java

JAVA

• JAVA
  • Java Naming Conventions 🚀
    • 1️⃣ Class and Interface Names 📦
    • 2️⃣ Method Names 🔧
    • 3️⃣ Variable Names 📊
    • 4️⃣ Constant Names 🔠
    • 5️⃣ Package Names 📂
    • 6️⃣ File Names 📁
    • 7️⃣ Naming Conventions in Java Collections
      • Summary Table 📋
      • Final Tip 💡
  • Languages That Supports OOPS Property
    • Key Takeaways

      Java Naming Conventions 🚀

Naming conventions in Java help make code readable, maintainable, and consistent. Here are the standard naming rules:

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1️⃣ Class and Interface Names 📦

• Use PascalCase (Each word starts with an uppercase letter)
• Examples:

  class Animal {}
  class StudentDetails {}
  interface Playable {}
  interface DataProcessor {}
  

• Why? Improves readability and differentiates from variables and methods.

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2️⃣ Method Names 🔧

• Use camelCase (First word is lowercase, next words start with uppercase)
• Examples:

  void calculateSalary() {}
  void getStudentName() {}
  boolean isAvailable() {}
  

• Why? Clearly distinguishes methods from classes.

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3️⃣ Variable Names 📊

• Use camelCase
• Must be meaningful & descriptive
• Examples:

  int age;
  String studentName;
  double accountBalance;
  

• Avoid using single letters (except for loop counters like i, j, k).

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4️⃣ Constant Names 🔠

• Use UPPER*CASE with underscores (*)
• Examples:

  final double PI = 3.14159;
  final int MAX_USERS = 100;
  final String DATABASE_URL = "jdbc:mysql://localhost";
  

• Why? Constants should be easily identifiable.

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5️⃣ Package Names 📂

• Use all lowercase letters
• Use reverse domain naming convention (to avoid conflicts)
• Examples:

  package com.example.project;
  package org.companyname.module;
  package myapp.utilities;
  

• Why? Ensures uniqueness across different organizations.

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6️⃣ File Names 📁

• Must match the public class name
• Examples:

  public class Main {}   // File should be saved as Main.java
  public class StudentDetails {}   // File: StudentDetails.java
  

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7️⃣ Naming Conventions in Java Collections

Type	Naming Convention	Example
Array	Plural form	int[] numbers;
List	Singular + List	List<String> studentList;
Map	Key + “To” + Value	Map<Integer, String> idToNameMap;

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Summary Table 📋

Element	Convention	Example
Class	PascalCase	StudentDetails
Interface	PascalCase	Runnable
Method	camelCase	calculateSalary()
Variable	camelCase	studentName
Constant	UPPER_CASE	MAX_USERS
Package	lowercase	com.example.project
File Name	Same as public class	Main.java

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Final Tip 💡

✅ Follow these conventions to make your Java code clean and professional.
❌ Avoid single-letter variable names (except for loop counters).
💡 Be descriptive—choose meaningful names!

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Languages That Supports OOPS Property

Here’s an expanded table covering 20 OOP properties across C, C++, Java, Python, C#, and JavaScript:

OOP Property	C	C++	Java	Python	C#	JavaScript
Class & Objects	❌ No	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes (ES6 Classes)
Encapsulation	❌ No	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes (Using Closures)
Data Hiding	❌ No	✅ Yes (Private Members)	✅ Yes	✅ Yes (Using _ & __)	✅ Yes	✅ Limited (Private Fields in ES6)
Inheritance	❌ No	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes (Prototype-based)
Single Inheritance	❌ No	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
Multiple Inheritance	❌ No	✅ Yes	❌ No (Only via Interfaces)	✅ Yes	❌ No	❌ No
Multilevel Inheritance	❌ No	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
Hybrid Inheritance	❌ No	✅ Yes	❌ No (Using Interfaces)	✅ Yes (Using Mixins)	✅ Yes (Using Interfaces)	❌ No
Polymorphism	❌ No	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes (Duck Typing)
Method Overloading	❌ No	✅ Yes	✅ Yes	❌ No (Simulated)	✅ Yes	❌ No
Method Overriding	❌ No	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
Abstraction	❌ No	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Partial (No true abstract classes)
Abstract Classes	❌ No	✅ Yes	✅ Yes	✅ Yes	✅ Yes	❌ No
Interfaces	❌ No	✅ Yes	✅ Yes	✅ Yes (Duck Typing)	✅ Yes	❌ No
Constructors	❌ No	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
Destructors	❌ No	✅ Yes	❌ No (Uses Garbage Collection)	❌ No (Uses Garbage Collection)	✅ Yes (Finalizers)	❌ No
Operator Overloading	❌ No	✅ Yes	❌ No	✅ Yes	✅ Yes	❌ No
Function Overloading	❌ No	✅ Yes	✅ Yes	❌ No	✅ Yes	❌ No
Static Binding	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
Dynamic Binding	❌ No	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
Multiple Dispatch	❌ No	❌ No	❌ No	✅ Yes	❌ No	❌ No
Exception Handling	❌ No	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes (Try-Catch)

Key Takeaways

1. C lacks OOP features completely.
2. C++ supports full OOP, including multiple inheritance and operator overloading.
3. Java is fully OOP but does not support multiple inheritance (replaced by interfaces).
4. Python supports all OOP features, including multiple inheritance.
5. C# is fully OOP, but it does not support multiple inheritance (uses interfaces instead).
6. JavaScript uses prototype-based inheritance, lacks method overloading, and has limited abstraction.