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KADay 04/100
Just like a child inherits a surname from parents 👨👩👦
In Java, a child class inherits properties of a parent class.
♻️ Reuse code
⚡ Less effort
📚 More logic
#fyp #Inheritance #JavaOOPS #learnjava #100DaysOfCode
@kabildeveloper
#What Does Override Do In Java
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225
THJava Inheritance: The Secrets Most Developers Miss 🧬 Did you pass the quiz? Java Inheritance isn't always as straightforward as "Child extends Parent." In this video, we dive into the JVM mechanics that govern Field Hiding and Method Shadowing.
📍 QUIZ ANSWERS & EXPLANATIONS:
Q1: What is the value of 'obj.name'?
Code: A obj = new B(); System.out.print(obj.name);
Answer: A) Parent
Why: In Java, variables (fields) are hidden, not overridden. Polymorphism only applies to instance methods. Since the reference type is A, the compiler looks at class A for the variable value.
Q2: Does this compile? (Private Constructor)
Code: class Parent { private Parent() {} } class Child extends Parent { ... }
Answer: B) No (Compile Error)
Why: Every constructor in a subclass must call a constructor of the superclass (implicitly or explicitly via super()). Since the Parent's constructor is private, it is invisible to the Child class, making inheritance impossible.
Q3: What happens here? (Static Method)
Code: A obj = new B(); obj.m(); (where m is static)
Answer: B) Prints 'A'
Why: Static methods are tied to the Class, not the instance. This is called Method Hiding. Because the reference type is A, the JVM calls the static method in class A. #java #inheritance #backend #thebackendmentor #oop #javainterview #jvm #softwareengineering #cleancode #likeforlikes❤ #foryourpage❤️ #reachyourgoals #getnoticed
@thebackendmentor
44.3K
MA🔑 this Keyword in Java – Explained Simply
In Java, the this keyword refers to the current object of the class.
It is mainly used to avoid confusion between instance variables and parameters 💻
👉 Simple example:
When variable names are same,
this.variableName clearly refers to the current object’s variable.
📌 Key uses of this keyword:
✔ Refers to current object
✔ Differentiates instance variables from parameters
✔ Helps in constructor initialization
✔ Improves code clarity
📚 Very important topic for OOPs, exams & interviews.
👉 Save this post for revision
👉 Follow @mastercode.sagar for Java series
👉 Comment “NEXT” for the next topic: super keyword in Java 🚀
#Java #ThisKeyword #OOPsInJava #JavaBasics
@mastercode.sagar
168
INMethod Overloading vs Method Overriding — 90% developers confuse this 😱
If you're preparing for Java interviews, this difference is a MUST.
✔ Overloading → Same method name, different parameters
✔ Overriding → Same method signature in child class
One is compile-time. One is runtime.
Do you remember which one? 👀
Comment “OVERLOAD” or “OVERRIDE” and I’ll reply with a quick trick 🔥
Save this for interview revision 📌
#java #corejava #javadeveloper #methodoverloading #methodoverriding #polymorphism #oopsconcepts #coding #programming #developerlife #softwaredeveloper #techreels #learnjava #codinginterview #dsa #reelitfeelit
@intques_app
282
IRSame method. New behavior.
Method Overriding explained 🔥
Day 31 ✅
Method Overriding in Java made super simple 💡
In this reel, you’ll understand:
✔ What Method Overriding is
✔ How child class changes parent behavior
✔ Why Method Overriding is called Runtime Polymorphism
✔ Simple example for beginners
Agar tum Java OOPs seekh rahe ho ya interviews ke liye prepare kar rahe ho,
toh ye concept miss mat karo 💻🔥
👉 Follow for daily Java lessons
👉 Save this reel for revision
👉 Comment “DAY 31 DONE” if you understood
#java #ViralReels #ExplorePage
@irauthan.tech
143
_CInheritance 🦸♂️
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#JavaDeveloper #java
#javaprogramming
#javaoop
#inherit
@_coding__100
50.3K
MA🔌 Interface in Java – Rule Book for Classes
An interface is like a rule book that tells a class
what methods it must have, but not how to write them 💻
👉 Easy example:
Mobile charger 🔌 works with different phones 📱
Charger is the interface,
phones are the classes that implement it.
📌 Why use interface?
✔ Same rules for many classes
✔ Flexible & clean code
✔ Supports multiple inheritance
📚 Very important topic for OOPs, exams & interviews.
👉 Save this reel for revision
👉 Follow @mastercode.sagar for Java series
👉 Comment “NEXT” for Exception Handling in Java 🚀
#Java #InterfaceInJava #OOPsInJava #JavaBasics
@mastercode.sagar
48.4K
MA🎯 Abstraction in Java – Show What, Hide How
Abstraction is one of the most important pillars of OOPs in Java 💻
It focuses on showing only essential features while hiding the internal working.
👉 Real-life example:
ATM machine 🏧
You enter the amount and get cash,
but you never see the internal process.
Java me abstraction bhi bilkul aise hi kaam karta hai.
📌 Key points:
✔ Hides implementation details
✔ Improves security
✔ Reduces complexity
✔ Makes code easy to maintain
📚 Very important for OOPs, exams & interviews.
👉 Save this post for revision
👉 Follow @mastercode.sagar for Java series
👉 Comment “NEXT” for the next topic: Interface in Java 🚀
#Java #AbstractionInJava #OOPsInJava #JavaBasics
@mastercode.sagar
1.3K
DUThrowable class methods: printStackTrace(), toString(), getMessage(). Easy exception info for child classes. #JavaExceptions #ThrowableClass #ProgrammingTips #CodeHelp #JavaDev #CodingExplained
@durgajobsinfo
243
THThe execution follows a very specific (and often misunderstood) order:
🧠1: The "Order of Operations" Trap
1️⃣ Static Blocks first: These run when the class is loaded. Parent (A) runs before Child (B).
2️⃣ Instance Blocks & Parent Constructor: Before the child can exist, the parent must be born! Parent blocks and A() constructor execute.
3️⃣ Child Instance & Constructor: Finally, Child (B) instance blocks and the B() constructor finish the job.
Rule of Execution: Statics > Parents > Children. 🚀
⚡ 2: The "Static One-Timer"
Don’t let the new keyword fool you! 🛑
In Java, Static Initializers are executed only ONCE per class, specifically when the JVM loads the class into memory. Even if you create 10, 100, or 1,000 objects of Class B:
The static block runs exactly one time.
The instance blocks and constructors run every single time a new object is created.
Static = Class level. Instance = Object level. Know the difference! 💡
💀 3: The "Expert Level" Constructor Trap
This is the ultimate Java interview "Gotcha"! 🧨 Here is why the output is 0 and not 5:
1️⃣ Memory Allocation: When new B() is called, Java allocates memory and sets x to its default value (0).
2️⃣ Parent First: The constructor of A runs before B's variable x is assigned the value 5.
3️⃣ Polymorphism: A's constructor calls show(). Since the object is actually a B, Java calls the overridden show() in Class B.
4️⃣ The Catch: At this exact moment, x is still 0 because the child’s initialization hasn't reached the x = 5 line yet!
Pro-Tip: Never call overridable methods inside a constructor. It leads to "partially initialized" objects! ⚠️
#java #backenddeveloper #viralpost #backend #javatips #codinglife💻 #codingisfun .....
@thebackendmentor
648.7K
EN🧠 Java MCQs That Trap Even Experienced Devs 👀
1️⃣ Can constructors be overridden?
❌ NO — constructors aren’t inherited
Reason:
Constructors are not inherited, so they cannot be overridden.
Overriding works only with inherited methods.
2️⃣ What if a method is final?
❌ Cannot be overridden (but can be inherited)
Reason:
A final method can be inherited, but cannot be overridden by child classes.
3️⃣ Calling static method using null reference?
😈 Still works! → Output: Static
Reason:
• show() is a static method
• Static methods are called using class reference, not object
• JVM converts it to: Test.show();
So no NullPointerException occurs.
🤯 One static rule saves you from NPE
💬 Comment your score: 0/3 | 1/3 | 2/3 | 3/3
👥 Tag a friend who expects NullPointerException 😅
❤️ Save this for interview revision
➡️ Follow for daily Java MCQs & placement prep
#JavaMCQs #JavaReels #StaticMethod #FinalKeyword #ConstructorInJava #CodingReels #LearnJava #JavaInterview #PlacementPreparation #DeveloperLife 🚀
@engineeringmarathi
39.7K
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