☕ Java Practice Programs

A collection of 74 Java programs covering core OOP concepts, Collections, Exception Handling, Multithreading, File I/O, GUI, and Networking — written during BSc CS at Sir Parshurambhau College, Pune.

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📂 Topics Covered

Topic	Files
OOP Concepts	OOP.java, ClassDemo.java, Single.java, Multilevel.java, Hierarchal.java
Interfaces & Abstract	InterfaceDemo.java, InterfaceDemo1.java, AbstractDemo.java, AbstractDemo1.java
Method Overloading & Overriding	Overloading.java, OverloadingX.java, Overriding.java
Final Keyword	Final1.java, Final2.java, Final3.java
Exception Handling	ExceptionDemo1.java, ExceptionDemo2.java, ExceptionDemo3.java, ExceptionDemo4.java
Multithreading	Multi1.java → Multi7.java
Collections Framework	Collections.java, Collections1.java, Collections2.java, Collections5.java → Collections8.java
File Handling	CreateFile.java, WriteFile.java, ReadFile.java, DeleteFile.java, Buffer.java
Arrays	Array1.java, Array2.java, Array3.java, Array4.java
Strings	StringDemo.java
Wrapper Classes	Wrapper.java
GUI (AWT/Swing)	GUI1.java → GUI7.java, MarvellousCalculator.java
Networking	Server.java, Client.java
Packages	PackageDemo.java
Command Line Args	CommandLine.java, CommandLine1.java, CommandLine2.java
Finalize Method	FinalizeDemo.java → FinalizeDemo5.java
Misc	InputOutput.java, UserDefined.java, Demo.java, PPA.java, Maths.java

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🔧 How to Run

Compile any file:

javac FileName.java

Run:

java FileName

Example:

javac OOP.java
java OOP

Requires JDK 8 or above. Download from java.sun.com

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💡 Key Concepts Demonstrated

• Inheritance — Single, Multilevel, Hierarchical
• Polymorphism — Method Overloading and Overriding
• Abstraction — Abstract classes and Interfaces
• Encapsulation — Access modifiers, Getter/Setter
• Exception Handling — try/catch/finally, user-defined exceptions
• Multithreading — Thread class, Runnable interface, synchronization
• Collections — ArrayList, HashMap, LinkedList, Iterator
• File I/O — FileWriter, FileReader, BufferedReader
• GUI — AWT Components, Event Handling, Calculator app
• Networking — Socket programming, Client-Server model

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👤 Author

Rushikesh Waje MCA Student | Aspiring Data Analyst 📧 rushikeshwaje39@gmail.com 🔗 LinkedIn | GitHub