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Product calculation

 import java.text.DecimalFormat; // Product excluding tax class class ProductExcludingTax {     private String productName;     private int quantity;     private double price;     private double taxRate; // Tax rate as a decimal (e.g., 0.1 for 10% tax)     // Constructor     public ProductExcludingTax(String productName, int quantity, double price, double taxRate) {         this.productName = productName;         this.quantity = quantity;         this.price = price;         this.taxRate = taxRate;     }     // Calculate total amount including tax     public double calculateTotalAmount() {         double totalAmount = quantity * price;         double taxAmount = totalAmount * taxRate;         return totalAmount + taxAmount;     }     // ...
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File operations

 import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; import java.util.Scanner; public class FileOperations {          public static void main(String[] args) {         Scanner scanner = new Scanner(System.in);         int choice;                  do {             System.out.println("\nFile Operations Menu:");             System.out.println("1. Create a File");             System.out.println("2. Update a File");             System.out.println("3. Delete a File");             System.out.println("4. Exit");             System.out.print("Enter your choice: ");             choice = scanner.nextI...
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