Conditional Constructs in Java

Chapter 8

Conditional Constructs in Java

Class 10 - Logix Kips ICSE Computer Applications with BlueJ

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Java Program: Time Conversion Table Using Menu

40. Write a menu driven program to display the following menu:

Conversion Table
============

Milliseconds to Seconds
Milliseconds to Minutes
Seconds to Milliseconds
Seconds to Minutes
Minutes to Milliseconds
Minutes to Seconds

For an incorrect choice, display an appropriate error message.

Hint: 1 second = 1000 milliseconds

Java

import java.util.Scanner;
 
public class TimeConversion {
    public static void main(String[] args) {
 
        // Title
        System.out.println("CONVERSION TABLE");
        System.out.println("================");
        System.out.println("1. Milliseconds to Seconds");
        System.out.println("2. Milliseconds to Minutes");
        System.out.println("3. Seconds to Milliseconds");
        System.out.println("4. Seconds to Minutes");
        System.out.println("5. Minutes to Milliseconds");
        System.out.println("6. Minutes to Seconds");
 
        Scanner sc = new Scanner(System.in);
 
        System.out.print("Enter your choice: ");
        int choice = sc.nextInt();
 
        double value, result;
 
        switch (choice) {
            case 1:
                System.out.print("Enter milliseconds: ");
                value = sc.nextDouble();
                result = value / 1000;
                System.out.println("Seconds = " + result);
                break;
 
            case 2:
                System.out.print("Enter milliseconds: ");
                value = sc.nextDouble();
                result = value / (1000 * 60);
                System.out.println("Minutes = " + result);
                break;
 
            case 3:
                System.out.print("Enter seconds: ");
                value = sc.nextDouble();
                result = value * 1000;
                System.out.println("Milliseconds = " + result);
                break;
 
            case 4:
                System.out.print("Enter seconds: ");
                value = sc.nextDouble();
                result = value / 60;
                System.out.println("Minutes = " + result);
                break;
 
            case 5:
                System.out.print("Enter minutes: ");
                value = sc.nextDouble();
                result = value * 60 * 1000;
                System.out.println("Milliseconds = " + result);
                break;
 
            case 6:
                System.out.print("Enter minutes: ");
                value = sc.nextDouble();
                result = value * 60;
                System.out.println("Seconds = " + result);
                break;
 
            default:
                System.out.println("Invalid choice! Please select between 1 and 6.");
        }
 
        sc.close();
    }
}

Output

Sample Output 

CONVERSION TABLE
================
1. Milliseconds to Seconds
2. Milliseconds to Minutes
3. Seconds to Milliseconds
4. Seconds to Minutes
5. Minutes to Milliseconds
6. Minutes to Seconds
Enter your choice: 1
Enter milliseconds: 5000
Seconds = 5.0

📝 Explanation

Menu is displayed using print statements
User selects conversion type
switch-case performs the selected conversion
Correct formula is applied based on the choice
An error message is shown for an invalid choice