3 Programs

SaketJNU · SaketJNU · commit 606cfd5d3263 · 2025-05-21T13:56:27.000+05:30
diff --git a/ucer/4B4/BankDemo.java b/ucer/4B4/BankDemo.java
@@ -0,0 +1,90 @@
+class BankAccount {
+    protected String accountHolder;
+    protected double balance;
+
+    public BankAccount(String accountHolder, double balance) {
+        this.accountHolder = accountHolder;
+        this.balance = balance;
+    }
+
+    public void deposit(double amount) {
+        if (amount > 0) {
+            balance += amount;
+            System.out.println(amount + " deposited. New balance: " + balance);
+        } else {
+            System.out.println("Invalid deposit amount.");
+        }
+    }
+
+    public void withdraw(double amount) {
+        if (amount <= balance) {
+            balance -= amount;
+            System.out.println( amount + " withdrawn. New balance: " + balance);
+        } else {
+            System.out.println("Insufficient balance.");
+        }
+    }
+
+    public void displayBalance() {
+        System.out.println(accountHolder + "Balance: " + balance);
+    }
+}
+
+class SavingsAccount extends BankAccount {
+
+    public SavingsAccount(String accountHolder, double balance) {
+        super(accountHolder, balance);
+    }
+
+    @Override
+    public void withdraw(double amount) {
+        if (balance - amount < 100) {
+            System.out.println("Withdrawal denied. Balance cannot go below 100 in Savings Account.");
+        } else {
+            super.withdraw(amount);
+        }
+    }
+}
+
+class CurrentAccount extends BankAccount {
+    private final double overdraftLimit = 5000;
+
+    public CurrentAccount(String accountHolder, double balance) {
+        super(accountHolder, balance);
+    }
+
+    @Override
+    public void withdraw(double amount) {
+        if (balance - amount < -overdraftLimit) {
+            System.out.println("Withdrawal denied. Overdraft limit of 5000 exceeded in Current Account.");
+        } else {
+            balance -= amount;
+            System.out.println(amount + " withdrawn. New balance: " + balance);
+        }
+    }
+}
+
+public class BankDemo {
+    public static void main(String[] args) {
+        // Creating instances
+        SavingsAccount savings = new SavingsAccount("Alice", 1000);
+        CurrentAccount current = new CurrentAccount("Bob", 2000);
+
+        // Transactions on SavingsAccount
+        System.out.println("\n--- Savings Account Transactions ---");
+        savings.displayBalance();
+        savings.deposit(500);
+        savings.withdraw(1400); // Should fail
+        savings.withdraw(200);  // Should succeed
+        savings.displayBalance();
+
+        // Transactions on CurrentAccount
+        System.out.println("\n--- Current Account Transactions ---");
+        current.displayBalance();
+        current.withdraw(6000); // Should succeed (within overdraft)
+        current.withdraw(2000); // Should fail (overdraft exceeded)
+        current.deposit(3000);
+        current.displayBalance();
+    }
+}
+
diff --git a/ucer/4B4/VehicleTest.java b/ucer/4B4/VehicleTest.java
@@ -0,0 +1,69 @@
+// Abstract class Vehicle
+abstract class Vehicle {
+    protected String brand;
+
+    public Vehicle(String brand) {
+        this.brand = brand;
+    }
+
+    // Abstract method
+    public abstract void startEngine();
+}
+
+// Interface FuelType
+interface FuelType {
+    void fuelEfficiency();  // No body since it's an interface method
+}
+
+// Car class extending Vehicle and implementing FuelType
+class Car extends Vehicle implements FuelType {
+
+    public Car(String brand) {
+        super(brand);
+    }
+
+    @Override
+    public void startEngine() {
+        System.out.println(brand + " Car engine started with key ignition.");
+    }
+
+    @Override
+    public void fuelEfficiency() {
+        System.out.println(brand + " Car has fuel efficiency of 15 km/l.");
+    }
+}
+
+// Bike class extending Vehicle and implementing FuelType
+class Bike extends Vehicle implements FuelType {
+
+    public Bike(String brand) {
+        super(brand);
+    }
+
+    @Override
+    public void startEngine() {
+        System.out.println(brand + " Bike engine started with kick start.");
+    }
+
+    @Override
+    public void fuelEfficiency() {
+        System.out.println(brand + " Bike has fuel efficiency of 45 km/l.");
+    }
+}
+
+// Main class to test the implementation
+public class VehicleTest {
+    public static void main(String[] args) {
+        Car myCar = new Car("Toyota");
+        Bike myBike = new Bike("Honda");
+
+        System.out.println("--- Car ---");
+        myCar.startEngine();
+        myCar.fuelEfficiency();
+
+        System.out.println("\n--- Bike ---");
+        myBike.startEngine();
+        myBike.fuelEfficiency();
+    }
+}
+
diff --git a/ucer/4B4/hello.txt b/ucer/4B4/hello.txt
@@ -0,0 +1,3 @@
+This is a Java Programming Lab.
+We are learning file reading and writing.
+We are applying try-with-resource method.
diff --git a/ucer/4B4/readwrite.java b/ucer/4B4/readwrite.java
@@ -0,0 +1,27 @@
+// Java program for try-with-resources having multiple resources
+
+import java.io.*;
+
+class readwrite {
+    public static void main(String[] args)
+    {
+        try (FileOutputStream f
+             = new FileOutputStream("outputfile.txt");
+           BufferedReader br = new BufferedReader(
+                 new FileReader("hello.txt"))) {
+            String text;
+            while ((text = br.readLine()) != null) {
+                byte arr[] = text.getBytes();
+                f.write(arr);
+          }
+
+         System.out.println(
+                "File content copied to another one.");
+        }
+    catch (Exception e) {
+            System.out.println(e);
+        }
+       System.out.println(
+            "Resource are closed and message has been written into the file.");
+    }
+}

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+This is a Java Programming Lab.`
	`2`	`+We are learning file reading and writing.`
	`3`	`+We are applying try-with-resource method.`