From 2f4beade3bd23e776423c4eefb85bed9c37dd1cd Mon Sep 17 00:00:00 2001
From: Manoj HV <hvmanoj2@gmail.com>
Date: Wed, 17 Dec 2025 16:36:20 +0530
Subject: [PATCH] Added Java lab programs

---
 BankProject/BankDemo.class          | Bin 0 -> 1742 bytes
 BankProject/BankDemo.java           |  39 ++++++++
 BankProject/accounts/Account.class  | Bin 0 -> 1591 bytes
 BankProject/accounts/Account.java   |  38 ++++++++
 BankProject/services/Interest.class | Bin 0 -> 320 bytes
 BankProject/services/Interest.java  |  10 +++
 Buffer.class                        | Bin 0 -> 1320 bytes
 Car.class                           | Bin 0 -> 426 bytes
 CircleOps.class                     | Bin 0 -> 153 bytes
 Consumer.class                      | Bin 0 -> 631 bytes
 CreditCardPayment.class             | Bin 0 -> 314 bytes
 Employee.class                      | Bin 0 -> 1250 bytes
 EmployeeDatabase.class              | Bin 0 -> 2012 bytes
 EmployeeRecruitment.class           | Bin 0 -> 1533 bytes
 EmployeeRecruitment.java            |  67 ++++++++++++++
 Ford.class                          | Bin 0 -> 404 bytes
 MyOwnAutoShop.class                 | Bin 0 -> 2015 bytes
 MyOwnAutoShop.java                  | 134 ++++++++++++++++++++++++++++
 NetBankingPayment.class             | Bin 0 -> 314 bytes
 OnlinePaymentSystem.class           | Bin 0 -> 1643 bytes
 OnlinePaymentSystem.java            |  94 +++++++++++++++++++
 Payment.class                       | Bin 0 -> 317 bytes
 Producer.class                      | Bin 0 -> 644 bytes
 ProducerConsumerDemo.class          | Bin 0 -> 436 bytes
 ProducerConsumerDemo.java           |  97 ++++++++++++++++++++
 RectangleOps.class                  | Bin 0 -> 162 bytes
 Sedan.class                         | Bin 0 -> 437 bytes
 ShapeBase.class                     | Bin 0 -> 249 bytes
 ShapeCalculator.class               | Bin 0 -> 1526 bytes
 ShapeOps.class                      | Bin 0 -> 167 bytes
 ShapesDemo.class                    | Bin 0 -> 1919 bytes
 ShapesDemo.java                     | 107 ++++++++++++++++++++++
 Student.class                       | Bin 0 -> 1388 bytes
 TextHelper.class                    | Bin 0 -> 2206 bytes
 TextProcessingHelper.class          | Bin 0 -> 1743 bytes
 TextProcessingHelper.java           | 121 +++++++++++++++++++++++++
 TooOlder.class                      | Bin 0 -> 227 bytes
 TooYounger.class                    | Bin 0 -> 229 bytes
 Truck.class                         | Bin 0 -> 438 bytes
 UPIPayment.class                    | Bin 0 -> 302 bytes
 UniversityEnrollment.class          | Bin 0 -> 1425 bytes
 UniversityEnrollment.java           |  65 ++++++++++++++
 point/MyPoint.class                 | Bin 0 -> 1287 bytes
 point/MyPoint.java                  |  53 +++++++++++
 point/TestMyPoint.class             | Bin 0 -> 2078 bytes
 point/TestMyPoint.java              |  57 ++++++++++++
 46 files changed, 882 insertions(+)
 create mode 100644 BankProject/BankDemo.class
 create mode 100644 BankProject/BankDemo.java
 create mode 100644 BankProject/accounts/Account.class
 create mode 100644 BankProject/accounts/Account.java
 create mode 100644 BankProject/services/Interest.class
 create mode 100644 BankProject/services/Interest.java
 create mode 100644 Buffer.class
 create mode 100644 Car.class
 create mode 100644 CircleOps.class
 create mode 100644 Consumer.class
 create mode 100644 CreditCardPayment.class
 create mode 100644 Employee.class
 create mode 100644 EmployeeDatabase.class
 create mode 100644 EmployeeRecruitment.class
 create mode 100644 EmployeeRecruitment.java
 create mode 100644 Ford.class
 create mode 100644 MyOwnAutoShop.class
 create mode 100644 MyOwnAutoShop.java
 create mode 100644 NetBankingPayment.class
 create mode 100644 OnlinePaymentSystem.class
 create mode 100644 OnlinePaymentSystem.java
 create mode 100644 Payment.class
 create mode 100644 Producer.class
 create mode 100644 ProducerConsumerDemo.class
 create mode 100644 ProducerConsumerDemo.java
 create mode 100644 RectangleOps.class
 create mode 100644 Sedan.class
 create mode 100644 ShapeBase.class
 create mode 100644 ShapeCalculator.class
 create mode 100644 ShapeOps.class
 create mode 100644 ShapesDemo.class
 create mode 100644 ShapesDemo.java
 create mode 100644 Student.class
 create mode 100644 TextHelper.class
 create mode 100644 TextProcessingHelper.class
 create mode 100644 TextProcessingHelper.java
 create mode 100644 TooOlder.class
 create mode 100644 TooYounger.class
 create mode 100644 Truck.class
 create mode 100644 UPIPayment.class
 create mode 100644 UniversityEnrollment.class
 create mode 100644 UniversityEnrollment.java
 create mode 100644 point/MyPoint.class
 create mode 100644 point/MyPoint.java
 create mode 100644 point/TestMyPoint.class
 create mode 100644 point/TestMyPoint.java

diff --git a/BankProject/BankDemo.class b/BankProject/BankDemo.class
new file mode 100644
index 0000000000000000000000000000000000000000..f0218551fdf901e3f267fe0f76ee40438863f343
GIT binary patch
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HcmV?d00001

diff --git a/BankProject/BankDemo.java b/BankProject/BankDemo.java
new file mode 100644
index 0000000..b570619
--- /dev/null
+++ b/BankProject/BankDemo.java
@@ -0,0 +1,39 @@
+import accounts.Account;
+import java.util.Scanner;
+import services.Interest;
+
+public class BankDemo {
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        System.out.print("Enter Account Number: ");
+        int accNo = sc.nextInt();
+        sc.nextLine();
+
+        System.out.print("Enter Customer Name: ");
+        String name = sc.nextLine();
+
+        System.out.print("Enter Initial Balance: ");
+        double balance = sc.nextDouble();
+
+        Account acc = new Account(accNo, name, balance);
+
+        System.out.print("Enter amount to deposit: ");
+        double dep = sc.nextDouble();
+        acc.deposit(dep);
+
+        System.out.print("Enter amount to withdraw: ");
+        double wd = sc.nextDouble();
+        acc.withdraw(wd);
+
+        Interest interest = new Interest();
+        double updatedBalance = interest.applyInterest(acc.getBalance());
+
+        System.out.println("\n--- Account Details After Interest ---");
+        acc.displayAccountDetails();
+        System.out.println("Balance after interest: " + updatedBalance);
+
+        sc.close();
+    }
+}
diff --git a/BankProject/accounts/Account.class b/BankProject/accounts/Account.class
new file mode 100644
index 0000000000000000000000000000000000000000..d63f13dc7f5f16a755d7ed9ccd5a81e7d02a91ce
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/BankProject/accounts/Account.java b/BankProject/accounts/Account.java
new file mode 100644
index 0000000..0348fd6
--- /dev/null
+++ b/BankProject/accounts/Account.java
@@ -0,0 +1,38 @@
+package accounts;
+
+public class Account {
+
+    private int accountNumber;
+    private String customerName;
+    private double balance;
+
+    public Account(int accountNumber, String customerName, double balance) {
+        this.accountNumber = accountNumber;
+        this.customerName = customerName;
+        this.balance = balance;
+    }
+
+    public void deposit(double amount) {
+        balance += amount;
+        System.out.println("Amount deposited: " + amount);
+    }
+
+    public void withdraw(double amount) {
+        if (amount <= balance) {
+            balance -= amount;
+            System.out.println("Amount withdrawn: " + amount);
+        } else {
+            System.out.println("Insufficient balance!");
+        }
+    }
+
+    public double getBalance() {
+        return balance;
+    }
+
+    public void displayAccountDetails() {
+        System.out.println("Account Number: " + accountNumber);
+        System.out.println("Customer Name: " + customerName);
+        System.out.println("Balance: " + balance);
+    }
+}
diff --git a/BankProject/services/Interest.class b/BankProject/services/Interest.class
new file mode 100644
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GIT binary patch
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HcmV?d00001

diff --git a/BankProject/services/Interest.java b/BankProject/services/Interest.java
new file mode 100644
index 0000000..ed8ba83
--- /dev/null
+++ b/BankProject/services/Interest.java
@@ -0,0 +1,10 @@
+package services;
+
+public class Interest {
+
+    private static final double RATE = 0.05; // 5% interest
+
+    public double applyInterest(double balance) {
+        return balance + (balance * RATE);
+    }
+}
diff --git a/Buffer.class b/Buffer.class
new file mode 100644
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GIT binary patch
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diff --git a/Car.class b/Car.class
new file mode 100644
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GIT binary patch
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diff --git a/CircleOps.class b/CircleOps.class
new file mode 100644
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GIT binary patch
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diff --git a/Consumer.class b/Consumer.class
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GIT binary patch
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diff --git a/CreditCardPayment.class b/CreditCardPayment.class
new file mode 100644
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GIT binary patch
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diff --git a/Employee.class b/Employee.class
new file mode 100644
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GIT binary patch
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HcmV?d00001

diff --git a/EmployeeDatabase.class b/EmployeeDatabase.class
new file mode 100644
index 0000000000000000000000000000000000000000..04e198b36b1524a79ae991551f7c92028d2b9298
GIT binary patch
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diff --git a/EmployeeRecruitment.class b/EmployeeRecruitment.class
new file mode 100644
index 0000000000000000000000000000000000000000..5a1167cbb1ff32b29b16646d7951b7a3eca97002
GIT binary patch
literal 1533
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literal 0
HcmV?d00001

diff --git a/EmployeeRecruitment.java b/EmployeeRecruitment.java
new file mode 100644
index 0000000..ccf4a59
--- /dev/null
+++ b/EmployeeRecruitment.java
@@ -0,0 +1,67 @@
+import java.util.Scanner;
+
+// -------- User-defined exception: TooOlder --------
+class TooOlder extends Exception {
+
+    public TooOlder(String message) {
+        super(message);
+    }
+}
+
+// -------- User-defined exception: TooYounger --------
+class TooYounger extends Exception {
+
+    public TooYounger(String message) {
+        super(message);
+    }
+}
+
+// -------- Employee class --------
+class Employee {
+
+    String name;
+    int age;
+
+    Employee(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    // Method to validate age eligibility
+    void validateAge() throws TooOlder, TooYounger {
+        if (age > 45) {
+            throw new TooOlder("Candidate is too old for recruitment");
+        } else if (age < 18) {
+            throw new TooYounger("Candidate is too young for recruitment");
+        } else {
+            System.out.println("Eligible");
+            System.out.println("Candidate Name: " + name);
+        }
+    }
+}
+
+// -------- Main class --------
+public class EmployeeRecruitment {
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        System.out.print("Enter Candidate Name: ");
+        String name = sc.nextLine();
+
+        System.out.print("Enter Candidate Age: ");
+        int age = sc.nextInt();
+
+        Employee emp = new Employee(name, age);
+
+        try {
+            emp.validateAge();
+        } catch (TooOlder e) {
+            System.out.println("Exception: " + e.getMessage());
+        } catch (TooYounger e) {
+            System.out.println("Exception: " + e.getMessage());
+        }
+
+        sc.close();
+    }
+}
diff --git a/Ford.class b/Ford.class
new file mode 100644
index 0000000000000000000000000000000000000000..fe83e6387390d8c07c2b38443205b46764491979
GIT binary patch
literal 404
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literal 0
HcmV?d00001

diff --git a/MyOwnAutoShop.class b/MyOwnAutoShop.class
new file mode 100644
index 0000000000000000000000000000000000000000..eb97759a53b9e4966222d111753e3c004c5adf41
GIT binary patch
literal 2015
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literal 0
HcmV?d00001

diff --git a/MyOwnAutoShop.java b/MyOwnAutoShop.java
new file mode 100644
index 0000000..c1ee8bc
--- /dev/null
+++ b/MyOwnAutoShop.java
@@ -0,0 +1,134 @@
+import java.util.Scanner;
+
+// ---------- SUPER CLASS ----------
+class Car {
+
+    int speed;
+    double regularPrice;
+    String color;
+
+    Car(int speed, double regularPrice, String color) {
+        this.speed = speed;
+        this.regularPrice = regularPrice;
+        this.color = color;
+    }
+
+    double getSalePrice() {
+        return regularPrice;
+    }
+}
+
+// ---------- SUB CLASS : TRUCK ----------
+class Truck extends Car {
+
+    int weight;
+
+    Truck(int speed, double regularPrice, String color, int weight) {
+        super(speed, regularPrice, color);
+        this.weight = weight;
+    }
+
+    double getSalePrice() {
+        if (weight > 2000) return regularPrice * 0.90;
+        // 10% discount
+        else return regularPrice * 0.80; // 20% discount
+    }
+}
+
+// ---------- SUB CLASS : FORD ----------
+class Ford extends Car {
+
+    int year;
+    int manufacturerDiscount;
+
+    Ford(
+        int speed,
+        double regularPrice,
+        String color,
+        int year,
+        int manufacturerDiscount
+    ) {
+        super(speed, regularPrice, color);
+        this.year = year;
+        this.manufacturerDiscount = manufacturerDiscount;
+    }
+
+    double getSalePrice() {
+        return super.getSalePrice() - manufacturerDiscount;
+    }
+}
+
+// ---------- SUB CLASS : SEDAN ----------
+class Sedan extends Car {
+
+    int length;
+
+    Sedan(int speed, double regularPrice, String color, int length) {
+        super(speed, regularPrice, color);
+        this.length = length;
+    }
+
+    double getSalePrice() {
+        if (length > 20) return regularPrice * 0.95;
+        // 5% discount
+        else return regularPrice * 0.90; // 10% discount
+    }
+}
+
+// ---------- MAIN CLASS ----------
+public class MyOwnAutoShop {
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        // ---- Sedan Object ----
+        System.out.println("Enter Sedan details:");
+        System.out.print("Speed: ");
+        int sSpeed = sc.nextInt();
+        System.out.print("Regular Price: ");
+        double sPrice = sc.nextDouble();
+        sc.nextLine();
+        System.out.print("Color: ");
+        String sColor = sc.nextLine();
+        System.out.print("Length: ");
+        int sLength = sc.nextInt();
+
+        Sedan sedan = new Sedan(sSpeed, sPrice, sColor, sLength);
+
+        // ---- Ford Object ----
+        System.out.println("\nEnter Ford details:");
+        System.out.print("Speed: ");
+        int fSpeed = sc.nextInt();
+        System.out.print("Regular Price: ");
+        double fPrice = sc.nextDouble();
+        sc.nextLine();
+        System.out.print("Color: ");
+        String fColor = sc.nextLine();
+        System.out.print("Year: ");
+        int fYear = sc.nextInt();
+        System.out.print("Manufacturer Discount: ");
+        int fDiscount = sc.nextInt();
+
+        Ford ford = new Ford(fSpeed, fPrice, fColor, fYear, fDiscount);
+
+        // ---- Car Object ----
+        System.out.println("\nEnter Car details:");
+        System.out.print("Speed: ");
+        int cSpeed = sc.nextInt();
+        System.out.print("Regular Price: ");
+        double cPrice = sc.nextDouble();
+        sc.nextLine();
+        System.out.print("Color: ");
+        String cColor = sc.nextLine();
+
+        Car car = new Car(cSpeed, cPrice, cColor);
+
+        // ---- Display Sale Prices ----
+        System.out.println("\n--- Sale Prices ---");
+        System.out.println("Sedan Sale Price: " + sedan.getSalePrice());
+        System.out.println("Ford Sale Price: " + ford.getSalePrice());
+        System.out.println("Car Sale Price: " + car.getSalePrice());
+
+        sc.close();
+    }
+}
diff --git a/NetBankingPayment.class b/NetBankingPayment.class
new file mode 100644
index 0000000000000000000000000000000000000000..7af98d814e4f838f92c98a04eec2a908e737d45f
GIT binary patch
literal 314
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literal 0
HcmV?d00001

diff --git a/OnlinePaymentSystem.class b/OnlinePaymentSystem.class
new file mode 100644
index 0000000000000000000000000000000000000000..0e56e6aaa810876f844c34fa30459fcf6a4e2bd8
GIT binary patch
literal 1643
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literal 0
HcmV?d00001

diff --git a/OnlinePaymentSystem.java b/OnlinePaymentSystem.java
new file mode 100644
index 0000000..7efa8a3
--- /dev/null
+++ b/OnlinePaymentSystem.java
@@ -0,0 +1,94 @@
+import java.util.Scanner;
+
+// -------- BASE CLASS --------
+class Payment {
+
+    double amount;
+
+    Payment(double amount) {
+        this.amount = amount;
+    }
+
+    double processPayment() {
+        return amount;
+    }
+}
+
+// -------- SUB CLASS : CREDIT CARD --------
+class CreditCardPayment extends Payment {
+
+    CreditCardPayment(double amount) {
+        super(amount);
+    }
+
+    double processPayment() {
+        return amount + (amount * 0.02); // 2% service charge
+    }
+}
+
+// -------- SUB CLASS : UPI --------
+class UPIPayment extends Payment {
+
+    UPIPayment(double amount) {
+        super(amount);
+    }
+
+    double processPayment() {
+        return amount + 5; // Flat ₹5 charge
+    }
+}
+
+// -------- SUB CLASS : NET BANKING --------
+class NetBankingPayment extends Payment {
+
+    NetBankingPayment(double amount) {
+        super(amount);
+    }
+
+    double processPayment() {
+        return amount + (amount * 0.015); // 1.5% service charge
+    }
+}
+
+// -------- MAIN CLASS --------
+public class OnlinePaymentSystem {
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        System.out.print("Enter payment amount: ");
+        double amount = sc.nextDouble();
+
+        System.out.println("\nChoose Payment Method:");
+        System.out.println("1. Credit Card");
+        System.out.println("2. UPI");
+        System.out.println("3. Net Banking");
+        System.out.print("Enter choice: ");
+        int choice = sc.nextInt();
+
+        Payment payment; // Base class reference
+
+        switch (choice) {
+            case 1:
+                payment = new CreditCardPayment(amount);
+                break;
+            case 2:
+                payment = new UPIPayment(amount);
+                break;
+            case 3:
+                payment = new NetBankingPayment(amount);
+                break;
+            default:
+                System.out.println("Invalid choice");
+                sc.close();
+                return;
+        }
+
+        // Dynamic method dispatch
+        double finalAmount = payment.processPayment();
+
+        System.out.println("\nFinal Payable Amount: ₹" + finalAmount);
+
+        sc.close();
+    }
+}
diff --git a/Payment.class b/Payment.class
new file mode 100644
index 0000000000000000000000000000000000000000..826d2eda90e9d2b86fde094e0739e34ec44f0c21
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diff --git a/Producer.class b/Producer.class
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GIT binary patch
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diff --git a/ProducerConsumerDemo.class b/ProducerConsumerDemo.class
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HcmV?d00001

diff --git a/ProducerConsumerDemo.java b/ProducerConsumerDemo.java
new file mode 100644
index 0000000..8a1dadb
--- /dev/null
+++ b/ProducerConsumerDemo.java
@@ -0,0 +1,97 @@
+// -------- Shared Buffer Class --------
+class Buffer {
+
+    private int value;
+    private boolean hasValue = false;
+
+    // Producer puts value
+    synchronized void put(int value) {
+        while (hasValue) {
+            try {
+                wait(); // wait if buffer is full
+            } catch (InterruptedException e) {
+                System.out.println(e);
+            }
+        }
+
+        this.value = value;
+        hasValue = true;
+        System.out.println("Produced: " + value);
+
+        notify(); // notify consumer
+    }
+
+    // Consumer gets value
+    synchronized int get() {
+        while (!hasValue) {
+            try {
+                wait(); // wait if buffer is empty
+            } catch (InterruptedException e) {
+                System.out.println(e);
+            }
+        }
+
+        System.out.println("Consumed: " + value);
+        hasValue = false;
+
+        notify(); // notify producer
+        return value;
+    }
+}
+
+// -------- Producer Thread --------
+class Producer extends Thread {
+
+    Buffer buffer;
+
+    Producer(Buffer buffer) {
+        this.buffer = buffer;
+    }
+
+    public void run() {
+        int i = 1;
+        while (true) {
+            buffer.put(i++);
+            try {
+                Thread.sleep(500);
+            } catch (InterruptedException e) {
+                System.out.println(e);
+            }
+        }
+    }
+}
+
+// -------- Consumer Thread --------
+class Consumer extends Thread {
+
+    Buffer buffer;
+
+    Consumer(Buffer buffer) {
+        this.buffer = buffer;
+    }
+
+    public void run() {
+        while (true) {
+            buffer.get();
+            try {
+                Thread.sleep(500);
+            } catch (InterruptedException e) {
+                System.out.println(e);
+            }
+        }
+    }
+}
+
+// -------- Main Class --------
+public class ProducerConsumerDemo {
+
+    public static void main(String[] args) {
+        Buffer buffer = new Buffer();
+
+        Producer producer = new Producer(buffer);
+        Consumer consumer = new Consumer(buffer);
+
+        producer.start();
+        consumer.start();
+    }
+}
diff --git a/RectangleOps.class b/RectangleOps.class
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diff --git a/Sedan.class b/Sedan.class
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diff --git a/ShapeCalculator.class b/ShapeCalculator.class
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diff --git a/ShapeOps.class b/ShapeOps.class
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diff --git a/ShapesDemo.class b/ShapesDemo.class
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diff --git a/ShapesDemo.java b/ShapesDemo.java
new file mode 100644
index 0000000..2d86e90
--- /dev/null
+++ b/ShapesDemo.java
@@ -0,0 +1,107 @@
+import java.util.Scanner;
+
+// -------- Interface for Circle --------
+interface CircleOps {
+    double circleArea();
+    double circlePerimeter();
+}
+
+// -------- Interface for Rectangle --------
+interface RectangleOps {
+    double rectangleArea();
+    double rectanglePerimeter();
+}
+
+// -------- Interface inheriting both --------
+interface ShapeOps extends CircleOps, RectangleOps {
+    void displaySummary();
+}
+
+// -------- Base class --------
+class ShapeBase {
+
+    double radius;
+    double length;
+    double breadth;
+}
+
+// -------- Implementing class --------
+class ShapeCalculator extends ShapeBase implements ShapeOps {
+
+    ShapeCalculator(double radius, double length, double breadth) {
+        this.radius = radius;
+        this.length = length;
+        this.breadth = breadth;
+    }
+
+    // Circle operations
+    public double circleArea() {
+        return Math.PI * radius * radius;
+    }
+
+    public double circlePerimeter() {
+        return 2 * Math.PI * radius;
+    }
+
+    // Rectangle operations
+    public double rectangleArea() {
+        return length * breadth;
+    }
+
+    public double rectanglePerimeter() {
+        return 2 * (length + breadth);
+    }
+
+    // Summary method
+    public void displaySummary() {
+        System.out.println("\n--- Shape Summary ---");
+        System.out.println("Circle Area: " + circleArea());
+        System.out.println("Circle Perimeter: " + circlePerimeter());
+        System.out.println("Rectangle Area: " + rectangleArea());
+        System.out.println("Rectangle Perimeter: " + rectanglePerimeter());
+    }
+}
+
+// -------- Demo class --------
+public class ShapesDemo {
+
+    // Method accepting CircleOps
+    static void circleOperations(CircleOps c) {
+        System.out.println("\nCircle Area: " + c.circleArea());
+        System.out.println("Circle Perimeter: " + c.circlePerimeter());
+    }
+
+    // Method accepting RectangleOps
+    static void rectangleOperations(RectangleOps r) {
+        System.out.println("\nRectangle Area: " + r.rectangleArea());
+        System.out.println("Rectangle Perimeter: " + r.rectanglePerimeter());
+    }
+
+    // Method accepting ShapeOps
+    static void shapeOperations(ShapeOps s) {
+        s.displaySummary();
+    }
+
+    // -------- Main method --------
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        System.out.print("Enter radius of circle: ");
+        double radius = sc.nextDouble();
+
+        System.out.print("Enter length of rectangle: ");
+        double length = sc.nextDouble();
+
+        System.out.print("Enter breadth of rectangle: ");
+        double breadth = sc.nextDouble();
+
+        ShapeCalculator shape = new ShapeCalculator(radius, length, breadth);
+
+        // Polymorphism using interface references
+        circleOperations(shape);
+        rectangleOperations(shape);
+        shapeOperations(shape);
+
+        sc.close();
+    }
+}
diff --git a/Student.class b/Student.class
new file mode 100644
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diff --git a/TextHelper.class b/TextHelper.class
new file mode 100644
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GIT binary patch
literal 2206
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B8<qe7

literal 0
HcmV?d00001

diff --git a/TextProcessingHelper.class b/TextProcessingHelper.class
new file mode 100644
index 0000000000000000000000000000000000000000..ee3f0342a1ec74e17392082c015a18cef6e2664e
GIT binary patch
literal 1743
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z>bXzx6wk@^7lil))!<7Q_!=wt1_gW%i65|vpHRflu<#4k@hdj)8%p>CW&BAff1yG)
xeI%Mu6>X@A4s3}ywh09ofclz<L=~(kP!tsW|3Tny6h)8HGZa(E<5gcz@m~a?qxb*-

literal 0
HcmV?d00001

diff --git a/TextProcessingHelper.java b/TextProcessingHelper.java
new file mode 100644
index 0000000..7cea075
--- /dev/null
+++ b/TextProcessingHelper.java
@@ -0,0 +1,121 @@
+import java.util.Scanner;
+
+// -------- Helper Class --------
+class TextHelper {
+
+    private String text;
+    private String keyword;
+
+    TextHelper(String text, String keyword) {
+        this.text = text;
+        this.keyword = keyword;
+    }
+
+    // 1. View character at a position
+    void viewCharacter(int position) {
+        if (position >= 0 && position < text.length()) {
+            System.out.println(
+                "Character at position " +
+                    position +
+                    ": " +
+                    text.charAt(position)
+            );
+        } else {
+            System.out.println("Invalid position!");
+        }
+    }
+
+    // 2. Compare text and keyword
+    void compareText() {
+        int result = text.compareTo(keyword);
+
+        if (result == 0) System.out.println("Text and keyword are equal.");
+        else if (result < 0) System.out.println(
+            "Text comes before keyword alphabetically."
+        );
+        else System.out.println("Keyword comes before text alphabetically.");
+    }
+
+    // 3. Search & replace keyword
+    void searchAndReplace(String replacement) {
+        int index = text.indexOf(keyword);
+
+        if (index == -1) {
+            System.out.println("Keyword not found in text.");
+        } else {
+            System.out.println("Keyword first found at position: " + index);
+            text = text.replace(keyword, replacement);
+            System.out.println("Updated Text: " + text);
+        }
+    }
+
+    // 4. Extract substring
+    void extractPortion(int start, int end) {
+        if (start >= 0 && end <= text.length() && start < end) {
+            System.out.println("Extracted Text: " + text.substring(start, end));
+        } else {
+            System.out.println("Invalid start or end position!");
+        }
+    }
+}
+
+// -------- Main Class --------
+public class TextProcessingHelper {
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        System.out.print("Enter main text: ");
+        String text = sc.nextLine();
+
+        System.out.print("Enter keyword: ");
+        String keyword = sc.nextLine();
+
+        TextHelper helper = new TextHelper(text, keyword);
+
+        int choice;
+
+        do {
+            System.out.println("\n--- Text Processing Menu ---");
+            System.out.println("1. View character at a position");
+            System.out.println("2. Compare text and keyword");
+            System.out.println("3. Search and replace keyword");
+            System.out.println("4. Extract portion of text");
+            System.out.println("5. Exit");
+            System.out.print("Enter your choice: ");
+
+            choice = sc.nextInt();
+            sc.nextLine(); // consume newline
+
+            switch (choice) {
+                case 1:
+                    System.out.print("Enter position: ");
+                    int pos = sc.nextInt();
+                    helper.viewCharacter(pos);
+                    break;
+                case 2:
+                    helper.compareText();
+                    break;
+                case 3:
+                    System.out.print("Enter replacement word: ");
+                    String replacement = sc.nextLine();
+                    helper.searchAndReplace(replacement);
+                    break;
+                case 4:
+                    System.out.print("Enter start position: ");
+                    int start = sc.nextInt();
+                    System.out.print("Enter end position: ");
+                    int end = sc.nextInt();
+                    helper.extractPortion(start, end);
+                    break;
+                case 5:
+                    System.out.println("Exiting program...");
+                    break;
+                default:
+                    System.out.println("Invalid choice!");
+            }
+        } while (choice != 5);
+
+        sc.close();
+    }
+}
diff --git a/TooOlder.class b/TooOlder.class
new file mode 100644
index 0000000000000000000000000000000000000000..7a04c79d308b755b41d00b9675f4f3df44c5f57e
GIT binary patch
literal 227
zcmX^0Z`VEs1_nn4UM>bE24;2!79Ivx1~x_p;jF~6ME#t^ymWonisaOSlFa-(Mg}&U
z%)HDJJ4Oak4IhMp;F6-uymV{LFm?tGMh1?M{CxkMl++?d1{UZ1lvG9rexJ;|RKL>P
zq|~C2#H1Xc2v=}^X;E^jTPBDj;hI~JlV6#d8kCw`RGL|mo0?am2Qr;Ofq@<9DiB}<
sLZG{VBqxxk1QZ2{vuSB>XJFh2mgfSJAU`kw^{_H<09A4W*-Q*P07@<|h5!Hn

literal 0
HcmV?d00001

diff --git a/TooYounger.class b/TooYounger.class
new file mode 100644
index 0000000000000000000000000000000000000000..fec33963f99f96d720c0ef937c679522600e9639
GIT binary patch
literal 229
zcmX^0Z`VEs1_nn4UM>bE24;2!79Ivx1~x_p;jF~6ME#t^ymWonisaOSlFa-(Mg}&U
z%)HDJJ4Oak4IhMp;F6-uymV{LFm?tGMh32s{QSuL(!BK4B1Q%l=lqmZMh1SL%)C^;
z(%hufqL9R-9H0nSaDHh~a;jS<h$G>eTac4qnVK4unp{+xS(2NYSE2_ppFx3v9q29)
uU<5*-%YY;&kf#I`1&On1X>Vs>+z6KE0+JwKFfi}~RSE!Aas$~+3_Jk-Aux*o

literal 0
HcmV?d00001

diff --git a/Truck.class b/Truck.class
new file mode 100644
index 0000000000000000000000000000000000000000..5ec0c2530f7a7baf31afe0fcf60851397b2715ed
GIT binary patch
literal 438
zcmZuu(MkeA6g}hax@oIsW@#!!PwGQ{K#_<N2wK64@8h<t+itru>?VCmJ@+m_5%kap
zL_xn1^bOG+^RWwa=gggZ&fI(F?dRncKnJxn5>Rxg1~eoYlr9$x$s;##qhp4hdcQZg
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literal 0
HcmV?d00001

diff --git a/UPIPayment.class b/UPIPayment.class
new file mode 100644
index 0000000000000000000000000000000000000000..f4428ed3532caa151a7b345047de0ee812558ca4
GIT binary patch
literal 302
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literal 0
HcmV?d00001

diff --git a/UniversityEnrollment.class b/UniversityEnrollment.class
new file mode 100644
index 0000000000000000000000000000000000000000..0d943b473d11d2a52bf34bc39c5ce2374d9fd6bf
GIT binary patch
literal 1425
zcmaJ>%W@Mr6g_fmw_`d$9)<)6G!O<mJPgSYz~&W90?j1AOedizR*Ee`<F@4LmNR(I
zN3dtXjw)Cr6jbp6d<LJvf|;wfU6@J=SGlDt9i4mbL;CvT(-#2qSj{4V0SieRDWn<p
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z40)PY>&v{^#b-U$3aet#H-{&7b9UYokNWPmQaaKhZ!Qb{T-Bls?lBz7cG{sq*^8WK
zDs;N>IBZ`U_p|s5OBR+*wH{FK#C;Ig!<U<?E{dIUcM7=3t6GI^hS&WK(FJy#-s7?s
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z5i&;4rHpm1XQe-*_#~IirE=+QTr61=))xMJHNf8f_wFMu)1i_Pmx#qJVwmQqu?Gc=
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literal 0
HcmV?d00001

diff --git a/UniversityEnrollment.java b/UniversityEnrollment.java
new file mode 100644
index 0000000..81f50a0
--- /dev/null
+++ b/UniversityEnrollment.java
@@ -0,0 +1,65 @@
+import java.util.Scanner;
+
+class Student {
+
+    private int m1, m2, m3;
+
+    // Static counter to track enrolled students
+    static int studentCount = 0;
+
+    // Static block to display welcome message
+    static {
+        System.out.println("Welcome to University Enrollment System");
+    }
+
+    // Constructor
+    Student(int m1, int m2, int m3) {
+        this.m1 = m1;
+        this.m2 = m2;
+        this.m3 = m3;
+        studentCount++;
+    }
+
+    // Non-static method to compute average of best two marks
+    void displayAverage() {
+        int bestTwoSum = m1 + m2 + m3 - Math.min(m1, Math.min(m2, m3));
+        double average = bestTwoSum / 2.0;
+        System.out.println("Average of best two marks: " + average);
+    }
+
+    // Static method to display total enrolled students
+    static void displayTotalStudents() {
+        System.out.println("Total students enrolled: " + studentCount);
+    }
+}
+
+public class UniversityEnrollment {
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        System.out.print("Enter number of students to enroll: ");
+        int n = sc.nextInt();
+
+        for (int i = 1; i <= n; i++) {
+            System.out.println("\nEnter marks for Student " + i);
+
+            System.out.print("Mark 1: ");
+            int m1 = sc.nextInt();
+
+            System.out.print("Mark 2: ");
+            int m2 = sc.nextInt();
+
+            System.out.print("Mark 3: ");
+            int m3 = sc.nextInt();
+
+            Student s = new Student(m1, m2, m3);
+            s.displayAverage();
+        }
+
+        // Display total enrolled students
+        Student.displayTotalStudents();
+
+        sc.close();
+    }
+}
diff --git a/point/MyPoint.class b/point/MyPoint.class
new file mode 100644
index 0000000000000000000000000000000000000000..f59db878e77e81bd8de261124d1c6c8edc2e60d6
GIT binary patch
literal 1287
zcmaJ=?M@R>5IwgaY+1G~Rz3v*wcxfzisDyNW1=O*CPhpjDB+JwyP*qZ7rPf?pTJk}
zE!0G#A;t&rp^WG5u2Quzn>%wq&YUwdoqqpu_6@)z+|v<5TtmV@5(5Im2iB=oZd>kt
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zvriU8G#!;`;};jj46`29T~XTX3$4ECopc)Znxj;W=zU3L&8|N7Jn74hb-ZrNme=%C
zD6+ApSez4u>;M*Z+`y8CvTD|{K>oZ~$3689?Q)o8*uOQaA-zsl;H}xywg?ysJh9wn
z+xGKy&pSLhuJpj7?)KdL5xCVow)?<$d+_00RC=2gQB<vVd()A2g$<~=uHC7&E#J3&
z4J!ik|J2kkRSkCpX8sRl=fb)$$8n2s$YT6BkHL<!N1x*2KttdXcPo4s^x5KPh+_N`
zG-c8scqK4Jn?r(@e*-n%{4&saPGY);AkLeRU`i28_aR7=Aj9x1?J(h&e-o6Lfg%_x
z_6g1ePb1VDrS2GEGnkE(i=<Sk=aOIbop|vhw2hqvU3%j^Z^P_WnP8!U4Y@+AN?wRc
z&ZrQDKT{d~9WzVhRa}c=?o&%8Ij3T#nxSo};AwTBZM}T+1taf>=~d1LEcu9Kl`QH<
zSyb^Qu7D`m1YF#u1G-?-pRp7$&PR;P%t}=_p%~Q)cvMFHqgRMuAU=lcFzHi_E^!rb
OlP8_KTeyw8nEVOb5dB*K

literal 0
HcmV?d00001

diff --git a/point/MyPoint.java b/point/MyPoint.java
new file mode 100644
index 0000000..295362b
--- /dev/null
+++ b/point/MyPoint.java
@@ -0,0 +1,53 @@
+class MyPoint {
+
+    private int x;
+    private int y;
+
+    // No-argument constructor
+    MyPoint() {
+        x = 0;
+        y = 0;
+    }
+
+    // Overloaded constructor
+    MyPoint(int x, int y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    // Set both x and y
+    void setXY(int x, int y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    // Return x and y as a 2-element array
+    int[] getXY() {
+        return new int[] { x, y };
+    }
+
+    // String representation
+    public String toString() {
+        return "(" + x + ", " + y + ")";
+    }
+
+    // Distance to given (x, y)
+    double distance(int x, int y) {
+        return Math.sqrt(
+            (this.x - x) * (this.x - x) + (this.y - y) * (this.y - y)
+        );
+    }
+
+    // Distance to another MyPoint object
+    double distance(MyPoint another) {
+        return Math.sqrt(
+            (this.x - another.x) * (this.x - another.x) +
+                (this.y - another.y) * (this.y - another.y)
+        );
+    }
+
+    // Distance to origin (0, 0)
+    double distance() {
+        return Math.sqrt(x * x + y * y);
+    }
+}
diff --git a/point/TestMyPoint.class b/point/TestMyPoint.class
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diff --git a/point/TestMyPoint.java b/point/TestMyPoint.java
new file mode 100644
index 0000000..c8f3da6
--- /dev/null
+++ b/point/TestMyPoint.java
@@ -0,0 +1,57 @@
+import java.util.Scanner;
+
+public class TestMyPoint {
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        // Test default constructor
+        MyPoint p1 = new MyPoint();
+        System.out.println("p1: " + p1);
+
+        // Test overloaded constructor
+        System.out.print("Enter x coordinate: ");
+        int x = sc.nextInt();
+        System.out.print("Enter y coordinate: ");
+        int y = sc.nextInt();
+
+        MyPoint p2 = new MyPoint(x, y);
+        System.out.println("p2: " + p2);
+
+        // Test setXY()
+        System.out.print("Enter new x for p1: ");
+        int x1 = sc.nextInt();
+        System.out.print("Enter new y for p1: ");
+        int y1 = sc.nextInt();
+
+        p1.setXY(x1, y1);
+        System.out.println("Updated p1: " + p1);
+
+        // Test getXY()
+        int[] coords = p1.getXY();
+        System.out.println("getXY(): (" + coords[0] + ", " + coords[1] + ")");
+
+        // Test distance() to origin
+        System.out.println("Distance from p1 to origin: " + p1.distance());
+
+        // Test distance(int x, int y)
+        System.out.print("Enter x of another point: ");
+        int x2 = sc.nextInt();
+        System.out.print("Enter y of another point: ");
+        int y2 = sc.nextInt();
+
+        System.out.println(
+            "Distance from p1 to (" +
+                x2 +
+                ", " +
+                y2 +
+                "): " +
+                p1.distance(x2, y2)
+        );
+
+        // Test distance(MyPoint another)
+        System.out.println("Distance from p1 to p2: " + p1.distance(p2));
+
+        sc.close();
+    }
+}