In this tutorial, i will teach you how to create a program that converts an inputted decimal number into binary using Java GUI.

So, now let's start this tutorial!

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

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

1. import
   
   javax.swing.*
   
   ;
   

3. Initialize your variables in your Main, variable numInput as string and make it as an inputdialogbox. Variable n as integer that will parse the inputted value of numInput. And variable binary as integer that will hold the binary value of our input.

1. int
   
   n;
   
2. String
   
   numInput;
   
3. String
   
   binary;
   
4. numInput =
   
   JOptionPane
   
   .showInputDialog
   
   (
   
   null
   
   , "Enter a number:"
   
   )
   
   ;
   
5. n =
   
   Integer
   
   .parseInt
   
   (
   
   numInput)
   
   ;
   

4. Compute the equivalent binary value of the inputted decimal number.

1. binary =
   
   Integer
   
   .toBinaryString
   
   (
   
   n)
   
   ;
   

toBinaryString method converts any number into a binary value.

5. Lastly, display the output of the program using JOptionPane.showMessageDialog.

1. JOptionPane
   
   .showMessageDialog
   
   (
   
   null
   
   , "Binary equivalent is: "
   
   +
   
   binary)
   
   ;
   

Output:


Here's the full code of this tutorial:

1. import
   
   javax.swing.*
   
   ;
   
2. 
   
3. public
   
   class
   
   decToBinary {
   
4. 
   
5. 
   
6. public
   
   static
   
   void
   
   main(
   
   String
   
   [
   
   ]
   
   args)
   
   {
   
7. 
   
8. 
   
9. int
   
   n;
   
10. String
    
    numInput;
    
11. String
    
    binary;
    
12. numInput =
    
    JOptionPane
    
    .showInputDialog
    
    (
    
    null
    
    , "Enter a number:"
    
    )
    
    ;
    
13. n =
    
    Integer
    
    .parseInt
    
    (
    
    numInput)
    
    ;
    
14. 
    
15. binary =
    
    Integer
    
    .toBinaryString
    
    (
    
    n)
    
    ;
    
16. JOptionPane
    
    .showMessageDialog
    
    (
    
    null
    
    , "Binary equivalent is: "
    
    +
    
    binary)
    
    ;
    
17. }
    
18. 
    
19. }
    

Hope this program helps! :)

Best Regards,

Engr. Lyndon R. Bermoy
IT Instructor/System Developer/Android Developer/Freelance Programmer

If you have some queries, feel free to contact the number or e-mail below.
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