100 Days Of Java: A Complete Guide For Beginners

"How can I learn Java effectively in a structured way?"

"What are the key topics and skills I should focus on while learning Java?"

"Is it possible to become proficient in Java within 100 days?"

This well-structured 100-day of learning plan on Java is your one-stop guide from the beginner to the expert in Java programming.

Java still remains a critical tool in the contemporary world of technology because of its robustness and flexibility across different platforms. Whether you just want to start learning or improve your Java skills this 100-day of Java roadmap has everything you should do, step by step. Start with the basic syntax of Java and expound on object-oriented programming principles, multithreading, and advanced Java features. Each subsequent day will be built upon the previous ones ensuring that there is a clear understanding and practical use of Java concepts.

At the end of this journey, you will not only have a deep understanding about Java but also a portfolio of projects that demonstrate your expertise. Come with us on this 100-day journey and see how good you are in Java programming.

Structure of the 100-Day Java Plan

The 100 days of Java plan have been carefully divided into stages which are thoughtfully designed to give an all-round practical approach to mastering Java Language. This structured framework ensures comprehensive coverage and application from basics to advanced techniques.

Detailed Phase Breakdown:

100 Days Of Java

Let's move on a transformative journey through our meticulously designed 100-day Java learning plan. This structured approach covers foundational phases aimed at building a robust understanding and practical skills essential for success in Java Programming Language

Days 1-5: Introduction to Java

Day 1-2: Overview of Java

First things first, grasp the very basics of Java. Learn what is Java, a little bit of its history, and the different things it can be used for. There is hardly a better approach to truly appreciate its uniqueness than to compare Java with other popular languages, e.g., C++ and Python. Now set up your development environment by downloading and installing Java.

Resources:

• Introduction to Java
• History of Java
• Java vs C++ vs Python
• How to Download and Install Java?
• Setting Up the Environment in Java
• How to Download and Install Eclipse on Windows?
• Java Development Kit (JDK) in Java
• JVM and its architecture
• JDK Vs JRE Vs JVM
• Just In Time Compiler
• JIT Vs JVM
• Byte Code Vs Machine Code

Day 3-5: Java Basic Syntax

The basic syntax of Java. Writing your first firing Java program: "Hello World." The different data types, variables, and operators found in Java. Learn about Java keywords and how to scope the variables for your programs.

Resources:

• Java Basic Syntax
• First Java Program (Hello World)
• Datatypes in Java
• Primitive Vs Non-Primitive Datatypes
• Java Identifiers
• Operators in Java
• Java Variables
• Java Keywords
• Scope of Variables
• Wrapper Classes in Java

Days 6-10: Input/Output and Flow Control in Java

Day 6-7: Input/Output in Java

Learn how to take input from the user and print output in Java. Study Scanner and BufferedReader class, differences between them. Learn how to read input from the console and print formatted outputs.

Resources:

• How to take Input from users in Java
• Scanner class in Java
• BufferedReader class in Java
• Scanner vs BufferedReader in Java
• Ways to Read Input from Console in Java
• Print Output in Java
• print() Vs println() in Java
• Formatted Outputs in Java

Day 8-10: Flow Control in Java

Master the decision-making structures and loop constructs in Java. Learn about if, if-else, and if-else-if ladder constructs for decision-making. Get your hands dirty with looping constructs—namely for, while, do-while, and for-each. Understand the use of continue, break, and return statements.

Resources:

• Decision making in Java
• If Statement in Java
• If-Else Statement in java
• If-Else-If ladder in Java
• Loops in Java
• For loop
• While Loop
• Do while loop
• For each loop
• Continue Statement in java
• Break Statement In Java
• Usage of Break in Java
• Return Statement in Java

Days 11-15: Operators, Arrays, and Strings

Day 11-12: Operators in Java

Diving deep into all the kinds of operators provided by Java, such as arithmetic, unary, assignment, relational, logical, ternary, and bitwise operators, understand their purposes, types, and implement them using exercises in this section.

Resources:

• Arithmetic Operator
• Unary Operator
• Assignment Operator
• Relational Operator
• Logical Operator
• Ternary Operator
• Bitwise Operator

Day 13-14: Arrays in Java

Intro to arrays in Java, one-dimensional, multi-dimensional and jagged arrays - declaring, initialising and using array variables, class Arrays and reflection of arrays.

Resources:

• Introduction to Arrays in Java
• Arrays class in Java
• Multi-Dimensional Array in Java
• How to declare and initialize 2D arrays in Java
• Jagged array in Java
• Final Arrays in Java
• Reflect Arrays in Java
• Java util.Arrays Vs reflect.Arrays
• Java Array Programs

Day 15: Strings in Java

Understand the Java String class and the varieties of string manipulations. Let them be in a position to illustrate the differences and usages of the StringBuffer, StringBuilder, StringTokenizer, and StringJoiner classes.

Resources:

• Introduction of Strings in Java
• String class in Java Set-1 | Set-2
• Why strings are immutable in Java?
• StringBuffer class in Java
• StringBuilder class in Java
• Strings vs StringBuffer vs StringBuilder in Java
• StringTokenizer class in Java Set-1 | Set-2
• StringJoiner in Java
• Java String Programs

Days 16-20: OOP Concepts in Java

Day 16-17: Basics of OOP

Understand the very basics of OOP that are implemented in Java: At this stage, the main concepts of OOP that should be clear include classes, objects, methods, and constructors. Be aware of how these program building blocks relate to one another in obtaining modularity and reusability. Practice writing small Java programs that exercise these principles of OOP to get hands-on experience in how to generally go about actually structuring and organizing code for easier maintainability.

Day 18-19: Advanced OOP Concepts

Grasp advanced OOP principles like inheritance, abstraction, encapsulation, and polymorphism. Realize that inheritance will indeed make classes inherit properties and methods from another class, reusing its code and establishing a hierarchy. Realize abstraction, which will allow you to define only interfaces and abstract classes to create a very clear demarcation as to what class should do what and not how it should do it.
Encapsulation will enable you to protect the access of your objects from specific details, and polymorphism will help you to employ a common interface to different underlying forms (data types).

Resources:

• OOPS Concept in Java
• Why Java is not a purely Object-Oriented Language?
• Classes and Objects
• Naming Convention in Java
• Methods in Java
• Access Modifiers in Java
• Constructors in Java
• Four pillars of OOPS in Java
• Inheritance in Java
• Abstraction in Java
• Encapsulation in Java
• Polymorphism in Java
• Interfaces in Java
• This reference in Java

Day 20: Interfaces

In Java, one major aspect of abstraction is interfaces: how interfaces define methods that any class must implement, thereby enabling some extent of multiple inheritances. Learn how to define and use interfaces in your Java programs, particularly how they can be employed in writing code which is flexible and easily maintainable.

Resources:

• Java Interfaces
• Interfaces and Inheritance in Java
• Class Vs Interface in Java
• Functional Interface
• Nested Interface
• Marker Interface
• Comparator Interface

Days 21-25: Classes and Methods

Day 21-22: Classes in Java

Learn more about classes in Java, including static classes, inner classes, anonymous inner classes, and enum classes. Be capable of applying these alternative class types more competently to organize your code. Devise examples serving as a demonstration of each type of class being applied to real settings.

Resources:

• Classes and Objects
• Understanding classes and objects in Java
• Class vs interface
• Singleton class in java
• Object class in java
• Inner class in java
• Abstract classes in java
• Throwable class in java

Day 23-25: Methods in Java

Your classes and objects can use the static, final, overloading, and overriding methods to define behavior in Java. Write and use various types of methods within a Java application. Specifically, pay attention to how method overloading or overriding can increase the flexibility in your programs and extend their functionality.

Resources:

• Introduction to methods in Java
• Different method calls in Java
• Static methods Vs Instance methods in Java
• Abstract methods in Java
• Method Overriding in Java
• Method Overloading in Java
• Method Overloading Vs Method Overriding

Days 26-30: Packages and Collections

Day 26-27: Packages in Java

Packages in Java play a crucial role in organizing and structuring code, allowing developers to manage large-scale projects efficiently. On this day, you will delve into the fundamentals of packages, understanding their significance in Java programming.

Firstly, you'll explore what packages are and how they help in grouping related classes and interfaces. Packages provide a way to organize code into namespaces, preventing naming conflicts and making code more maintainable and reusable.

Resources:

• Java Packages
• How to create a package in Java
• java.util package
• java.lang package
• java.io package

Day 28-30: Collection Framework

Learn how to use the Java Collections Framework; classes and interfaces given in storing and manipulation of groups of data. The types covered are List, Set, Map; triage points got from knowing when to use each oriented point of information for efficient storing and management

Resources:

• Java Collection Framework
• Collections class in Java
• Collection Interface in Java
• List Interface in Java
• Queue Interface in Java
• Map Interface in Java
• Set Interface in Java
• SortedSet Interface in Java
• Deque Interface in Java
• Comparator in Java
• Comparator Vs Comparable in Java
• Iterator in Java

Learn advanced topics within the Java Collections Framework, including iterators and comparators. See how you can traverse collections with iterators, sort the collection, and compare its elements with comparators. Most importantly, practice using these techniques to bring some advanced funtionality to your Java programs.

• ArrayList in Java
• Vector class in Java
• Stack class in Java
• LinkedList in Java
• Priority Queue in Java
• HashMap in Java
• LinkedHashMap in Java
• Dictionary in Java
• HashTable in Java
• HashSet in Java
• TreeSet in Java
• LinkedHashSet in Java

Days 31-35: Memory Allocation and Exception Handling

Day 31-32: Memory Allocation in Java

Memory management, stack vs heap, garbage collection, and memory leaks.

Resources:

• Java Memory Management
• How are Java objects stored in memory
• Stack vs Heap memory allocation
• Types of memory areas allocated by JVM
• Garbage Collection in Java
• Heap and Stack memory allocation
• Types of JVM Garbage Collectors in Java
• Memory leaks in Java
• Java Virtual Machine(JVM) Stack Area

Day 33-35: Exception Handling in Java

Understand the critical role of exception handling in Java so that you can develop stronger software that includes some built-in resistance to various kinds of errors. Understand the concept of try-catch blocks, the throw keyword, and exception types applied in Java.

Resources:

• Exceptions in java
• Types of Exceptions
• Checked Vs Unchecked Exceptions
• Try, Catch, Finally, throw, and throws
• Flow control in Try catch block
• Throw vs Throws
• Final vs Finally vs Finalize
• User-defined custom exception
• Chained Exceptions
• Null pointer Exceptions
• Exception handling with method Overriding

Days 36-40: Multithreading and Synchronization

Day 36-38: Multithreading

Start by learning the basics of multithreading in Java: threads, what they are, and how they allow code to run in parallel. You will understand the life cycle of a thread, the difference between process and thread, and most importantly, actually have practical examples on how to create and run simple threads in your Java programs with the help of the Thread class and the Runnable interface.

Resources:

• Introduction to Multithreading in Java
• Lifecycle and Stages of a Thread
• Thread Priority in Java
• Main Thread in Java
• Thread class
• Runnable interface
• How to name a thread
• start() method in thread
• run() vs start() Method in Java
• sleep() method
• Daemon thread
• Thread Pool in Java
• Thread Group in Java
• Thread Safety in Java
• ShutdownHook
• Multithreading Tutorial

Day 39-40: Synchronization

Java serialization: no interference has to be handled very carefully. Data consistency can be guaranteed by two cooperating threads by this better withoutaze as they help a programmer achieve fine-grained synchronization. Wait, Notify, and Notify All help understand the cooperating threads in their communication mechanisms and how you can achieve coordination between any two threads.

Resources:

• Java Synchronization
• Importance of Thread synchronization in Java
• Method and Block Synchronization in Java
• Local frameworks vs thread synchronization
• Atomic Vs Volatile in Java
• Atomic Vs Synchronized in Java
• Deadlock in Multithreading
• Deadlock Prevention and Avoidance
• Lock Vs Monitor in Concurrency
• Reentrant Lock

Days 41-45: File Handling and Java Regex

Day 41-43: File Handling

Learn the fundamentals of Java file handling: reading and writing files. Know the predefined classes under java.io for file operations: File, FileReader, FileWriter, BufferedReader, and BufferedWriter. Set around practicing through writing a few Java programs that perform simple file operation execution like creating a file, reading into it, writing to it, and deletion of the file.

Resources:

• File Class in java
• How to create files in java
• How to read files in java
• How to write on files in java
• How to delete a file in java
• File Permissions
• FileReader
• File Writer
• FileDescriptor class
• RandomAccessFile class

Day 44-45: Java Regex

Learn how to use regular expressions (regex) in Java. Study the Pattern and Matcher classes for regex operations, including writing regex expressions, using quantifiers and character classes. Practice applying regex for text processing and validation tasks in Java programs.

Resources:

• Introduction to Java Regex
• How to write Regex expressions
• Matcher class
• Pattern class
• Quantifiers
• Character class

Days 46-50: Java IO and Networking

Day 46-47: Java IO

Understand the Java IO system, which handles input and output operations. Learn about Reader and Writer classes for character-based IO, and FileInputStream, FileOutputStream, BufferedReader, and BufferedWriter for efficient IO operations in Java.

Resources:

• Introduction to Java IO
• Reader Class
• Writer Class
• FileInput stream
• File Output stream
• BufferedReader Input Stream
• BufferedReader Output stream
• BufferedReader vs Scanner
• Fast I/O in Java

Day 48-50: Java Networking

Explore networking concepts in Java, including IP addresses, ports, sockets, and protocols. Learn how to use classes from the java.net package to create client-server applications, handle TCP/IP and UDP protocols, and work with URLs in Java networking.

Resources:

• Introduction to Java Networking
• TCP architecture
• UDP architecture
• IPV4 Vs IPV6
• Connection-oriented Vs connectionless protocols
• Socket programming in Java
• Server Socket class
• URL class and methods

Days 51-55: Java SE 8 Features and Date & Time

Day 51-53: Java SE 8 Features

Explore the new features introduced in Java SE 8, including lambda expressions, the Stream API, new Date/Time API, default methods in interfaces, and functional interfaces. Understand how these features enhance Java programming flexibility and productivity.

Resources:

• Lambda Expressions
• Streams API
• New Date/Time API
• Default Methods
• Functional Interfaces
• Method references
• Optional class
• Stream Filter
• Type Annotations
• String Joiner
• Java Generics

Day 54-55: Java Date & Time

Learn to work with dates and times in Java using the Date class, comparing dates, and handling current date/time operations. Understand the methods of the Date class and practice date manipulation tasks in Java.

Resources:

• Date Class in Java
• Methods of the Date class
• Java Current Date and time
• Compare dates in Java

Days 56-60: Java JDBC and Miscellaneous

Day 56-57: Java JDBC

Understand JDBC working fundamentals, the way Java applications make a connection with the database, and understanding how to set up environments for JDBC. Ability to set up JDBC environments including loading JDBC drivers and establishing connections. Execute basic database operations such as running a SQL query from Java applications to prepare, read, update, or delete data entries.

Resources:

• Introduction to Java JDBC
• JDBC Driver
• JDBC Connection
• Types of Statements in JDBC
• JDBC Tutorial

Day 58-60: Miscellaneous

Explore miscellaneous topics in Java programming, including the Reflection API, JavaFX for GUI applications, Java Remote Method Invocation (RMI), and new features in Java 17.

Resources:

• Introduction to Reflection API
• Java IO Tutorial
• JavaFX Tutorial
• Java RMI
• How to Run Java RMI application?
• Java 17 New Features

Days 61-70: Project and Practice

Day 61-65: Java Practice Problems

Solve practice problems and coding exercises to reinforce Java programming concepts and improve problem-solving skills.

Resources:

Java Exercises – Basic to Advanced Java Practice Programs with Solutions

Day 66-70: Real-World Project

Select a real-world project idea and apply the learned Java concepts to develop a complete Java application. Focus on code organization, best practices, and implementing project requirements.

For Example:

Top 50 Java Project Ideas For Beginners & Advanced

Days 71-90: Interview Preparation and Advanced Topics

Day 71-80: Interview Questions

Prepare for Java interviews by studying core Java interview questions, multiple-choice questions, and solving coding challenges.

Resources:

• Core Java Interview Questions
• Java Multiple Choice Questions

Day 81-90: Advanced Topics

Explore advanced Java topics such as JVM internals, performance tuning, concurrency, and security. Deepen your understanding of Java programming with these advanced concepts.

Resources:

• 12 Tips to Optimize Java Code Performance
• Java Concurrency – yield(), sleep() and join() Methods

Days 91-100: Specialization and Portfolio Building

Day 91-95: Specialization

Focus on specialized areas like Android development, web development using Java frameworks, or cloud application development with Java.

Resources:

• Java For Android – Building Your First Android App
• Web Developer or Android Developer – Which One is Better Career Choice?
• Top 10 Java Frameworks You Should Know in 2024
• 7 Best Frameworks For Full Stack Java Developers
• Top 10 Most Popular Java Frameworks for Web Development
• Cloud Computing Platforms and Technologies

Day 96-100: Portfolio Building

Build and polish your Java portfolio by documenting and sharing your projects on platforms like GitHub and LinkedIn. Showcase your skills and projects to potential employers or clients.

While this guide provides a solid structure, for a more comprehensive and flexible learning experience, consider enrolling in our "Master Java Programming - Complete Beginner to Advanced" self-paced video course. This course is designed to help you master Java at your own pace with expert-led tutorials and hands-on coding exercises.

Conclusion

This is a way through which it can be concluded that the 100-day Java learning plan is a structured pathway to mastering one of the world’s most used programming languages. Throughout this, you have delved into Java’s fundamentals from basic syntax to more complex areas such as multithreading and collections. By regularly working on coding exercises and developing real-life applications, you have not only increased your programming skills but also developed an attitude of continuous improvement.

Java proficiency goes beyond technical knowledge, remember as you end this journey with transformation— it enables you to address intricate challenges and create diverse tech spaces. These abilities will form a firm base for your careers in building strong apps or even taking up more certificates whether you are planning on advancing yourself in your profession. Keep working on improving your skills, remain curious and embrace the Java skills that you possess to make an impact in this fast changing world of software development.