THE JAVA ENVIRONMENT:

• Installing Java.
• Java Program Development
• Java Source File Structure
• Compilation
• Executions

BASIC LANGUAGE ELEMENTS:

• Lexical Tokens
• Identifiers
• Keywords
• Literals
• Comments
• Primitive Data types
• Operators
• Assignments

• Class Fundamentals
• Object & Object reference
• Object Life time & Garbage Collection
• Creating and Operating Objects
• Constructor & initialization code block
• Access Control, Modifiers, and methods
• Nested, Inner Class &Anonymous Classes
• Abstract Class & Interfaces
• Defining Methods, Argument Passing Mechanism
• Method Overloading, Recursion.
• Dealing with Static Members. Finalize () Method.
• Native Method. Use of “this “reference.
• Use of Modifiers with Classes & Methods.
• Design of Assessors and Mutator Methods
• Cloning Objects, shallow and deep cloning
• Generic Class Types

• Use and Benefits of Inheritance in OOP
• Types of Inheritance in Java
• Inheriting Data Members and Methods
• Role of Constructors in inheritance
• Overriding Super Class Methods.
• Use of “super”.
• Polymorphism in inheritance.
• Type Compatibility and Conversion
• Implementing interfaces

• Organizing Classes and Interfaces in Packages.
• Package as Access Protection
• Defining Package.
• CLASSPATH Setting for Packages.
• Making JAR Files for Library Packages
• Import and Static Import
• Naming Convention for Packages

• The Idea behind Exception
• Exceptions & Errors
• Types of Exception
• Control Flow in Exceptions
• JVM reaction to Exceptions
• Use of try, catch, finally, throw, throws in Exception Handling.
• In-built and User-Defined Exceptions
• Checked and Un-Checked Exceptions

• Defining an Array
• Initializing & Accessing Array
• Multi-Dimensional Array
• Operation on String
• Mutable & Immutable String
• Using Collection Bases Loop for String
• Tokenizing a String
• Creating Strings using String Buffer

• Understanding Threads
• Needs of Multi-Threaded Programming.
• Thread Life-Cycle
• Thread Priorities
• Synchronizing Threads
• Inter Communication of Threads
• Critical Factor in Thread –DeadLock

• Applet & Application
• Applet Architecture.
• Parameters to Applet
• Embedding Applets in Web page.
• Applet Security Policies

• Utility Methods for Arrays
• Observable and Observer Objects
• Date & Times
• Using Scanner
• Regular Expression
• Input/output Operation in Java(java.io Package)
• Streams and the new I/O Capabilities
• Understanding Streams
• The Classes for Input and Output
• The Standard Streams
• Working with File Object
• File I/O Basics
• Reading and Writing to Files
• Buffer and Buffer Management
• Read/Write Operations with File Channel
• Serializing Objects

• Designing Graphical User Interfaces in Java
• Components and Containers
• Basics of Components
• Using Containers
• Layout Managers
• AWT Components
• Adding a Menu to Window
• Extending GUI Features Using Swing Components
• Java Utilities (java.util Package)
• The Collection Framework:
• Collections of Objects
• Collection Types
• Sets
• Sequence
• Map
• Understanding Hashing
• Use of Array List & Vector

• Event-Driven Programming in Java
• Event- Handling Process
• Event-Handling Mechanism
• The Delegation Model of Event Handling
• Event Classes
• Event Sources
• Event Listeners
• Adapter Classes as Helper Classes in Event Handling
• Anonymous Inner classes a Short –cut to Event Handling
• Avoiding Deadlocks in GUI Code
• Event Types & Classes
• Networking Programming
• Networking Basics
• Client-Server Architecture
• Socket Overview
• Networking Classes and Interfaces
• Network Protocols
• Developing Networking Applications in Java

• Introduction to JDBC
• JDBC Drivers & Architecture
• CURD operation Using JDBC
• Connecting to non-conventional Databases.

• Introduction to Email Technical Internals
• Understanding of POP and SMTP framework
• Complete understanding the email API
• Mass mailer Application development
• Introduction to J2EE
• J2EE Overview
• Why J2EE?
• J2EE Architecture
• J2EE APIs
• J2EE Containers

• SERVLET
• Web Application Basics.
• Architecture and challenges of Web Application.
• Introduction to servlet
• Servlet life cycle
• Developing and Deploying Servlets
• Exploring Deployment Descriptor (web.xml).
• Handling Request and Response
• Initializing a Servlet
• Accessing Database
• Servlet Chaining
• Session Tracking & Management
• Dealing with cookies
• Transferring Request
• Accessing Web Context
• Passing INIT and CONTEXT Parameter
• Sharing information using scope object
• Controlling concurrent access
• User Authentication
• Filtering Request and Response
• Programming Filter
• Filter Mapping
• Servlet Listeners 

According to the Stackoverflow survey, Java is in the top five most used languages. That means companies are actively using Java for their projects and therefore there are enough job opportunities in this field.

Yes You CAN learn the Java programming language in a month, If you already know OOPs concepts.

The simple answer is that yes. But if you know the basic concepts of programming language then you can also master Java programming.

These are the top companies using Java

• Uber.
• Airbnb.
• Google.
• Netflix.
• Pinterest.
• Instagram.
• Spotify.
• Amazon.