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IMEI Validator Using Java Swing

Posted by Santhosh Kumar Jayaraman Articles | Java July 04, 2012
This article covers how to create a simple IMEI validator application using Java Swing.
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Introduction

This document covers how to create a simple IMEI validator application using Java Swing.

IMEI Number

IMEI stands for International Mobile Equipment Identity. IMEI is used to identify a mobile device when it is connected to a network. Each GSM, CDMA or satellite mobiles have unique IMEI number. This number will be printed in the device inside the battery component. User can find his device IMEI number by calling "*#06#". IMEI is a 15 digit number and the last digit is called as "Check Digit" and it can be identified by using Luhn Algorithm.

Luhn Algorithm

Luhn Algorithm is also known as "Modulus 10" algorithm. It is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, National Provider Identifier numbers in US and Canadian Social Insurance Numbers. It was created by IBM scientist Hans Peter Luhn. Verification is done by validating check digit.

  1. Double the value of every second digit from the right end(first right will be check digit number).
  2. Add the individual digits comprising both the products from step (1) and unaffected digits in the original number.
  3. If the total modulo 10 is equal to 0, then the number is valid, else it is not valid.

A simple example: IMEI no of mobile-354557030810924

Step 1:

IMEI1.jpg

Step 2:

3+1+0+4+1+0+5+1+4+0+6+0+1+6+1+0+9+4+4=50

Step 3:

50%10=0. So above number is valid number.

Steps to develop application

  1. Open Eclipse and create new Java project.

    IMEI2.jpg

    IMEI3.jpg
     
  2. Name the project as ImeiValidator and click Finish.

    IMEI4.jpg
     
  3. Now open the Package Explorer and right-click on ImeiValidator.

    IMEI5.jpg
     
  4. Create a new class called Imeivalidator:

    IMEI6.jpg

    IMEI7.jpg
     
  5. Write the following code in the class:
     

    import javax.swing.*;

    import java.awt.BorderLayout;

    import java.awt.event.*;

     

    public class Imei {

          JFrame frame;

          JButton button;

          JTextField field;

          JLabel label;

          JLabel warninglabel;   

          Box panel;

         

          public static void main(String[] args) {

                Imei hl=new Imei();

                hl.gui();

          }

          public void gui(){

               

                panel = Box.createVerticalBox();

                frame=new JFrame();

                button=new JButton("Click");

                field=new JTextField(15);

                field.putClientProperty("JComponent.sizeVariant", "mini");

               

                label=new JLabel("Enter the IMEI Number");

                warninglabel=new JLabel("");

                //adding contents to frame

                panel.add(label);

                panel.add(field);

                panel.add(warninglabel);

                panel.add(button);

               

                frame.getContentPane().add(BorderLayout.NORTH,panel);

                frame.setVisible(true);

                frame.setSize(300,300);

               

                button.addActionListener(new buttonAction());

          }

          public class buttonAction implements ActionListener{

               public void actionPerformed(ActionEvent ev) {

                     int sum=0;

                     String ImeiNo=field.getText();

                     if (ImeiNo.length()!=15){

             warninglabel.setText("IMEI Number should contain 15 characters");

                     }else

                     {

                           boolean errorflag = false;

                           for(int i=0;i<=14;i++){

                                 //getting ascii value for each character

                                 char c=ImeiNo.charAt(i);

                                 int number=c;

      //Assigning number values to corrsponding Ascii value

                                 if (number<48 || number>57){

                               warninglabel.setText("Enter only numerals");

                                       errorflag = true;

                                       break;

                                 }else

                                 {

                                       switch(number){

                                       case 48: number=0;break;

                                       case 49: number=1;break;

                                       case 50: number=2;break;

                                       case 51: number=3;break;

                                       case 52: number =4;break;

                                       case 53:number =5;break;

                                       case 54:number=6;break;

                                       case 55:number=7;break;

                                       case 56:number=8;break;

                                       case 57:number=9;break;

                                       }

     //Double the even number and divide it by 10. add quotient and remainder

                                       if ((i+1)%2==0){

                                             number=number*2;

                                             number=number/10+number%10;

                                       }

                                       sum=sum+number;

                                 }

                           }

     // Check the error flag to avoid overWriting of Warning Lable

                           if(!errorflag){

                                 if(sum%10==0){

                                       warninglabel.setText("Valid");

                                 }

                                 else

                                 {

                                       warninglabel.setText("Invalid");

                                 }

                           }

                     }

               }    

          }          

    }             

                               
    IMEI8.jpg

     

  6. Now run the application using Run -> Run As -> Java Application.

    IMEI9.jpg
     
  7. The following window will be displayed:

    IMEI10.jpg
     
  8. Enter the IMEI number and click "Click" as shown below:

    IMEI11.jpg

References

  1. http://en.wikipedia.org/wiki/Luhn_algorithm
  2. http://en.wikipedia.org/wiki/International_Mobile_Equipment_Identity 

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