Compute Square Root of a Number in Java GUI

[bagwis]

In this tutorial, you will learn how to compute a square root of a number using Java GUI using Math.sqrt function. We all know that square root are number that when multiplied by itself gives a given number.

Now let's start this tutorial!

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

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

1. import
   
   javax.swing.*
   
   ;
   

3. Initialize your variable in your Main, variable numInput as string and make it as an input and variable squareRoot as double that will hold the output value of our output when we inputted on the inputBox.

1. double
   
   squareRoot;
   
2. String
   
   numInput;
   
3. 
   
4. numInput =
   
   JOptionPane
   
   .showInputDialog
   
   (
   
   null
   
   , "Enter a number:"
   
   )
   
   ;
   
5. squareRoot =
   
   Double
   
   .parseDouble
   
   (
   
   numInput)
   
   ;
   

4. Have now your computation on how to get the square root using Math.sqrt function. Put this code below.

1. squareRoot =
   
   Math
   
   .sqrt
   
   (
   
   squareRoot)
   
   ;
   

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

1. JOptionPane
   
   .showMessageDialog
   
   (
   
   null
   
   , "Square Root is: "
   
   +
   
   squareRoot)
   
   ;
   

Output:

Here's the full code of this tutorial:

1. import
   
   javax.swing.*
   
   ;
   
2. 
   
3. public
   
   class
   
   sqrRoot {
   
4. 
   
5. 
   
6. public
   
   static
   
   void
   
   main(
   
   String
   
   [
   
   ]
   
   args)
   
   {
   
7. 
   
8. 
   
9. double
   
   squareRoot;
   
10. String
    
    numInput;
    
11. 
    
12. numInput =
    
    JOptionPane
    
    .showInputDialog
    
    (
    
    null
    
    , "Enter a number:"
    
    )
    
    ;
    
13. squareRoot =
    
    Double
    
    .parseDouble
    
    (
    
    numInput)
    
    ;
    
14. 
    
15. squareRoot =
    
    Math
    
    .sqrt
    
    (
    
    squareRoot)
    
    ;
    
16. JOptionPane
    
    .showMessageDialog
    
    (
    
    null
    
    , "Square Root is: "
    
    +
    
    squareRoot)
    
    ;
    
17. 
    
18. }
    
19. 
    
20. 
    
21. }
    

Hope this helps! :)

Best Regards,

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

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