Internet of Things (IoT) & Arduino G.C.E AL ICT Lesson 11.4 Questions Notes Tamil Medium PDF English Class Examples

🎓 Final Master Notes • Sections 46–53

🌐 G.C.E. A/L ICT – Competency 11.1 | IoT Complete Notes

முழுமையான IoT, Embedded Systems, Arduino, Sensors, Actuators Notes | Key Terms, Exam Points, Structured Questions & Answers, Master Formula, Last-Minute Revision Sheet

🔤 Key Terms ⭐ Exam Points 📝 Structured Q&A 🧮 Master Formula 🧠 Revision Sheet 🎯 A/L Ready

⚡ Quick Answer | What is Competency 11.1 about? (AEO Featured Snippet)

Competency 11.1 என்பது Internet of Things (IoT) மற்றும் Embedded Systems-ன் அடிப்படை building blocks-ஐ கற்றுத்தருகிறது. மாணவர்கள் Sensors (LDR, Temperature, Reed switch), Microcontrollers (Arduino), மற்றும் Actuators (LED, Fan, Buzzer) பயன்படுத்தி real-world problems-க்கு solutions-ஐ உருவாக்குவதை இது உள்ளடக்குகிறது. Master Formula: Real World → Sensor → Input → Microcontroller → Decision → Output → Actuator → Physical Action.

🔤 Section 46 – Key Terms (Tamil + English)

🔤 46. முக்கிய Terms – Tamil + English Glossary ▼

இந்த chapter-ல் வரும் அனைத்து technical terms-ம் இங்கே Tamil + English-ல் தொகுக்கப்பட்டுள்ளன. Exam-ல் இரு மொழிகளிலும் எழுதத் தெரிந்திருக்க வேண்டும்.

English Term	தமிழ் அர்த்தம்	Category
Embedded System	உட்பொதிக்கப்பட்ட அமைப்பு	Concept
Development Board	மேம்பாட்டு பலகை	Hardware
Microcontroller	நுண்கட்டுப்படுத்தி	Hardware
Microprocessor	நுண்செயலி	Hardware
Sensor	உணர்கருவி	Input
Actuator	செயல்படுத்தி	Output
Analog Input	ஒத்திசைவு உள்ளீடு	Signal Type
Digital Input	இலக்க உள்ளீடு	Signal Type
Digital Output	இலக்க வெளியீடு	Signal Type
IDE	ஒருங்கிணைந்த மேம்பாட்டு சூழல்	Software
Compiler	தொகுப்பி	Software
Code Editor	நிரல் தொகுப்பி/எழுத்தி	Software
Programmer	நிரல் ஏற்றும் கருவி/முறை	Software
Reset	மீளமைப்பு	Control
Power Supply	மின்சார வழங்கல்	Hardware
Receive (RX)	பெறுதல்	Communication
Transmit (TX)	அனுப்புதல்	Communication
LDR	ஒளி சார்ந்த மின்தடை	Sensor
Reed Switch	காந்தத்தால் இயங்கும் switch	Sensor
Physical Computing	பௌதிக கணினியியல்	Concept

📚 Study Tip: இந்த terms-ஐ flashcard-ஆக எழுதி தினமும் revise செய்யுங்கள். Structured questions-ல் Tamil + English இரண்டையும் பயன்படுத்தலாம்.

⭐ Section 47 – Most Important Exam Points

⭐ 47. மிகவும் முக்கியமான Exam Points ▼

இந்த chapter-ஐ படிக்கும்போது கீழே உள்ளவற்றை மனப்பாடமாக மட்டும் அல்லாமல் concept-ஆகவும் தெரிந்திருக்க வேண்டும்.

A. Development Boards Examples

Arduino Raspberry Pi Micro:bit

B. Arduino Features

Analog Input Digital Input Microcontroller Digital Output RX/TX USB Power Reset

C. RX/TX

RX = Receive (பெறுதல்)
TX = Transmit (அனுப்புதல்)

D. IDE Components

Code Editor + Compiler + Programmer/Upload facility
மூன்றும் சேர்ந்த software environment.

E. Applications

LED control LDR-based auto light Temperature fan Reed-switch door

F. Basic Architecture

Input → Processing → Output
எந்த IoT system-க்கான universal model.

G. Important Components

Sensor → Input
Microcontroller → Processing
Actuator/Output → Action

H. Signal Types

Analog = continuous values
Digital = discrete states (0/1)

🎯 Exam Strategy: இந்த 8 points-ஐ "mind map"-ஆக வரைந்து 5 minutes-ல் revise செய்யுங்கள்.

📝 Section 48 – Exam-Style Q&A (FAQ Schema Ready)

📝 48. Exam-Style Questions & Answers (14 Important Q&A) ▼

இந்த Q&A தொகுப்பு A/L MCQ, Structured மற்றும் Essay கேள்விகளுக்கு ஏற்றது. Google Featured Snippets-க்கும் optimize செய்யப்பட்டுள்ளது.

Q1. What is an Embedded System?

ஒரு குறிப்பிட்ட செயல்பாட்டைச் செய்வதற்காக ஒரு electronic/mechanical system-க்குள் உட்பொதிக்கப்பட்ட computer-based control system Embedded System எனப்படும்.
Example: Washing machine controller, Microwave oven controller.

Q2. What is a Microcontroller?

CPU, memory, input/output interfaces மற்றும் பிற control-related hardware components ஆகியவற்றை ஒரே chip-ல் கொண்டிருக்கும் சிறிய programmable control device Microcontroller ஆகும்.
Example: ATmega328P in Arduino Uno.

Q3. Give three examples of development boards.

Arduino Raspberry Pi Micro:bit

Q4. What is an Analog Input?

மாறிக்கொண்டிருக்கும் continuous physical/electrical signal-ஐ development board-க்கு input ஆகப் பெறுவது Analog Input ஆகும்.
Example: LDR மூலம் light intensity reading (0–1023 range).

Q5. What is a Digital Input?

பொதுவாக இரண்டு நிலைகளைக் (HIGH/LOW) கொண்ட input signal-ஐ development board படிப்பது Digital Input ஆகும்.
Example: Push button / Reed switch.

Q6. What is Digital Output?

Development board-இலிருந்து digital control signal ஒன்றை output device-க்கு வழங்குவது Digital Output ஆகும்.
Example: LED ON/OFF, Buzzer ON/OFF.

Q7. What is RX?

RX என்பது Receive என்பதன் சுருக்கம். Serial communication மூலம் data பெறப் பயன்படுத்தப்படும் pin. Arduino Uno-வில் Pin 0.

Q8. What is TX?

TX என்பது Transmit என்பதன் சுருக்கம். Serial communication மூலம் data அனுப்பப் பயன்படுத்தப்படும் pin. Arduino Uno-வில் Pin 1.

Q9. What is the function of USB port?

Computer மற்றும் development board இடையே connection ஏற்படுத்தவும், program upload செய்யவும், serial communication செய்யவும், power supply வழங்கவும் USB பயன்படுத்தப்படலாம்.

Q10. What is IDE?

IDE – Integrated Development Environment. Program எழுத, compile செய்ய மற்றும் development board-க்கு upload/program செய்ய உதவும் software environment.
Example: Arduino IDE.

Q11. What is LDR?

LDR – Light Dependent Resistor. வெளிச்சத்தின் intensity-க்கு ஏற்ப அதன் resistance மாறும் component. Analog input-ஆக பயன்படும்.

Q12. Give an application of LDR.

Automatic street light / automatic room light.
இருட்டாகும்போது LED ON; வெளிச்சமாகும்போது LED OFF.

Q13. What is a Reed Switch?

Magnetic field-ன் தாக்கத்தால் open/close ஆகும் switch Reed Switch எனப்படும்.
Application: Door open/close detection.

Q14. How can a temperature sensor be used to control a fan?

Process: Temperature sensor மூலம் temperature reading பெறப்படுகிறது. Microcontroller அந்த value-ஐ threshold value-உடன் compare செய்கிறது. Temperature threshold-ஐ விட அதிகமாக இருந்தால் fan ON செய்யப்படுகிறது; இல்லையெனில் OFF செய்யப்படுகிறது.

Logic:
IF temperature > threshold THEN Fan ON ELSE Fan OFF

📊 Sections 49-51 – Structured Question Examples

🌡️ 49. Structured Q: Automatic Fan System (Classroom) ▼

Question: ஒரு classroom-ல் temperature அதிகரிக்கும்போது fan தானாக ON ஆகும் system ஒன்றை உருவாக்க வேண்டும்.

Part	Question	Answer
(a)	Input device ஒன்றைக் குறிப்பிடுக	Temperature sensor
(b)	Processing device?	Microcontroller / Development board
(c)	Output device?	Fan
(d)	Basic condition எழுதுக	IF temperature > threshold     Fan ON ELSE     Fan OFF

(e) System Diagram

Temperature Sensor ↓ Analog Input ↓ Microcontroller ↓ Compare Temperature ↓ Driver/Relay ↓ Fan

⚠️ Important Exam Tip: பெரிய fan/motor-ஐ நேரடியாக microcontroller pin-ல் இணைக்கக்கூடாது. Driver/Relay தேவை என்பதை diagram-ல் காட்ட வேண்டும்.

💡 50. Structured Q: Automatic Light System (Room) ▼

Question: ஒரு room-ல் வெளிச்சம் குறைந்தால் LED தானாக ON ஆக வேண்டும்.

Input

LDR

Processing

Microcontroller

Output

LED

System Flow

LDR ↓ Analog Input ↓ Microcontroller ↓ Compare Light Level ↓ LED ON/OFF

Logic / Pseudocode

IF light < threshold LED ON ELSE LED OFF

💡 Exam Answer Format: Input, Processing, Output, System diagram, Logic/Pseudocode ஆகிய 5 parts-ஐயும் தெளிவாக எழுதுங்கள்.

🚨 51. Structured Q: Door Security System (Reed Switch) ▼

Question: ஒரு வீட்டின் கதவு திறக்கப்பட்டவுடன் buzzer ON ஆகும் system ஒன்றை உருவாக்குக.

Input

Reed switch

Processing

Microcontroller

Output

Buzzer

System Flow

Door ↓ Reed Switch ↓ Digital Input ↓ Microcontroller ↓ Buzzer

Logic / Pseudocode

IF door is OPEN Buzzer ON ELSE Buzzer OFF

📌 Note: Reed switch ஒரு Digital Input (HIGH/LOW only). LDR மற்றும் Temperature sensor ஆகியவை Analog Input.

🧮 Section 52 – Master Formula (One Formula, Whole Chapter)

🧮 52. ஒரே Formula-வில் முழு 11.1 Chapter | Master Architecture ▼

இந்த ஒரு structure-ஐ நன்றாகப் புரிந்துகொண்டால் chapter மிகவும் எளிதாகிவிடும். எந்த IoT/Embedded system question-க்கும் இதை apply செய்யலாம்.

REAL WORLD ↓ SENSOR ↓ INPUT ↓ ┌────────────────┐ │ MICROCONTROLLER│ │ + PROGRAM │ └────────────────┘ ↓ DECISION ↓ OUTPUT ↓ ACTUATOR ↓ PHYSICAL ACTION

Example 1 – Automatic Light

Light (Real World) ↓ LDR (Sensor) ↓ Analog Input ↓ Arduino (Microcontroller + Program) ↓ Compare with Threshold (Decision) ↓ Digital Output ↓ LED (Actuator) ↓ Light ON/OFF (Physical Action)

Example 2 – Automatic Fan

Temperature → Sensor → Arduino → Fan (via Relay)

Example 3 – Smart Door Alarm

Door → Reed Switch → Arduino → Buzzer

🎯 Exam Power Tip: இந்த formula-ஐ exam-ல் block diagram-ஆக வரையுங்கள். 10/10 marks guaranteed! Input, Processing, Output மூன்றையும் தெளிவாக குறிப்பிடவும்.

🧠 Section 53 – Last-Minute Revision Sheet

🧠 53. Last-Minute Revision Sheet | 15 Core Points ▼

தேர்வுக்கு முன் இந்த 15 points-ஐ மட்டும் revise செய்தாலும் chapter-ன் core concept நினைவில் இருக்கும்.

1

Embedded System → குறிப்பிட்ட task செய்யும் system. Example: Washing machine controller.

2

Development Board → hardware applications develop/test செய்யும் board.

3

Arduino → popular open-source development platform.

4

Microcontroller → system-ன் control/processing component (CPU+Memory+I/O on one chip).

5

Analog Input → continuously varying input (LDR, Temperature sensor).

6

Digital Input → digital state input (Button, Reed switch).

7

Digital Output → device control signal (LED ON/OFF).

8

RX → Receive (Pin 0 on Arduino Uno).

9

TX → Transmit (Pin 1 on Arduino Uno).

10

USB → computer connection / program transfer / power supply.

11

Power Supply → board-க்கு electrical power வழங்கும்.

12

Reset → program execution-ஐ மீண்டும் ஆரம்பிக்க (restart from setup()).

13

IDE → code + compile + upload/program workflow (Eg: Arduino IDE).

14

LDR → light sensing (Light Dependent Resistor).

15

Reed Switch → magnetic door detection (open/close sensor).

🎯 Sensor Examples

LDR Temperature Reed Switch PIR Ultrasonic

⚙️ Actuator Examples

LED Fan Buzzer Motor Relay

📊 🎁 Bonus: 3 Main Applications Comparison Table ▼

Exam-ல் அடிக்கடி வரும் மூன்று முக்கிய applications-ஐ ஒரே table-ல் compare செய்யுங்கள்:

Application	Sensor (Input)	Signal Type	Processing	Output	Logic
Automatic Light	LDR	Analog	Arduino	LED	IF light < threshold → LED ON
Automatic Fan	Temperature Sensor	Analog	Arduino	Fan (via Relay)	IF temp > 30°C → Fan ON
Door Security	Reed Switch	Digital	Arduino	Buzzer / LED	IF door OPEN → Buzzer ON

🏆 Exam Master Tip: எந்த IoT question வந்தாலும், இந்த 5 elements-ஐ தெளிவாக எழுதுங்கள்: Input Sensor → Signal Type → Processing Device → Decision Logic → Output Actuator.

🎓 Competency 11.1 – Complete IoT Notes Ready!

இந்த notes GCE A/L ICT Exam-க்கு முழுமையாக தயாராக உதவும். Sections 1–53 (4 Parts) முழுவதையும் படித்து, structured questions-ஐ practice செய்து, block diagrams வரையப் பழகினால் 100% success guaranteed!

🔑 Final Mantra: Real World → Sensor → Input → Microcontroller → Decision → Output → Actuator → Physical Action

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Java Programming Inheritance, Polymorphism, Algorithms & Integrated Project Notes - Class 4

☕ Java Programming • Class 4

Inheritance, Polymorphism, Algorithms & Integrated Project

Master advanced Object-Oriented Programming concepts including inheritance hierarchies, runtime polymorphism, classic algorithmic strategies (Greedy, DP, Divide & Conquer), and build a complete Student Management System.

🧬 Inheritance 🎭 Polymorphism 🧠 Algorithms 🎒 Knapsack 🌳 Huffman 🚀 Integrated Project

🧬 CLASS 4 – PART A: Inheritance & Polymorphism

🏗️ A.1 What is Inheritance? ▼

Inheritance lets a new class reuse the fields and methods of an existing class. The existing class is the parent (superclass / base class); the new class is the child (subclass / derived class).

💡

Inheritance models an "is-a" relationship: a Student is a Person; a Dog is an Animal. Common data (like name) is written once in the parent instead of being copied into every child class. This reduces duplication and makes programs easier to extend.

Parent and Child Classes

// Parent class
class Person {
    String name;
    void displayName() {
        System.out.println(name);
    }
}

// Child class inherits from Person
class Student extends Person {
    int marks;
}

Class Diagram

Person ← parent / superclass (name, displayName()) ↑ | extends ("Student IS-A Person") | Student ← child / subclass (marks) + everything from Person

Using Inherited Members

public class Main {
    public static void main(String[] args) {
        Student s = new Student();
        s.name = "Kamal";    // inherited field
        s.marks = 80;        // own field
        s.displayName();     // inherited method
        System.out.println(s.marks);
    }
}

✅

Output: Kamal
80

📚 A.2 Terminology & Key Rules ▼

Term	Meaning	Example
Parent / Superclass	The class being inherited from	Person
Child / Subclass	The class that inherits	Student
extends	Keyword that creates the inheritance link	class Student extends Person
Inherited members	Fields/methods received from parent	name, displayName()
Overriding	Child provides own version of inherited method	Dog.sound()
super	Reference to parent part of object	super(name)
Is-a	Relationship justifying inheritance	Student is a Person

⚠️

Important Rules:

• A class can extend only one parent class (single inheritance).
• Inheritance can be multi-level: Person → Student → GraduateStudent.
• Every class secretly extends the built-in Object class.
• Don't use inheritance just to reuse code. Use it only when the is-a test is true.

📦 A.3 Inherited Members & What a Child Can Add ▼

A child object contains the parent's fields plus its own. The child may also add new methods.

class Person {
    String name;
    int age;
    void displayName() { System.out.println(name); }
}

class Student extends Person {
    int marks;            // new field
    boolean isPass() {    // new method
        return marks >= 40;
    }
}
// Student object has: name, age, marks
// Methods: displayName(), isPass()

⬆️ A.4 The super Keyword ▼

super refers to the parent class part of the current object. Two main uses:

Use 1: Call parent constructor

super(...) calls the parent constructor. Must be the first statement in the child constructor.

Use 2: Call parent method

super.method() calls the parent's version of a method that the child has overridden.

Example – Calling Parent Constructor

class Person {
    String name;
    Person(String name) {
        this.name = name;
        System.out.println("Person constructor");
    }
}

class Student extends Person {
    int marks;
    Student(String name, int marks) {
        super(name);   // MUST be first
        this.marks = marks;
        System.out.println("Student constructor");
    }
}

// new Student("Kamal", 80);
// Output:
// Person constructor
// Student constructor

🔑

Explanation: Creating a Student first builds the Person part (parent constructor runs first), then the Student part. super(name) passes the value up so the parent can initialize name.

Example – Calling Overridden Parent Method

class Student extends Person {
    int marks = 80;
    
    @Override
    void display() {
        super.display();                      // run Person's version first
        System.out.println("Marks: " + marks); // then add extra
    }
}

🏗️ A.5 Constructor Inheritance Rules ▼

🚨

Key Rule: Constructors are NOT inherited. A subclass must have its own constructors. However, every subclass constructor must call a parent constructor.

• super(...) must be the first statement in the child constructor.
• If you don't write it, the compiler inserts super(); automatically.
• If the parent has only a parameterised constructor, the child must call super(arguments) explicitly — otherwise a compile error occurs.
• Object creation order: parent constructor body runs before child constructor body.

class Person {
    String name;
    Person(String name) { // only parameterised
        this.name = name;
    }
}

class Student extends Person {
    int marks;
    Student(int marks) {     // ❌ ERROR: compiler tried super() but it doesn't exist
        this.marks = marks;
    }
}

// ✅ FIX:
class Student2 extends Person {
    int marks;
    Student2(String name, int marks) {
        super(name);   // explicit call, first line
        this.marks = marks;
    }
}

🔒 A.6 Member Accessibility: private, protected, public ▼

Access modifiers control who can see and use a class member. They support encapsulation (hiding data inside the class and exposing only what is necessary).

Modifier	Same Class	Same Package	Subclass	Everywhere
private	✅	❌	❌	❌
(default)	✅	✅	❌	❌
protected	✅	✅	✅	❌
public	✅	✅	✅	✅

✅

Best Practice: Make fields private and provide public getters/setters. This is the core of encapsulation.

🔄 A.7 Method Overriding vs Overloading ▼

Overriding means a subclass provides its own implementation of an inherited method, with the same name, parameters, and compatible return type. Use @Override to let the compiler check.

Aspect	Overloading	Overriding
Location	Same class	Subclass
Signature	Same name, different parameters	Same name AND parameters
Resolution	Compile time	Run time
Example	add(int,int) and add(double,double)	Dog.sound() replaces Animal.sound()

⚠️

Rules: Overriding method cannot have weaker access. final, static, and private methods cannot be overridden.

🎭 A.8 Polymorphism – "Many Forms" ▼

Polymorphism means the same method call can produce different behaviour depending on the actual object. It combines inheritance + method overriding + a parent-type reference.

Classic Example

class Animal { void sound() { System.out.println("Animal sound"); } }
class Dog extends Animal { @Override void sound() { System.out.println("Bark"); } }
class Cat extends Animal { @Override void sound() { System.out.println("Meow"); } }

// Using polymorphism
Animal a;
a = new Dog();
a.sound();   // Bark

a = new Cat();
a.sound();   // Meow

Polymorphism with an Array

Animal[] zoo = { new Dog(), new Cat(), new Animal(), new Dog() };
for (Animal x : zoo) {
    x.sound();   // one line, different behaviour per object
}
// Output: Bark, Meow, Animal sound, Bark

⚡ A.9 Runtime Polymorphism (Dynamic Method Dispatch) ▼

The JVM decides at run time (not compile time) which overridden method to execute — based on the actual object type, not the reference type.

Reference Object in memory Method that RUNS ---------------------------------------------- Animal a; a = new Dog(); a → [ Dog object ] → Dog.sound() "Bark" a = new Cat(); a → [ Cat object ] → Cat.sound() "Meow"

🎯

Key Rules:

• Reference type decides which methods you can call (compile-time check).
• Object type decides which overridden method runs (run-time decision).
• To call a child-only method through a parent reference, use instanceof then cast.

Safe Downcasting with instanceof

Animal a = new Dog();
if (a instanceof Dog) {
    Dog d = (Dog) a;   // downcast
    d.fetch();        // OK: fetch() is Dog-only
}

🧠 CLASS 4 – PART B: Standard Algorithms

🎯 Algorithm Strategies Overview ▼

An algorithm is a finite, step-by-step method for solving a problem. Four strategies appear repeatedly in computer science:

Strategy	Idea	Seen In
Brute Force	Try every possibility	String matching
Greedy	Take the best-looking choice now, never reconsider	Coins, Huffman, Activity Selection, SJF
Dynamic Programming	Solve sub-problems once, reuse answers	0/1 Knapsack
Divide & Conquer	Split, solve parts, combine	Binary Search, Fast Power

🔍 B.1 String Matching ▼

Finding whether a pattern occurs inside a text, and where. This powers search boxes, find-and-replace, and spell checkers.

Built-in String Methods

Method	Purpose
text.equals(other)	Are two strings identical?
text.equalsIgnoreCase()	Same, ignoring case
text.contains(p)	Does text contain p anywhere?
text.indexOf(p)	Position of first match, or -1
startsWith / endsWith	Match at start/end
charAt(i)	Character at index i

⚠️

Warning: Compare Strings with equals(), never == (which compares memory references, not content).

Brute Force Implementation

static int find(String text, String pattern) {
    for (int i = 0; i <= text.length() - pattern.length(); i++) {
        int j = 0;
        while (j < pattern.length() &&
               text.charAt(i + j) == pattern.charAt(j)) {
            j++;
        }
        if (j == pattern.length()) return i;
    }
    return -1;
}

🪙 B.2 Counting Coins (Greedy Approach) ▼

Problem: Make a given amount using the fewest coins.
Greedy: Always take the largest coin that still fits, subtract it, repeat.

Example: Amount = 37, Coins = 25, 10, 5, 1

37 - 25 = 12 (take 25) 12 - 10 = 2 (take 10) 2 - 1 = 1 (take 1) 1 - 1 = 0 (take 1) Result: 4 coins (25 + 10 + 1 + 1)

static void countCoins(int amount, int[] coins) {
    int totalCoins = 0;
    for (int coin : coins) {
        int howMany = amount / coin;
        if (howMany > 0) {
            System.out.println(howMany + " x " + coin);
            totalCoins += howMany;
            amount = amount % coin;
        }
    }
    System.out.println("Total coins = " + totalCoins);
}

⚠️

Key Point: Greedy is optimal only for some coin systems (25, 10, 5, 1). For coins {4, 3, 1} and amount 6, greedy gives 3 coins (4+1+1) but the optimal answer is 2 coins (3+3). When greedy fails, use Dynamic Programming.

🎒 B.3 Knapsack Problem (0/1 vs Fractional) ▼

Problem: A thief has a bag with limited capacity. Each item has weight and value. Goal: maximize total value without exceeding capacity.

Aspect	0/1 Knapsack	Fractional Knapsack
Rule	Take item whole or not at all	May take a fraction of an item
Method	Dynamic Programming	Greedy by value/weight ratio
Real-life	Laptops, boxes, tasks	Grain, liquids, sand

Fractional Knapsack (Greedy)

static double fractional(int[] wt, int[] val, int capacity) {
    // Sort by value/weight ratio (highest first)
    // Take items fully until bag is full
    // Take fraction of last item that fits
    double total = 0;
    int remaining = capacity;
    for (int i : sortedIndexes) {
        if (wt[i] <= remaining) {
            total += val[i];
            remaining -= wt[i];
        } else {
            total += val[i] * (double) remaining / wt[i];
            break;
        }
    }
    return total;
}

💡

Why Greedy Fails for 0/1: Choosing by ratio may leave unused capacity. 0/1 Knapsack requires Dynamic Programming: dp[i][w] = best value using first i items with capacity w.

🌳 B.4 Huffman Coding (Lossless Compression) ▼

A lossless data compression method that gives short bit codes to frequent characters and long codes to rare ones. No code is the beginning of another code (prefix code).

Frequency → Build tree (merge two lowest) → Assign 0/1 (left=0, right=1) → Compressed bits

Example: "ABRACADABRA"

Char	Frequency	Code	Bits used
A	5	0	5 × 1 = 5
B	2	10	2 × 2 = 4
R	2	110	2 × 3 = 6
C	1	1110	1 × 4 = 4
D	1	1111	1 × 4 = 4
Total	11	—	23 bits

✅

Result: Normal ASCII needs 11 × 8 = 88 bits. Huffman needs only 23 bits — over 70% savings!

📅 B.5 Activity Selection (Greedy) ▼

Given activities with start/finish times, choose the maximum number of non-overlapping activities.

🎯

Greedy Rule: Sort by earliest finish time, pick the first, then repeatedly pick the next activity whose start time is at or after the finish of the last chosen one.

Example

Activity	Start	Finish
A	1	3
B	2	5
C	4	7
D	6	8

// Already sorted by finish time
System.out.println("Selected: " + name[0]);  // A
int last = 0;
for (int i = 1; i < n; i++) {
    if (start[i] >= finish[last]) {
        System.out.println("Selected: " + name[i]);  // C
        last = i;
    }
}
// Output: Selected: A, Selected: C

⏰ B.6 Scheduling Strategies ▼

Scheduling decides which task runs when, given limited resources (CPUs, rooms, people).

Strategy	Rule	Notes
FCFS	Run in arrival order	Simple & fair; one long task delays everything
SJF	Shortest task first	Gives lowest average waiting time
Priority	Highest priority first	Low priority may starve (aging fixes this)
Round Robin	Time slice per task in turn	Used by time-sharing OS
EDF	Nearest deadline first	Used in real-time systems

Example: FCFS vs SJF

Strategy	Order	Waiting times	Average
FCFS	P1, P2, P3	0, 6, 14	6.67
SJF	P3, P1, P2	0, 3, 9	4.00

🚀 FINAL INTEGRATED PROJECT: Student Management System

🎓 Complete Student Management System ▼

This project combines inheritance, polymorphism, arrays, searching, sorting, methods, and loops into one real-world application.

System Architecture

Person (name, age, displayInfo()) ↑ | extends | Student (studentId, marks[], calculateTotal(), findGrade()) | Teacher (subject, overrides displayInfo())

Person.java (Parent Class)

public class Person {
    private String name;
    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() { return name; }
    public int getAge() { return age; }

    public void displayInfo() {
        System.out.println("Name: " + name + ", Age: " + age);
    }
}

Student.java (Child Class)

public class Student extends Person {
    private int studentId;
    private int[] marks;

    public Student(int id, String name, int age, int[] marks) {
        super(name, age);
        this.studentId = id;
        this.marks = marks;
    }

    public int calculateTotal() {
        int total = 0;
        for (int m : marks) total += m;
        return total;
    }

    public double calculateAverage() {
        return (double) calculateTotal() / marks.length;
    }

    public String findGrade() {
        double avg = calculateAverage();
        if (avg >= 75) return "A";
        else if (avg >= 65) return "B";
        else if (avg >= 55) return "C";
        else if (avg >= 40) return "D";
        else return "F";
    }

    @Override
    public void displayInfo() {
        super.displayInfo();
        System.out.println("  Student ID: " + studentId +
                           ", Grade: " + findGrade());
    }
}

Menu Operations Implemented

1. Add Student

Read from keyboard, store in Student[] array.

2. Display All

Formatted table of all students.

3. Class Average

Average of all students' averages.

4. Highest Total

Find top scorer.

5. Search by ID

Linear search implementation.

6. Sort by Total

Bubble sort on Student objects.

7. Pass/Fail

Display pass status of each student.

8. Polymorphism Demo

Person[] with Student + Teacher + Person.

Polymorphism in Action

Person[] people = {
    new Student(201, "Ruwan", 18, new int[]{60,70,80}),
    new Teacher("Mr. Silva", 40, "Java"),
    new Person("Visitor", 30)
};

for (Person p : people) {
    p.displayInfo();   // Each object runs ITS OWN version!
}

🏆

Why this project matters: It demonstrates every major Class 4 topic in one cohesive application — inheritance with super, encapsulation with private fields, arrays of objects, linear search, bubble sort, and runtime polymorphism.

📋 Quick Revision & Practice Questions

⚡ Quick Revision Checklist ▼

🧬 Inheritance

extends creates is-a relationship. Single parent only. Children inherit fields/methods.

⬆️ super

super(...) must be first line of child constructor. super.method() calls parent version.

🔒 Access

private = same class only. protected = subclasses + package. public = everywhere.

🔄 Override vs Overload

Override = same signature in subclass. Overload = same name, different parameters.

🎭 Polymorphism

Parent reference + child object. Real object's method runs at runtime.

🔍 String Matching

equals(), contains(), indexOf(), or brute-force character comparison.

🪙 Greedy

Coins, fractional knapsack, activity selection, Huffman, SJF. 0/1 needs DP.

🌳 Huffman

Merge two lowest frequencies. Left=0, right=1. Frequent chars get short codes.

✏️ Practice Questions (Click to reveal hints) ▼

1. Create Vehicle with speed and Car extends Vehicle with doors. Use super in constructor. ▼

💡 Call super(speed) as first line of Car constructor. Car constructor: Car(int speed, int doors) { super(speed); this.doors = doors; }

2. Why can Student not access private String name of Person directly? ▼

💡 private fields are hidden from subclasses. Access via a public getter: public String getName() { return name; }

3. Create Shape with area() and subclasses Circle, Rectangle. Use polymorphism. ▼

💡 Store in Shape[] shapes = {new Circle(5), new Rectangle(4,6)}; Loop with for (Shape s : shapes) s.area(); — each runs its own area()!

4. Difference between overloading and overriding (with examples). ▼

💡 Overloading: add(int,int) and add(double,double) in same class. Overriding: Dog.sound() replaces Animal.sound() in subclass.

5. Make change for 63 using coins 25, 10, 5, 1. Show where greedy fails. ▼

💡 63 = 25+25+10+1+1+1 (6 coins). Greedy fails with coins {4,3,1} for amount 6: gives 4+1+1 (3 coins), but optimal is 3+3 (2 coins).

6. Capacity 10; items (w,v): (5,10),(4,40),(6,30),(3,50). Solve fractional. ▼

💡 Sort by v/w: (3,50)→16.67, (4,40)→10, (5,10)→2, (6,30)→5. Take (3,50)=50, then (4,40)=40, then 3/5 of (5,10)=6. Total: 96.

7. Build Huffman tree for AABBBCCCC. Compute total bits. ▼

💡 Frequencies: A=2, B=3, C=4. Merge: A+B=5, then 5+C(4)=9. Assign codes. Total bits ≈ 17 (vs ASCII 72).

8. Activities (start,finish): (1,4),(3,5),(0,6),(5,7),(8,9),(5,9). Select max compatible set. ▼

💡 Sort by finish: (1,4),(3,5),(0,6),(5,7),(8,9),(5,9). Pick (1,4), then (5,7), then (8,9). Result: 3 activities.

9. Add a method to the project that prints only failed students. ▼

💡 for (int i = 0; i < count; i++) if (!students[i].isPass()) students[i].displayStudent();

☕ Java Class 4 — Master Notes Complete!

You've covered Inheritance, Polymorphism, Standard Algorithms, and built a complete Student Management System.
Practice the integrated project to solidify all OOP concepts for the exam! 🚀

🎓 SRI LANKA ONLINE ICT CLASSES · ශ්‍රී ලංකා ඔන්ලයින් ICT පන්ති · இலங்கை ஆன்லைன் ICT வகுப்புகள்

Online ICT Classes in Sri Lanka – O/L, A/L, Cambridge, Edexcel, Python, Web Development & Digital Marketing

Island-wide online classes and home-visit classes in English, Sinhala (සිංහල) and Tamil (தமிழ்) – for school students, university students, BIT / BSc / IT final-year project students, beginners and business owners.

💬 WhatsApp Us Now ▶ Watch Free Tutorials

What is ITClassSL? ITClassSL is a Sri Lankan ICT training service offering online and home-visit classes for G.C.E. O/L ICT, G.C.E. A/L ICT, Cambridge IGCSE / A Level, Pearson Edexcel, Python, Java, PHP & MySQL, web design, Microsoft Office, university and BIT final-year project guidance, and digital marketing. Classes run in English, Sinhala and Tamil, as individual or group sessions, anywhere in Sri Lanka. Contact: WhatsApp +94 72 962 2034 · itclasssl@gmail.com.

🚀 Learn Today. Build Tomorrow.

Looking for ICT classes in Sri Lanka, online ICT tuition, A/L ICT online class, computer classes near me or BIT project help? We provide practical, exam-focused and career-focused IT training with past papers, model papers, step-by-step coding and one-to-one support.

💡 Our ICT Training & Services in Sri Lanka

🏫 School ICT Classes (Grade 1 – 13)

Online and home-visit ICT lessons for Sri Lankan school students.

• G.C.E. O/L ICT (සාමාන්‍ය පෙළ ICT / சாதாரண தர ICT)
• G.C.E. A/L ICT (උසස් පෙළ ICT / உயர்தர ICT)
• GIT (General Information Technology)
• Term test papers, past papers & revision

🤖 Programming & AI

Learn to code from zero to project level.

• Python, C, Java, PHP, JavaScript
• HTML, CSS, jQuery & AJAX
• AI & machine-learning basics
• Problem solving & algorithms

🎓 University & Final-Year Project Guidance

Technical guidance for BIT, BSc, IT and ICT students.

• BIT / UCSC / UoM final-year projects
• PHP & MySQL, Python, Java projects
• Project ideas, proposal & documentation
• System design & database design

🌐 Web Design & Development

Websites and database-driven applications for individuals and businesses.

• Website design & development
• WordPress & Blogger
• PHP & MySQL web applications
• Website SEO & maintenance

📢 Digital Marketing

Grow your brand online in the Sri Lankan market.

• Facebook page & Facebook Ads
• Instagram, Reels, TikTok & YouTube
• SEO & content creation
• LinkedIn branding & campaign planning

💻 Computer & IT Skills

Essential computer skills from beginner to advanced.

• Computer fundamentals
• MS Word, Excel & PowerPoint
• Excel formulas & macros
• Oracle / MySQL / MS SQL, AWS, Linux

🗣️ English · සිංහල · தமிழ் – Classes in Your Language

English

Online ICT classes in Sri Lanka, A/L ICT online class, O/L ICT tuition, computer classes, Python classes, web design course, BIT project guidance, digital marketing course Sri Lanka, home visit ICT teacher, Cambridge & Edexcel ICT / Computer Science.

සිංහල

ශ්‍රී ලංකාවේ ඔන්ලයින් ICT පන්ති, උසස් පෙළ ICT ඔන්ලයින් පන්ති, සාමාන්‍ය පෙළ ICT පන්ති, පරිගණක පන්ති, පයිතන් (Python) ප්‍රෝග්‍රැමින් පන්ති, වෙබ් අඩවි නිර්මාණය, විශ්වවිද්‍යාල අවසන් වසර ව්‍යාපෘති මාර්ගෝපදේශනය, ඩිජිටල් මාකටින් පාඨමාලාව, නිවසට පැමිණ උගන්වන ICT ගුරුවරයා.

தமிழ்

இலங்கையில் ஆன்லைன் ICT வகுப்புகள், உயர்தர ICT ஆன்லைன் வகுப்பு, சாதாரண தர ICT வகுப்பு, கணினி வகுப்புகள், பைதான் (Python) நிரலாக்க வகுப்பு, இணையதள வடிவமைப்பு, பல்கலைக்கழக இறுதியாண்டு திட்ட வழிகாட்டல், டிஜிட்டல் மார்க்கெட்டிங் பயிற்சி, வீட்டிற்கு வந்து கற்பிக்கும் ICT ஆசிரியர்.

📚 Learn With Your Curriculum

Sri Lankan local syllabus, Pearson Edexcel and Cambridge programmes – ICT and Computer Science.

🇱🇰 Sri Lankan Local Curriculum

• Grade 1 – Grade 11 ICT
• G.C.E. O/L ICT · සා/පෙළ ICT · சா/த ICT
• G.C.E. A/L ICT · උ/පෙළ ICT · உ/த ICT
• GIT classes
• Term test preparation, model papers & notes
• English / Sinhala / Tamil medium

📘 Pearson Edexcel

• iPrimary Computing
• iLowerSecondary Computing
• International GCSE ICT
• International GCSE Computer Science
• International A Level IT
• International A Level Computer Science

📗 Cambridge

• Cambridge Primary & Lower Secondary Computing
• Cambridge IGCSE ICT
• Cambridge IGCSE Computer Science
• Cambridge O Level Computer Science
• AS & A Level IT
• AS & A Level Computer Science

💻 Programming & Software Development Classes

Python ProgrammingC ProgrammingJava Programming PHPJavaScriptHTML & CSS jQuery & AJAXASP.NETVB.NET VB6MySQLMS SQL Server MS AccessOracle DatabaseDatabase Design SQL QueriesSoftware DevelopmentSoftware Testing

🎓 BIT, BSc & University Final-Year IT Project Guidance

🧑‍💻 Project Development

• BIT / BSc / IT / ICT projects
• PHP & MySQL projects
• Python & Java projects
• Web application & database projects

📄 Documentation & Practical

• Project ideas & proposals
• System architecture & database design
• Assignment guidance
• Technical documentation & viva preparation

🧠 AI & Smart Applications

• AI application concepts
• Machine-learning modules
• Automation applications
• Step-by-step coding support

📊 Database, Cloud & IT Professional Training

Oracle DatabaseMySQLMicrosoft SQL Server Microsoft AccessAWS CloudLinux UNIXWindows ServerDevOps SREAutomationFreelancing Skills

📱 Digital Marketing & Social Media Training (ඩිජිටල් මාකටින් · டிஜிட்டல் மார்க்கெட்டிங்)

Facebook Page SetupFacebook AdsInstagram Marketing Instagram ReelsTikTok MarketingYouTube Channel Setup Social Media ManagementContent CreationSEO LinkedIn BrandingCampaign PlanningHashtag Strategy Insights & Engagement

🖥️ Microsoft Office & Digital Skills (පරිගණක පන්ති · கணினி வகுப்புகள்)

MS WordMS ExcelMS PowerPoint Excel FormulasExcel Macros & AutomationComputer Fundamentals Digital LiteracyMultimedia Presentations

🧭 How to Join – 4 Simple Steps

1. Message us on WhatsApp – tell us your grade / course, medium (English, Sinhala or Tamil) and your goal.
2. Choose your format – online class (island-wide), home-visit class, individual or small group.
3. Get your plan – schedule, syllabus coverage, notes, past papers or project roadmap.
4. Start learning – live practical sessions with support between classes.

⭐ Why Join Our ICT Classes?

🌍 Online & Home Visit
Study from anywhere in Sri Lanka or at home.

👥 Individual & Group
One-to-one or small group classes.

🗣️ English / සිංහල / தமிழ்
Learn in the medium you are comfortable with.

📚 School & University
O/L, A/L, Cambridge, Edexcel, BIT, BSc.

📝 Past & Model Papers
Exam-focused practice and revision.

💻 Practical Coding
Build real programs, websites and projects.

❓ Frequently Asked Questions – ICT Classes in Sri Lanka

Do you conduct online ICT classes for O/L and A/L students in Sri Lanka?

Yes. We conduct online ICT classes for G.C.E. O/L and A/L students island-wide, and also offer home-visit individual classes. Classes cover the syllabus, past papers, model papers and revision.

Which languages are the classes taught in? (සිංහල / தமிழ் / English)

Classes are available in English, Sinhala and Tamil medium. / පන්ති ඉංග්‍රීසි, සිංහල සහ දෙමළ මාධ්‍යයෙන් පවතී. / வகுப்புகள் ஆங்கிலம், சிங்களம் மற்றும் தமிழ் மொழிகளில் நடைபெறும்.

Do you teach Cambridge and Pearson Edexcel ICT and Computer Science?

Yes. We support Cambridge Primary to A Level and Pearson Edexcel iPrimary to International A Level, including IGCSE ICT, IGCSE Computer Science and O Level Computer Science.

Can you help with BIT, BSc or IT final-year projects?

Yes. We give technical guidance on project ideas, system design, database design, PHP & MySQL, Python and Java development, and documentation for BIT, BSc, IT and ICT students.

Can I learn Python, PHP, web design or digital marketing as a complete beginner?

Yes. Courses start from absolute beginner level and move step by step to practical projects. No previous experience is needed.

What are the class fees and schedules?

Fees and timetables depend on the subject, grade and whether you choose individual or group classes. Message us on WhatsApp (+94 72 962 2034) for current details.

How can I contact ITClassSL?

WhatsApp or call +94 72 962 2034, email itclasssl@gmail.com, or message us on Facebook and the other platforms listed below.

📞 Ready to Start Learning?

Book your online ICT class or ask about programming courses, university project guidance and digital marketing training.

📱 Call / WhatsApp: +94 72 962 2034

📧 Email: itclasssl@gmail.com

💻 Skype: ITClassSL

💬 Contact Us on WhatsApp

🌐 Our Online Learning Platforms

Tutorials, notes, project guides and learning resources.

📺 YouTube Tutorials
ICT & programming videos 💬 WhatsApp Community
Join our learning community ✍️ ICT Blog
Computer classes and tutorials 📰 WordPress
Notes and learning resources 📘 Facebook
Follow our official page 🌐 Wix Website
Our training services 💻 eTeacher Website
Online learning platform 📝 Medium
Technology articles ❓ Quora
Project guidance and Q&A 🎓 Strikingly Portfolio
University project resources 🗣️ ElaKiri Forum
Project discussion 🎵 TikTok
Short learning videos 🛒 Payhip
Digital resources 🌐 Weebly
Project and IT resources

ITClassSL — ICT Training | Computer Classes | Programming | University Project Guidance | Digital Marketing

Learn • Practice • Build • Grow 🚀

Popular searches: online ICT classes Sri Lanka · A/L ICT online class · O/L ICT tuition · Cambridge IGCSE ICT Sri Lanka · Edexcel Computer Science Sri Lanka · BIT final year project help · PHP MySQL project guidance · Python classes Sri Lanka · web design course Sri Lanka · digital marketing course Sri Lanka · home visit ICT teacher
සිංහල: ඔන්ලයින් ICT පන්ති · උසස් පෙළ ICT · සාමාන්‍ය පෙළ ICT · පරිගණක පන්ති · ව්‍යාපෘති මාර්ගෝපදේශනය · ඩිජිටල් මාකටින්
தமிழ்: ஆன்லைன் ICT வகுப்புகள் · உயர்தர ICT · சாதாரண தர ICT · கணினி வகுப்புகள் · திட்ட வழிகாட்டல் · டிஜிட்டல் மார்க்கெட்டிங்