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Java Program to convert distance in kilometers to miles?

Java Program to convert distance in kilometers to miles?

In this tutorial, we will learn to develop a Java program to convert distance from kilometers to miles. We will make use of the formulas below for conversion. The mathematical formula for converting distance from kilometers to miles:

Miles = 0.62 * ( Distance in kilometers)

The mathematical formula for converting distance from miles to kilometers:

Kilometers = 1.60 * (Distance in miles )

Tools used

Tools used to develop the program are as follows:

  • JDK
  • IntelliJ IDE

Convert Distance Java Program

The program allows users to input the two conversion options. The program checks for the options 1 and 2. It stops gracefully for any other input options.

import java.util.Scanner;

public class DistanceConverter {
 public static void main(String args[]) {
 Scanner input = null;
 double km,mi,distance;
 int option;
 try {
 input = new Scanner(System.in);
 System.out.println("Choose an Option:");
 System.out.println("Convert Kilometers to Miles(1)");
 System.out.println("Convert Miles to Kilometers(2)");
 option = Integer.parseInt(input.nextLine());
 if (option != 1 && option != 2)
 {
 System.out.println("Plz choose option 1 or 2");
 System.exit(0);
 }
 if(option == 1) {
 System.out.println("Enter Distance in Kilometers");
 distance = Double.parseDouble(input.nextLine());
 mi = 0.62 * distance;
 System.out.println("Distance in Miles is:" + mi );

 }
 else if(option == 2) {
 System.out.println("Enter Distance in Miles");
 distance = Double.parseDouble(input.nextLine());
 km = 1.60 * distance;
 System.out.println("Distance in Kilometers is:" + km );
 }
 }
 catch(Exception e)
 {
 System.out.print("Error.Program Terminated");
 }
 finally
 {
 if (input != null) {
 input.close();
 }
 }
 }
}

 

Output of the program

Distance converter java program

Test Cases

Execute some test cases to verify the program output. We will execute two test cases on the program.

Test Case 1-> To verify the conversion from Kilometers to Miles option.

Test Case 2-> To verify the conversion from Miles to Kilometers option.

Test Case 3 -> This is an invalid test case. To verify how the program responds for invalid user input.

Test Case #1

Choose an Option:
Convert Kilometers to Miles(1)
Convert Miles to Kilometers(2)
1
Enter Distance in Kilometers
10
Distance in Miles is:6.2

Test Case #2

Choose an Option:
Convert Kilometers to Miles(1)
Convert Miles to Kilometers(2)
2
Enter Distance in Miles
10
Distance in Kilometers is:16.0

Test Case #3

Choose an Option:
Convert Kilometers to Miles(1)
Convert Miles to Kilometers(2)
3
Plz choose option 1 or 2

 

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