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All LessonsFree Lessons (5)

Java Ecosystem

Introduction Java & it's Ecosystem Java Virtual Machine Java Flavors & Processes Java Tools & Files

Methods

Variable Argument Passing Pass by Value Pass by Reference Method Overloading

Classes

Accessibility The Object Class Constructors Initialization Classes Nested Classes Anonymous and Local Classes Abstract Classes Final Class Super Keyword Finalize

Interfaces

Interfaces More on Interfaces

Inheritance

Inheritance Multiple Inheritance Inheritance Gotchas

Lambda Expressions

Basics More on Lambdas

Generics

Why Generics Raw Types Generic Types Bounded Types Type Inference Erasure Bridge Methods Wildcard The Get & the Put Principle Reification

Multi-Threading

Fundamentals Thread Safety Mutexes vs Semaphores Synchronized Volatile Wait() and Notify()More on Threading

Memory Management

Memory Areas Reference Strengths Garbage Collection Memory Tuning

Collections

Collection Types Iterating in Java Summary

Exceptions

Exceptions Checked vs Unchecked Catch Block More on Exceptions

Reflection

Introduction java.lang.Class Class Modifiers Instantiation using Reflection Classloaders

Serialization

Basics More on Serialization

Miscellaneous Topics

Types Keywords Annotations Boxing Unboxing Package Strings Casting

Java in Practice

Object Creation

Designing Classes

Inheritance vs Composition

Interfaces vs Abstract Classes

Enums & Annotations

General Best Practices

Exceptions Handling

Patterns

Singleton Builder Cheat Sheet

The End

Practice Mock Interview

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Object Creation

Object Creation

This lesson summarizes the important details for object creation in Java.

We'll cover the following...

Notes on Instantiating Objects

Static factory methods should be preferred to constructors when designing classes. Designing classes this way offers more flexibility when returning objects, for instance:
- We can return an object of a subclass of the return type.
- We can choose not to return a new instance everytime. Singleton and ...