
• Collections Framework - LinkedList Class

Special-Purpose List Implementations:

• Collections Framework - CopyOnWriteArrayList

Set Implementations

General-Purpose Set Implementations:

• Collections Framework - HashSet Class
• Collections Framework - LinkedHashSet Class
• Collections Framework - TreeSet Class

Special-Purpose Set Implementations:

• Collections Framework - CopyOnWriteArraySet
• Collections Framework - EnumSet

Map Implementations

General-purpose Map Implementations:

• Collections Framework - HashMap Class
• Collections Framework - LinkedHashMap Class
• Collections Framework - TreeMap class

Special-Purpose Map Implementations:

• Collections Framework - EnumMap
• Collections Framework - WeakHashMap
• Collections Framework - IdentityHashMap

Sorting

• Guide to Algorithms used in Java Library
• Guide to Comparable Interface
• Guide to Comparator Interface
• Sorting in Collections with Examples

Aggregate Operations(Streams)

• Collections Aggregate Operations
• Stream Reduction Operations

Collections Helper/Utility Classes

• java.util.Collections Class API Guide(Development)

          - Sorting

          - Shuffling

          - Routine Data Manipulation

          - Searching

          - Composition

          - Finding Extreme Values

• 18 Useful Collections Utility Methods (Development)
• Java CollectionUtils Class(Development)

Best Practices and Examples

• Different Ways to Iterate over List, Set and Map in Java
• Java Collection Framework Best Practice  (Best Practice)
• Guide to Java 8 forEach Method
• Difference between Array vs ArrayList in Java (interview)
• How the Size of the ArrayList Increases Dynamically? (interview)
• How To Remove Duplicate Elements From ArrayList In Java? (interview)

Read complete Collections Framework in Java on Collections Framework Guide

Java Generics Guide 

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Java Generics Basics

Java Generics - Generics Basics

Java Generics - Benefits of Generics

Java Generics - Generic Types

Java Generics - Generic Methods in Java

Java Generics - Bounded Type Parameters

Java Generics - Wildcards

Java Generics Examples

Java Generic Methods Examples
Java Generic Interface Examples
Java Generic Class Examples
Java Generics Multiple Type Parameters Example

Java I/O

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Java I/O Basics

• Overview of Java I/O
• Java I/O Byte Streams
• Java I/O Character Streams
• Java I/O Buffered Streams
• Java I/O Object Streams
• Java I/O Data Streams

File Handling Examples

List of the File examples to show the use of Java I/O to create, read, write, modify a file and get the file’s information.

• Create File
• Write File
• Delete File
• Copy File
• Move File
• Rename File
• Append to File
• Read File using BufferReader
• Read File using BufferInputStream
• Read File using DataInputStream
• Get File Size in Bytes KB MB GB TB

File Serialization Examples

• How to write an Object to file in Java
• How to Read Object from File

File Compression Examples

• Compress Files in ZIP format in Java
• Decompress Files from a ZIP file in Java

Directory

List of the directory manipulation examples.

• Get the current working directory
• Create a directory
• Delete directory
• Copy directory
• Traverse /List a directory structure
• Check if the directory is empty

File Utilities

• Java File Utility Class
• Java Zip Utility Class
• Top File Utility Methods

Java I/O Reference

• https://docs.oracle.com/javase/tutorial/essential/io/index.html
• https://docs.oracle.com/javase/8/docs/api/java/io/package-tree.html

Read complete File handling in Java on Java I/O Guide 

Java Reflection

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• Overview of Java Reflection API
• Java Reflection for Classes
• Java Reflection for Methods
• Java Reflection for Fields
• Java Reflection for Constructors
• Java Reflection for Arrays
• Java Reflection for Enums
• Top Reflection Utility Methods
• Java Reflection Utility Class

Advance Core Java Tutorials

>> Java 8 Tutorial (Popular)

>> Java 8 Stream API Tutorial (Popular)

>> Java Multithreading Tutorial (Popular)

>> Java 8 Date Time API Tutorial (Popular)

>> Java Concurrency Tutorial (Popular)

>> Java XML Tutorial (Popular)