Kilometer to Miles Converter in Java GUI

[mr6e6o0o]

In this tutorial, i will teach you how to create a program for converting kilometer to miles in java with GUI. It is necessary for java beginners to undergo and learn this simple program that i have made.

Now, let's start this tutorial!

1. Open JCreator or NetBeans and make a java program with a file name of kmToMiles.java.

2. Import javax.swing package. Hence we will use a GUI (Graphical User Interface) here like the inputting the kilometer.

1. import
   
   javax.swing.*
   
   ;
   
2. 
   
3. </
   
   java
   
4. 3
   
   . Declare
   
   your variables.
   
5. <
   
   java>
   
6. String
   
   kmStr;
   
7. double
   
   km;
   
8. double
   
   mi;
   

We will use kmStr as String as an inputbox, variable km for kilometer, and mi for miles.

4. Use variable kmStr as an InputDialogBox for inputting kilometer. And convert the input to double (hence we will input only number here) with the use of variable km.

1. kmStr =
   
   JOptionPane
   
   .showInputDialog
   
   (
   
   null
   
   , "Enter kilometers."
   
   )
   
   ;
   
2. km =
   
   Double
   
   .parseDouble
   
   (
   
   kmStr)
   
   ;
   

5. Create the code for formula. We all know that 1km is equivalent to 0.621 miles. So, we will use this formula and pass the value to mi variable.

1. mi =
   
   km *
   
   0.621
   
   ;
   

6. After computing, display the equivalent value of kilometers to miles using JOptionPane.showMessageDialog.

1. JOptionPane
   
   .showMessageDialog
   
   (
   
   null
   
   , km +
   
   " kilometers is "
   
2. +
   
   mi +
   
   " miles."
   
   )
   
   ;
   

Output:

Here's the full code of this tutorial:

1. import
   
   javax.swing.*
   
   ;
   
2. 
   
3. public
   
   class
   
   kmToMiles {
   
4. public
   
   static
   
   void
   
   main(
   
   String
   
   [
   
   ]
   
   args)
   
   {
   
5. 
   
6. String
   
   kmStr;
   
7. double
   
   km;
   
8. double
   
   mi;
   
9. 
   
10. //... Input
    
11. kmStr =
    
    JOptionPane
    
    .showInputDialog
    
    (
    
    null
    
    , "Enter kilometers."
    
    )
    
    ;
    
12. km =
    
    Double
    
    .parseDouble
    
    (
    
    kmStr)
    
    ;
    
13. 
    
14. //... Computation
    
15. mi =
    
    km *
    
    0.621
    
    ;
    
16. 
    
17. //... Output
    
18. JOptionPane
    
    .showMessageDialog
    
    (
    
    null
    
    , km +
    
    " kilometers is "
    
19. +
    
    mi +
    
    " miles."
    
    )
    
    ;
    
20. }
    
21. 
    
22. }
    

For more inquiries and need programmer for your thesis systems in any kind of programming languages, just contact my number below.

Best Regards,

Engr. Lyndon Bermoy
IT Instructor/System Developer/Android Developer/Freelance Programmer
Mobile: 09488225971
Landline: 826-9296
E-mail:[email protected]

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